test: expand dsl/runner coverage and add go-test CI workflow

- Add dsl/matcher_test.go covering ExactMatcher, ContainsMatcher,
    RegexMatcher, NumericEpsMatcher, AnyOrderMatcher and NoMatcher —
    previously 0% — including epsilon, count mismatch, unparsable
    numbers, invalid regex, and splitLines edge cases.
  - Add dsl/ast_test.go for the new Test.SetInputFile / SetStdin /
    SetOutputFile / SetStdout helpers and Pattern.IsDirMode.
  - Add dsl/build_string_test.go covering BuildProfile.String,
    WarningLevel.String and BuildConfig.MergeFrom (wrapper, defines
    into nil map, defines override existing, nil src).
  - Add dsl/merge_test.go driving mergeFiles to 100%: legacy build
    fields, duplicate toolchain/build/group from include, binary /
    sources / normalize_crlf / trim_trailing_ws propagation, local
    overrides of timeout and memory_limit.
  - Add dsl/parser_features_test.go for parseTest / parseGroup happy
    paths that were missing: file/outFile, env, wrapper, per-test
    timeout/memory overrides, non-zero exitCode, scoring partial /
    all_or_none and unknown scoring.
  - Add dsl/parser_errors_test.go, a 54-case table-driven test that
    hits every `expect(...)` error branch in parseGroup and parseTest
    (missing LPAREN/RPAREN/LBRACE/RBRACE/ASSIGN, wrong token types on
    weight/timeout/memory_limit/scoring/env/wrapper/file/outFile, and
    unclosed blocks).
  - Add dsl/parser_misc_test.go covering parsePattern dir-mode with
    args, unknown pattern field, non-ident in pattern, top-level
    binary / sources / normalize_crlf / trim_trailing_ws / bare-int
    memory_limit, parseBool invalid ident and non-ident, matcher
    without an operator, validateBuilds legacy+structured conflict.
  - Add dsl/build_parser_test.go covering every BuildConfig field
    (sources, includes, sanitize, link, extra, platforms, compilers,
    defines), OS overrides on named builds, nested / duplicate OS
    override errors, unknown build / profile / warnings / platform,
    missing = on assign-string and assign-string-list, define(...)
    error cases, and parseToolchainsBlock (duplicate name, missing
    platforms, bad name token, unknown field, unknown compiler class,
    binary and class propagation).
  - Add dsl/lexer_test.go for Token.String, TokenType.String UNKNOWN
    branch, line comments, unterminated string and heredoc, unknown
    escape sequence, escape decoding, unexpected character, every
    K/M/G/KiB/MiB/GiB size suffix, ms/s/m duration suffixes, negative
    integer lexing and float literals.
  - Extend runner/result_test.go with Status.String and
    TestResult.addFailure (both previously 0%).
  - Add .gitea/workflows/go-test.yml running `go vet` and
    `go test -race -coverprofile=coverage.out ./...` on push,
    pull_request and manual dispatch, uploading coverage.out as an
    artifact.

  Coverage: dsl 60.5% -> 85%+, runner 29.0% -> 30.5%.

.gitea/workflows/go-test.yml

@@ -0,0 +1,36 @@
+name: go-test
+run-name: "Go unit tests"
+
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  test:
+    name: go test
+    runs-on: Linux-Runner
+    timeout-minutes: 10
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '1.26'
+
+      - name: go vet
+        run: go vet ./...
+
+      - name: go test
+        run: go test -race -coverprofile=coverage.out ./...
+
+      - name: Coverage summary
+        run: go tool cover -func=coverage.out | tail -20
+
+      - name: Upload coverage
+        if: ${{ always() }}
+        uses: https://github.com/christopherHX/gitea-upload-artifact@v4
+        with:
+          name: coverage
+          path: coverage.out
+          retention-days: 7

dsl/ast_test.go

@@ -0,0 +1,75 @@
+package dsl
+
+import "testing"
+
+func newTest() *Test {
+	return &Test{
+		InFiles:  map[string]string{},
+		OutFiles: map[string]string{},
+	}
+}
+
+func TestSetInputFile(t *testing.T) {
+	tst := newTest()
+	tst.SetInputFile("input.txt", []byte("hello"))
+	if got := tst.InFiles["input.txt"]; got != "hello" {
+		t.Errorf("InFiles[input.txt] = %q, want %q", got, "hello")
+	}
+	if tst.Stdin != nil {
+		t.Errorf("Stdin should remain nil, got %v", *tst.Stdin)
+	}
+}
+
+func TestSetStdin(t *testing.T) {
+	tst := newTest()
+	tst.SetStdin([]byte("data\n"))
+	if tst.Stdin == nil {
+		t.Fatal("Stdin is nil")
+	}
+	if *tst.Stdin != "data\n" {
+		t.Errorf("Stdin = %q, want %q", *tst.Stdin, "data\n")
+	}
+	if len(tst.InFiles) != 0 {
+		t.Errorf("InFiles should be empty, got %v", tst.InFiles)
+	}
+}
+
+func TestSetOutputFileSetsNoMatcher(t *testing.T) {
+	tst := newTest()
+	tst.SetOutputFile("out.txt", []byte("result"))
+	if got := tst.OutFiles["out.txt"]; got != "result" {
+		t.Errorf("OutFiles[out.txt] = %q, want %q", got, "result")
+	}
+	if _, ok := tst.Stdout.(NoMatcher); !ok {
+		t.Errorf("Stdout = %T, want NoMatcher", tst.Stdout)
+	}
+}
+
+func TestSetStdoutSetsExactMatcher(t *testing.T) {
+	tst := newTest()
+	tst.SetStdout([]byte("expected\n"))
+	m, ok := tst.Stdout.(ExactMatcher)
+	if !ok {
+		t.Fatalf("Stdout = %T, want ExactMatcher", tst.Stdout)
+	}
+	if m.Value != "expected\n" {
+		t.Errorf("ExactMatcher.Value = %q, want %q", m.Value, "expected\n")
+	}
+	if len(tst.OutFiles) != 0 {
+		t.Errorf("OutFiles should be empty, got %v", tst.OutFiles)
+	}
+}
+
+func TestIsDirModeTrue(t *testing.T) {
+	p := &Pattern{DirsGlob: "tests/*"}
+	if !p.IsDirMode() {
+		t.Error("IsDirMode() = false, want true")
+	}
+}
+
+func TestIsDirModeFalse(t *testing.T) {
+	p := &Pattern{InputGlob: "tests/*.in"}
+	if p.IsDirMode() {
+		t.Error("IsDirMode() = true, want false")
+	}
+}

dsl/build_parser_test.go

@@ -0,0 +1,379 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+)
+
+const buildDefaultsPrefix = `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "*.c"
+    output   = "sol"
+    warnings = strict
+}
+`
+
+func TestBuildAllFieldsParsed(t *testing.T) {
+	src := `
+build_defaults {
+    language = "cpp"
+    standard = "c++17"
+    sources  = "a.cpp" "b.cpp"
+    includes = "inc" "inc2"
+    output   = "sol"
+    warnings = pedantic
+    wrapper  = "timeout"
+    sanitize = "address" "undefined"
+    link     = "-lm"
+    extra    = "-g"
+    platforms = "linux" "darwin"
+    compilers = "gcc" "clang"
+    define("DEBUG") = "1"
+    define("VERSION") = "2"
+}
+
+build "release" {
+    profile = release
+}
+
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	bd := f.BuildDefaults
+	if bd == nil {
+		t.Fatal("no build_defaults")
+	}
+	if bd.Language != "cpp" || bd.Standard != "c++17" || bd.Output != "sol" {
+		t.Errorf("basic fields wrong: %+v", bd)
+	}
+	if bd.Warnings != WarningsPedantic {
+		t.Errorf("Warnings = %v", bd.Warnings)
+	}
+	if bd.Wrapper != "timeout" {
+		t.Errorf("Wrapper = %q", bd.Wrapper)
+	}
+	if len(bd.Sources) != 2 || len(bd.Includes) != 2 || len(bd.Sanitize) != 2 {
+		t.Errorf("lists: sources=%v includes=%v sanitize=%v", bd.Sources, bd.Includes, bd.Sanitize)
+	}
+	if len(bd.Link) != 1 || len(bd.Extra) != 1 {
+		t.Errorf("link/extra: %v / %v", bd.Link, bd.Extra)
+	}
+	if len(bd.Platforms) != 2 || len(bd.Compilers) != 2 {
+		t.Errorf("platforms/compilers: %v / %v", bd.Platforms, bd.Compilers)
+	}
+	if bd.Defines["DEBUG"] != "1" || bd.Defines["VERSION"] != "2" {
+		t.Errorf("Defines = %v", bd.Defines)
+	}
+}
+
+func TestBuildOSOverrides(t *testing.T) {
+	src := `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "main.c"
+    output   = "sol"
+    warnings = strict
+}
+
+build "release" {
+    profile = release
+    linux   { extra = "-pthread" }
+    windows { extra = "/MT" }
+    darwin  { extra = "-framework CoreFoundation" }
+}
+
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	b := f.Builds[0]
+	if b.Linux == nil || b.Windows == nil || b.Darwin == nil {
+		t.Errorf("OS overrides missing: %+v", b)
+	}
+}
+
+func TestBuildOSNestedForbidden(t *testing.T) {
+	src := buildDefaultsPrefix + `
+build "r" {
+    profile = release
+    linux {
+        darwin { extra = "-x" }
+    }
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "nested inside another OS override") {
+		t.Errorf("want nested OS override error, got %v", err)
+	}
+}
+
+func TestBuildDuplicateOSOverride(t *testing.T) {
+	src := buildDefaultsPrefix + `
+build "r" {
+    profile = release
+    linux { extra = "-a" }
+    linux { extra = "-b" }
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "duplicate linux override") {
+		t.Errorf("want duplicate linux override, got %v", err)
+	}
+}
+
+func TestBuildUnknownField(t *testing.T) {
+	src := `
+build_defaults {
+    bogus = "x"
+    language = "c"
+    standard = "c11"
+    sources  = "main.c"
+    output   = "sol"
+    warnings = strict
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown field") {
+		t.Errorf("want unknown field error, got %v", err)
+	}
+}
+
+func TestBuildUnknownProfile(t *testing.T) {
+	src := `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "main.c"
+    output   = "sol"
+    warnings = strict
+}
+build "weird" { profile = bogus }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown profile") {
+		t.Errorf("want unknown profile error, got %v", err)
+	}
+}
+
+func TestBuildUnknownWarnings(t *testing.T) {
+	src := `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "main.c"
+    output   = "sol"
+    warnings = bogus
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown warnings level") {
+		t.Errorf("want unknown warnings error, got %v", err)
+	}
+}
+
+func TestBuildWarningsDefaultAndStrict(t *testing.T) {
+	src := `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "main.c"
+    output   = "sol"
+    warnings = default
+}
+build "r" {
+    warnings = strict
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.BuildDefaults.Warnings != WarningsDefault {
+		t.Errorf("defaults warnings = %v", f.BuildDefaults.Warnings)
+	}
+	if f.Builds[0].Warnings != WarningsStrict {
+		t.Errorf("build warnings = %v", f.Builds[0].Warnings)
+	}
+}
+
+func TestBuildInvalidPlatform(t *testing.T) {
+	src := buildDefaultsPrefix + `
+build "r" {
+    profile = release
+    platforms = "bsd"
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown platform") {
+		t.Errorf("want unknown platform error, got %v", err)
+	}
+}
+
+func TestBuildAssignStringMissingAssign(t *testing.T) {
+	src := `
+build_defaults {
+    language "c"
+    standard = "c11"
+    sources  = "main.c"
+    output   = "sol"
+    warnings = strict
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "expected") {
+		t.Errorf("want expected = error, got %v", err)
+	}
+}
+
+func TestBuildAssignStringListMissingAssign(t *testing.T) {
+	src := `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  "main.c"
+    output   = "sol"
+    warnings = strict
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "expected") {
+		t.Errorf("want expected = error, got %v", err)
+	}
+}
+
+func TestBuildDefineErrors(t *testing.T) {
+	cases := []string{
+		`build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict define "K" = "v" }`,
+		`build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict define(K) = "v" }`,
+		`build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict define("K" = "v" }`,
+		`build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict define("K") "v" }`,
+		`build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict define("K") = K }`,
+	}
+	for i, src := range cases {
+		full := src + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }"
+		if _, _, err := Parse(full); err == nil {
+			t.Errorf("case %d: expected error", i)
+		}
+	}
+}
+
+func TestBuildNonIdentInBlock(t *testing.T) {
+	src := `
+build_defaults { "not-an-ident" = "x" }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unexpected token") {
+		t.Errorf("want unexpected token error, got %v", err)
+	}
+}
+
+func TestToolchainsDuplicateInSameBlock(t *testing.T) {
+	src := `
+toolchains {
+    gcc { platforms = "linux" }
+    gcc { platforms = "darwin" }
+}
+build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "duplicate toolchain") {
+		t.Errorf("want duplicate toolchain error, got %v", err)
+	}
+}
+
+func TestToolchainsMissingPlatforms(t *testing.T) {
+	src := `
+toolchains {
+    gcc { binary = "gcc-13" }
+}
+build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "platforms is required") {
+		t.Errorf("want platforms-required error, got %v", err)
+	}
+}
+
+func TestToolchainsBadName(t *testing.T) {
+	src := `
+toolchains {
+    42 { platforms = "linux" }
+}
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "expected toolchain name") {
+		t.Errorf("want toolchain name error, got %v", err)
+	}
+}
+
+func TestToolchainsUnknownField(t *testing.T) {
+	src := `
+toolchains {
+    gcc { platforms = "linux" bogus = "x" }
+}
+build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown field") {
+		t.Errorf("want unknown field error, got %v", err)
+	}
+}
+
+func TestToolchainsUnknownClass(t *testing.T) {
+	src := `
+toolchains {
+    gcc { platforms = "linux" class = bogus }
+}
+build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown compiler class") {
+		t.Errorf("want unknown class error, got %v", err)
+	}
+}
+
+func TestToolchainsClassAndBinary(t *testing.T) {
+	src := `
+toolchains {
+    gcc13 { platforms = "linux" binary = "gcc-13" class = gnu }
+    msvc { platforms = "windows" class = msvc }
+}
+build_defaults { language="c" standard="c11" sources="x.c" output="s" warnings=strict }
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if len(f.Toolchains) != 2 {
+		t.Fatalf("toolchains = %d", len(f.Toolchains))
+	}
+	if f.Toolchains[0].Binary != "gcc-13" || f.Toolchains[0].Class != "gnu" {
+		t.Errorf("gcc13 = %+v", f.Toolchains[0])
+	}
+	if f.Toolchains[1].Class != "msvc" {
+		t.Errorf("msvc class = %q", f.Toolchains[1].Class)
+	}
+}

dsl/build_string_test.go

@@ -0,0 +1,74 @@
+package dsl
+
+import "testing"
+
+func TestBuildProfileString(t *testing.T) {
+	cases := []struct {
+		p    BuildProfile
+		want string
+	}{
+		{ProfileRelease, "release"},
+		{ProfileDebug, "debug"},
+		{ProfileSanitized, "sanitized"},
+		{ProfileUnset, "unset"},
+		{BuildProfile(999), "unset"},
+	}
+	for _, c := range cases {
+		if got := c.p.String(); got != c.want {
+			t.Errorf("BuildProfile(%d).String() = %q, want %q", c.p, got, c.want)
+		}
+	}
+}
+
+func TestWarningLevelString(t *testing.T) {
+	cases := []struct {
+		w    WarningLevel
+		want string
+	}{
+		{WarningsDefault, "default"},
+		{WarningsStrict, "strict"},
+		{WarningsPedantic, "pedantic"},
+		{WarningsUnset, "unset"},
+		{WarningLevel(999), "unset"},
+	}
+	for _, c := range cases {
+		if got := c.w.String(); got != c.want {
+			t.Errorf("WarningLevel(%d).String() = %q, want %q", c.w, got, c.want)
+		}
+	}
+}
+
+func TestMergeFromWrapperAndDefines(t *testing.T) {
+	dst := &BuildConfig{}
+	src := &BuildConfig{
+		Wrapper: "valgrind",
+		Defines: map[string]string{"DEBUG": "1", "VERSION": "2"},
+	}
+	dst.MergeFrom(src)
+	if dst.Wrapper != "valgrind" {
+		t.Errorf("Wrapper = %q, want valgrind", dst.Wrapper)
+	}
+	if dst.Defines["DEBUG"] != "1" || dst.Defines["VERSION"] != "2" {
+		t.Errorf("Defines = %v", dst.Defines)
+	}
+}
+
+func TestMergeFromDefinesIntoExisting(t *testing.T) {
+	dst := &BuildConfig{Defines: map[string]string{"KEEP": "old"}}
+	src := &BuildConfig{Defines: map[string]string{"NEW": "1", "KEEP": "new"}}
+	dst.MergeFrom(src)
+	if dst.Defines["KEEP"] != "new" {
+		t.Errorf("KEEP = %q, want new (overridden)", dst.Defines["KEEP"])
+	}
+	if dst.Defines["NEW"] != "1" {
+		t.Errorf("NEW = %q, want 1", dst.Defines["NEW"])
+	}
+}
+
+func TestMergeFromNilSrc(t *testing.T) {
+	dst := &BuildConfig{Language: "c"}
+	dst.MergeFrom(nil)
+	if dst.Language != "c" {
+		t.Errorf("dst mutated on nil merge: %+v", dst)
+	}
+}

dsl/lexer_test.go

@@ -0,0 +1,175 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestTokenStringAndUnknownType(t *testing.T) {
+	tok := Token{Type: TOKEN_IDENT, Value: "foo", Line: 2, Col: 5}
+	s := tok.String()
+	if !strings.Contains(s, "IDENT") || !strings.Contains(s, "foo") {
+		t.Errorf("Token.String() = %q", s)
+	}
+	if got := TokenType(999).String(); got != "UNKNOWN" {
+		t.Errorf("TokenType(999).String() = %q, want UNKNOWN", got)
+	}
+	for tt, want := range map[TokenType]string{
+		TOKEN_STRING:   "STRING",
+		TOKEN_FLOAT:    "FLOAT",
+		TOKEN_INT:      "INT",
+		TOKEN_DURATION: "DURATION",
+		TOKEN_SIZE:     "SIZE",
+		TOKEN_LBRACE:   "{",
+		TOKEN_RBRACE:   "}",
+		TOKEN_LPAREN:   "(",
+		TOKEN_RPAREN:   ")",
+		TOKEN_ASSIGN:   "=",
+		TOKEN_TILDE:    "~",
+		TOKEN_EOF:      "EOF",
+	} {
+		if got := tt.String(); got != want {
+			t.Errorf("TokenType(%d) = %q, want %q", tt, got, want)
+		}
+	}
+}
+
+func TestLexerLineComment(t *testing.T) {
+	src := `
+// leading comment
+build "make" // trailing
+group("g") { // inside
+    weight = 1.0
+    test("t") { stdout = "" }
+}
+`
+	if _, _, err := Parse(src); err != nil {
+		t.Errorf("parse with comments: %v", err)
+	}
+}
+
+func TestLexerUnterminatedString(t *testing.T) {
+	_, _, err := Parse(`build "unterminated`)
+	if err == nil || !strings.Contains(err.Error(), "unterminated") {
+		t.Errorf("want unterminated string error, got %v", err)
+	}
+}
+
+func TestLexerUnknownEscape(t *testing.T) {
+	_, _, err := Parse(`build "bad\zescape"`)
+	if err == nil || !strings.Contains(err.Error(), "unknown escape") {
+		t.Errorf("want unknown escape error, got %v", err)
+	}
+}
+
+func TestLexerEscapeSequences(t *testing.T) {
+	src := `build "a\nb\tc\\d\"e"`
+	f, _, err := Parse(src + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }")
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.Build != "a\nb\tc\\d\"e" {
+		t.Errorf("escape sequences = %q", f.Build)
+	}
+}
+
+func TestLexerUnexpectedCharacter(t *testing.T) {
+	_, _, err := Parse("build @invalid")
+	if err == nil || !strings.Contains(err.Error(), "unexpected character") {
+		t.Errorf("want unexpected character error, got %v", err)
+	}
+}
+
+func TestLexerUnterminatedHeredoc(t *testing.T) {
+	src := "build \"x\"\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdin = \"\"\"\nnever closed\n } }"
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unterminated heredoc") {
+		t.Errorf("want unterminated heredoc, got %v", err)
+	}
+}
+
+func TestLexerSizeSuffixes(t *testing.T) {
+	cases := map[string]int64{
+		"1024":    1024,
+		"1B":      1,
+		"1K":      1024,
+		"1KB":     1024,
+		"1KiB":    1024,
+		"1M":      1024 * 1024,
+		"1MB":     1024 * 1024,
+		"1MiB":    1024 * 1024,
+		"1G":      1024 * 1024 * 1024,
+		"1GB":     1024 * 1024 * 1024,
+		"1GiB":    1024 * 1024 * 1024,
+	}
+	for literal, want := range cases {
+		src := "build \"x\"\nmemory_limit = " + literal + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }"
+		f, _, err := Parse(src)
+		if err != nil {
+			t.Errorf("parse %q: %v", literal, err)
+			continue
+		}
+		if f.MemoryLimit != want {
+			t.Errorf("memory_limit %s = %d, want %d", literal, f.MemoryLimit, want)
+		}
+	}
+}
+
+func TestLexerDurationSuffixes(t *testing.T) {
+	cases := []string{"5ms", "10s", "2m"}
+	for _, d := range cases {
+		src := "build \"x\"\ntimeout " + d + "\ngroup(\"g\") { weight = 1.0 test(\"t\") { stdout = \"\" } }"
+		if _, _, err := Parse(src); err != nil {
+			t.Errorf("parse timeout %s: %v", d, err)
+		}
+	}
+}
+
+func TestLexerNegativeInt(t *testing.T) {
+	src := `
+build "x"
+group("g") {
+    weight = 1.0
+    test("t") {
+        exitCode = -1
+        stdout = ""
+    }
+}
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	tst := f.Groups[0].Tests[0]
+	if tst.ExitCode == nil || *tst.ExitCode != -1 {
+		t.Errorf("ExitCode = %v, want -1", tst.ExitCode)
+	}
+}
+
+func TestLexerFloatNumber(t *testing.T) {
+	src := `
+build "x"
+group("g") {
+    weight = 0.75
+    test("t") { stdout = "" }
+}
+group("g2") {
+    weight = 0.25
+    test("t") { stdout = "" }
+}
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.Groups[0].Weight != 0.75 {
+		t.Errorf("weight = %v", f.Groups[0].Weight)
+	}
+}
+
+func TestLexerInvalidSizeUnit(t *testing.T) {
+	_, _, err := Parse("build \"x\"\nmemory_limit = 10Z\n")
+	if err == nil {
+		t.Error("expected error for invalid size unit")
+	}
+}

dsl/matcher_test.go

@@ -0,0 +1,187 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestExactMatcherPass(t *testing.T) {
+	m := ExactMatcher{Value: "hello\n"}
+	if errs := m.Match("stdout", "hello\n"); errs != nil {
+		t.Errorf("expected pass, got %v", errs)
+	}
+}
+
+func TestExactMatcherMismatch(t *testing.T) {
+	m := ExactMatcher{Value: "hello\n"}
+	errs := m.Match("stdout", "world\n")
+	if len(errs) != 1 {
+		t.Fatalf("want 1 error, got %d: %v", len(errs), errs)
+	}
+	if !strings.Contains(errs[0], "stdout mismatch") {
+		t.Errorf("error missing label: %q", errs[0])
+	}
+	if !strings.Contains(errs[0], "hello") || !strings.Contains(errs[0], "world") {
+		t.Errorf("error missing values: %q", errs[0])
+	}
+}
+
+func TestContainsMatcherPass(t *testing.T) {
+	m := ContainsMatcher{Substr: "needle"}
+	if errs := m.Match("stdout", "haystack with a needle inside"); errs != nil {
+		t.Errorf("expected pass, got %v", errs)
+	}
+}
+
+func TestContainsMatcherMissing(t *testing.T) {
+	m := ContainsMatcher{Substr: "needle"}
+	errs := m.Match("stdout", "only hay here")
+	if len(errs) != 1 {
+		t.Fatalf("want 1 error, got %d: %v", len(errs), errs)
+	}
+	if !strings.Contains(errs[0], "needle") {
+		t.Errorf("error missing substring: %q", errs[0])
+	}
+}
+
+func TestRegexMatcherPass(t *testing.T) {
+	m := RegexMatcher{Pattern: `^hello .*!$`}
+	if errs := m.Match("stdout", "hello world!"); errs != nil {
+		t.Errorf("expected pass, got %v", errs)
+	}
+}
+
+func TestRegexMatcherMismatch(t *testing.T) {
+	m := RegexMatcher{Pattern: `^\d+$`}
+	errs := m.Match("stdout", "not-a-number")
+	if len(errs) != 1 {
+		t.Fatalf("want 1 error, got %d: %v", len(errs), errs)
+	}
+	if !strings.Contains(errs[0], "does not match") {
+		t.Errorf("error unexpected: %q", errs[0])
+	}
+}
+
+func TestRegexMatcherInvalidPattern(t *testing.T) {
+	m := RegexMatcher{Pattern: `[`}
+	errs := m.Match("stdout", "anything")
+	if len(errs) != 1 {
+		t.Fatalf("want 1 error, got %d: %v", len(errs), errs)
+	}
+	if !strings.Contains(errs[0], "invalid regex") {
+		t.Errorf("error unexpected: %q", errs[0])
+	}
+}
+
+func TestNumericEpsMatcherPassWithinEps(t *testing.T) {
+	m := NumericEpsMatcher{Epsilon: 0.01, Value: "1.0 2.0 3.0"}
+	if errs := m.Match("stdout", "1.005 1.999 3.0"); errs != nil {
+		t.Errorf("expected pass, got %v", errs)
+	}
+}
+
+func TestNumericEpsMatcherExceedsEps(t *testing.T) {
+	m := NumericEpsMatcher{Epsilon: 0.01, Value: "1.0 2.0"}
+	errs := m.Match("stdout", "1.0 2.5")
+	if len(errs) != 1 {
+		t.Fatalf("want 1 error, got %d: %v", len(errs), errs)
+	}
+	if !strings.Contains(errs[0], "number[1]") {
+		t.Errorf("error missing index: %q", errs[0])
+	}
+}
+
+func TestNumericEpsMatcherCountMismatch(t *testing.T) {
+	m := NumericEpsMatcher{Epsilon: 0.01, Value: "1 2 3"}
+	errs := m.Match("stdout", "1 2")
+	if len(errs) != 1 {
+		t.Fatalf("want 1 error, got %d: %v", len(errs), errs)
+	}
+	if !strings.Contains(errs[0], "expected 3 numbers, got 2") {
+		t.Errorf("error unexpected: %q", errs[0])
+	}
+}
+
+func TestNumericEpsMatcherBadExpected(t *testing.T) {
+	m := NumericEpsMatcher{Epsilon: 0.01, Value: "1 foo"}
+	errs := m.Match("stdout", "1 2")
+	if len(errs) != 1 || !strings.Contains(errs[0], "cannot parse expected") {
+		t.Errorf("want expected-parse error, got %v", errs)
+	}
+}
+
+func TestNumericEpsMatcherBadActual(t *testing.T) {
+	m := NumericEpsMatcher{Epsilon: 0.01, Value: "1 2"}
+	errs := m.Match("stdout", "1 bar")
+	if len(errs) != 1 || !strings.Contains(errs[0], "cannot parse actual") {
+		t.Errorf("want actual-parse error, got %v", errs)
+	}
+}
+
+func TestNumericEpsMatcherMultipleErrors(t *testing.T) {
+	m := NumericEpsMatcher{Epsilon: 0.01, Value: "1 2 3"}
+	errs := m.Match("stdout", "9 8 7")
+	if len(errs) != 3 {
+		t.Errorf("want 3 errors, got %d: %v", len(errs), errs)
+	}
+}
+
+func TestAnyOrderMatcherPassReordered(t *testing.T) {
+	m := AnyOrderMatcher{Lines: []string{"a", "b", "c"}}
+	if errs := m.Match("stdout", "c\nb\na\n"); errs != nil {
+		t.Errorf("expected pass, got %v", errs)
+	}
+}
+
+func TestAnyOrderMatcherPassNoTrailingNewline(t *testing.T) {
+	m := AnyOrderMatcher{Lines: []string{"x", "y"}}
+	if errs := m.Match("stdout", "y\nx"); errs != nil {
+		t.Errorf("expected pass, got %v", errs)
+	}
+}
+
+func TestAnyOrderMatcherCountMismatch(t *testing.T) {
+	m := AnyOrderMatcher{Lines: []string{"a", "b"}}
+	errs := m.Match("stdout", "a\nb\nc\n")
+	if len(errs) != 1 || !strings.Contains(errs[0], "expected 2 lines, got 3") {
+		t.Errorf("want count error, got %v", errs)
+	}
+}
+
+func TestAnyOrderMatcherLineMismatch(t *testing.T) {
+	m := AnyOrderMatcher{Lines: []string{"a", "b"}}
+	errs := m.Match("stdout", "a\nz\n")
+	if len(errs) != 1 || !strings.Contains(errs[0], "line mismatch") {
+		t.Errorf("want line mismatch, got %v", errs)
+	}
+}
+
+func TestAnyOrderMatcherEmptyBoth(t *testing.T) {
+	m := AnyOrderMatcher{Lines: []string{}}
+	if errs := m.Match("stdout", ""); errs != nil {
+		t.Errorf("expected pass on empty, got %v", errs)
+	}
+}
+
+func TestNoMatcherAlwaysPasses(t *testing.T) {
+	m := NoMatcher{}
+	if errs := m.Match("stdout", "anything at all\n"); errs != nil {
+		t.Errorf("NoMatcher should never fail, got %v", errs)
+	}
+	if errs := m.Match("stderr", ""); errs != nil {
+		t.Errorf("NoMatcher should never fail on empty, got %v", errs)
+	}
+}
+
+func TestSplitLinesEmpty(t *testing.T) {
+	if got := splitLines(""); len(got) != 0 {
+		t.Errorf("splitLines(\"\") = %v, want empty", got)
+	}
+}
+
+func TestSplitLinesTrailingNewline(t *testing.T) {
+	got := splitLines("a\nb\n")
+	if len(got) != 2 || got[0] != "a" || got[1] != "b" {
+		t.Errorf("splitLines trailing = %v, want [a b]", got)
+	}
+}

dsl/merge_test.go

@@ -0,0 +1,220 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func TestMergeLegacyBuildFields(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+build         "make"
+build_linux   "make linux"
+build_windows "make windows"
+build_darwin  "make darwin"
+timeout 7s
+memory_limit = 256MB
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+include "common.jdg"
+group("g") { weight = 1.0 test("t") { stdout = "ok\n" } }
+`)
+	f, _, err := ParseFile(mainPath)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.Build != "make" || f.BuildLinux != "make linux" ||
+		f.BuildWindows != "make windows" || f.BuildDarwin != "make darwin" {
+		t.Errorf("legacy build fields not merged: %+v", f)
+	}
+	if f.Timeout != 7*time.Second {
+		t.Errorf("Timeout = %v, want 7s", f.Timeout)
+	}
+	if f.MemoryLimit != 256*1024*1024 {
+		t.Errorf("MemoryLimit = %d", f.MemoryLimit)
+	}
+}
+
+func TestMergeDuplicateToolchainFromInclude(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+toolchains {
+    gcc { platforms = "linux" }
+}
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+toolchains {
+    gcc { platforms = "linux" }
+}
+include "common.jdg"
+build "make"
+group("g") { weight = 1.0 test("t") { stdout = "ok\n" } }
+`)
+	_, _, err := ParseFile(mainPath)
+	if err == nil {
+		t.Fatal("expected duplicate toolchain error from merge")
+	}
+	if !strings.Contains(err.Error(), "duplicate toolchain") {
+		t.Errorf("error %q does not mention duplicate toolchain", err.Error())
+	}
+}
+
+func TestMergeDuplicateBuildErrors(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+build "release" { profile = release }
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "*.c"
+    output   = "solution"
+    warnings = strict
+}
+build "release" { profile = debug }
+include "common.jdg"
+group("g") { weight = 1.0 test("t") { stdout = "ok\n" } }
+`)
+	_, _, err := ParseFile(mainPath)
+	if err == nil {
+		t.Fatal("expected duplicate build error")
+	}
+	if !strings.Contains(err.Error(), "duplicate build") {
+		t.Errorf("error %q does not mention duplicate build", err.Error())
+	}
+}
+
+func TestMergeDuplicateGroupErrors(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+group("shared") { weight = 0.5 test("t") { stdout = "ok\n" } }
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+build "make"
+group("shared") { weight = 0.5 test("t2") { stdout = "ok\n" } }
+include "common.jdg"
+`)
+	_, _, err := ParseFile(mainPath)
+	if err == nil {
+		t.Fatal("expected duplicate group error")
+	}
+	if !strings.Contains(err.Error(), "duplicate group") {
+		t.Errorf("error %q does not mention duplicate group", err.Error())
+	}
+}
+
+func TestMergeGroupsAppended(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+build "make"
+group("included") { weight = 0.5 test("t") { stdout = "ok\n" } }
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+include "common.jdg"
+group("local") { weight = 0.5 test("t") { stdout = "ok\n" } }
+`)
+	f, _, err := ParseFile(mainPath)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if len(f.Groups) != 2 {
+		t.Fatalf("want 2 groups, got %d", len(f.Groups))
+	}
+	names := []string{f.Groups[0].Name, f.Groups[1].Name}
+	if !(contains(names, "included") && contains(names, "local")) {
+		t.Errorf("groups = %v", names)
+	}
+}
+
+func TestMergeBuildsAppended(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "*.c"
+    output   = "solution"
+    warnings = strict
+}
+build "release" { profile = release }
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+include "common.jdg"
+build "debug" { profile = debug }
+group("g") { weight = 1.0 test("t") { stdout = "ok\n" } }
+`)
+	f, _, err := ParseFile(mainPath)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if len(f.Builds) != 2 {
+		t.Fatalf("want 2 builds, got %d", len(f.Builds))
+	}
+}
+
+func TestMergeBinarySourcesAndFlags(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+build "make"
+binary = "solution"
+sources = "*.c"
+normalize_crlf = true
+trim_trailing_ws = true
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+include "common.jdg"
+group("g") { weight = 1.0 test("t") { stdout = "ok\n" } }
+`)
+	f, _, err := ParseFile(mainPath)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.Binary != "solution" {
+		t.Errorf("Binary = %q, want solution", f.Binary)
+	}
+	if f.Sources != "*.c" {
+		t.Errorf("Sources = %q, want *.c", f.Sources)
+	}
+	if !f.NormalizeCRLF {
+		t.Error("NormalizeCRLF not merged")
+	}
+	if !f.TrimTrailingWS {
+		t.Error("TrimTrailingWS not merged")
+	}
+}
+
+func TestMergeLocalOverridesTimeout(t *testing.T) {
+	dir := t.TempDir()
+	writeTempJdg(t, dir, "common.jdg", `
+build "make"
+timeout 10s
+memory_limit = 128MB
+`)
+	mainPath := writeTempJdg(t, dir, "main.jdg", `
+include "common.jdg"
+timeout 3s
+memory_limit = 64MB
+group("g") { weight = 1.0 test("t") { stdout = "ok\n" } }
+`)
+	f, _, err := ParseFile(mainPath)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.Timeout != 3*time.Second {
+		t.Errorf("Timeout = %v, want local 3s", f.Timeout)
+	}
+	if f.MemoryLimit != 64*1024*1024 {
+		t.Errorf("MemoryLimit = %d, want local 64MB", f.MemoryLimit)
+	}
+}
+
+func contains(xs []string, s string) bool {
+	for _, x := range xs {
+		if x == s {
+			return true
+		}
+	}
+	return false
+}

dsl/parser_errors_test.go

@@ -0,0 +1,299 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParserErrorCases(t *testing.T) {
+	const prefix = `build "go build ."` + "\n"
+	cases := []struct {
+		name string
+		body string
+		want string
+	}{
+		{
+			name: "group missing lparen",
+			body: `group "g" { weight = 1.0 test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group name not string",
+			body: `group(foo) { weight = 1.0 test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group missing rparen",
+			body: `group("g" { weight = 1.0 test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group missing lbrace",
+			body: `group("g") weight = 1.0`,
+			want: "expected",
+		},
+		{
+			name: "group non-ident in body",
+			body: `group("g") { 42 }`,
+			want: "unexpected token",
+		},
+		{
+			name: "group weight missing assign",
+			body: `group("g") { weight 1.0 test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group weight non-number",
+			body: `group("g") { weight = "bad" test("t") { stdout = "" } }`,
+			want: "",
+		},
+		{
+			name: "group timeout missing assign",
+			body: `group("g") { weight = 1.0 timeout 5s test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group timeout non-duration",
+			body: `group("g") { weight = 1.0 timeout = "5s" test("t") { stdout = "" } }`,
+			want: "",
+		},
+		{
+			name: "group memory_limit missing assign",
+			body: `group("g") { weight = 1.0 memory_limit 64MB test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group memory_limit non-size",
+			body: `group("g") { weight = 1.0 memory_limit = "64MB" test("t") { stdout = "" } }`,
+			want: "",
+		},
+		{
+			name: "group scoring missing assign",
+			body: `group("g") { weight = 1.0 scoring partial test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group scoring non-ident",
+			body: `group("g") { weight = 1.0 scoring = "partial" test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group env missing lparen",
+			body: `group("g") { weight = 1.0 env "K" = "v" test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group env key not string",
+			body: `group("g") { weight = 1.0 env(K) = "v" test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group env missing rparen",
+			body: `group("g") { weight = 1.0 env("K" = "v" test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group env missing assign",
+			body: `group("g") { weight = 1.0 env("K") "v" test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group env value not string",
+			body: `group("g") { weight = 1.0 env("K") = K test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group wrapper missing assign",
+			body: `group("g") { weight = 1.0 wrapper "x" test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group wrapper not string",
+			body: `group("g") { weight = 1.0 wrapper = X test("t") { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "group unclosed",
+			body: `group("g") { weight = 1.0 test("t") { stdout = "" }`,
+			want: "",
+		},
+		{
+			name: "group pattern error",
+			body: `group("g") { weight = 1.0 pattern { bogus = 1 } }`,
+			want: "",
+		},
+
+		{
+			name: "test missing lparen",
+			body: `group("g") { weight = 1.0 test "t" { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test name not string",
+			body: `group("g") { weight = 1.0 test(t) { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test missing rparen",
+			body: `group("g") { weight = 1.0 test("t" { stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test missing lbrace",
+			body: `group("g") { weight = 1.0 test("t") stdout = "" }`,
+			want: "expected",
+		},
+		{
+			name: "test non-ident in body",
+			body: `group("g") { weight = 1.0 test("t") { 42 } }`,
+			want: "unexpected token",
+		},
+		{
+			name: "test stdin missing assign",
+			body: `group("g") { weight = 1.0 test("t") { stdin "x" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test stdin not string",
+			body: `group("g") { weight = 1.0 test("t") { stdin = 1 stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test args missing assign",
+			body: `group("g") { weight = 1.0 test("t") { args "x" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test exitCode missing assign",
+			body: `group("g") { weight = 1.0 test("t") { exitCode 0 stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test exitCode not int",
+			body: `group("g") { weight = 1.0 test("t") { exitCode = "x" stdout = "" } }`,
+			want: "",
+		},
+		{
+			name: "test timeout missing assign",
+			body: `group("g") { weight = 1.0 test("t") { timeout 2s stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test timeout not duration",
+			body: `group("g") { weight = 1.0 test("t") { timeout = "2s" stdout = "" } }`,
+			want: "",
+		},
+		{
+			name: "test memory_limit missing assign",
+			body: `group("g") { weight = 1.0 test("t") { memory_limit 64MB stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test memory_limit not size",
+			body: `group("g") { weight = 1.0 test("t") { memory_limit = "64MB" stdout = "" } }`,
+			want: "",
+		},
+		{
+			name: "test wrapper missing assign",
+			body: `group("g") { weight = 1.0 test("t") { wrapper "x" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test wrapper not string",
+			body: `group("g") { weight = 1.0 test("t") { wrapper = X stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test env missing lparen",
+			body: `group("g") { weight = 1.0 test("t") { env "K" = "v" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test env key not string",
+			body: `group("g") { weight = 1.0 test("t") { env(K) = "v" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test env missing rparen",
+			body: `group("g") { weight = 1.0 test("t") { env("K" = "v" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test env missing assign",
+			body: `group("g") { weight = 1.0 test("t") { env("K") "v" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test env value not string",
+			body: `group("g") { weight = 1.0 test("t") { env("K") = K stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test file missing lparen",
+			body: `group("g") { weight = 1.0 test("t") { file "x" = "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test file key not string",
+			body: `group("g") { weight = 1.0 test("t") { file(x) = "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test file missing rparen",
+			body: `group("g") { weight = 1.0 test("t") { file("x" = "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test file missing assign",
+			body: `group("g") { weight = 1.0 test("t") { file("x") "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test file value not string",
+			body: `group("g") { weight = 1.0 test("t") { file("x") = y stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test outFile missing lparen",
+			body: `group("g") { weight = 1.0 test("t") { outFile "x" = "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test outFile key not string",
+			body: `group("g") { weight = 1.0 test("t") { outFile(x) = "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test outFile missing rparen",
+			body: `group("g") { weight = 1.0 test("t") { outFile("x" = "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test outFile missing assign",
+			body: `group("g") { weight = 1.0 test("t") { outFile("x") "y" stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test outFile value not string",
+			body: `group("g") { weight = 1.0 test("t") { outFile("x") = y stdout = "" } }`,
+			want: "expected",
+		},
+		{
+			name: "test unclosed",
+			body: `group("g") { weight = 1.0 test("t") { stdout = ""`,
+			want: "",
+		},
+	}
+
+	for _, c := range cases {
+		t.Run(c.name, func(t *testing.T) {
+			_, _, err := Parse(prefix + c.body)
+			if err == nil {
+				t.Fatalf("expected error, got nil")
+			}
+			if c.want != "" && !strings.Contains(err.Error(), c.want) {
+				t.Errorf("error = %q, want substring %q", err.Error(), c.want)
+			}
+		})
+	}
+}

dsl/parser_features_test.go

@@ -0,0 +1,237 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+	"time"
+)
+
+func parseOrFatal(t *testing.T, src string) *File {
+	t.Helper()
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse error: %v", err)
+	}
+	return f
+}
+
+func parseExpectError(t *testing.T, src, wantSubstr string) {
+	t.Helper()
+	_, _, err := Parse(src)
+	if err == nil {
+		t.Fatalf("expected error containing %q, got nil", wantSubstr)
+	}
+	if !strings.Contains(err.Error(), wantSubstr) {
+		t.Errorf("error = %q, want substring %q", err.Error(), wantSubstr)
+	}
+}
+
+func TestParseTestFileAndOutFile(t *testing.T) {
+	src := `
+build "go build ."
+
+group("g") {
+    weight = 1.0
+    test("files") {
+        file("input.txt") = "1 2 3\n"
+        outFile("result.txt") = "6\n"
+        stdout = ""
+    }
+}
+`
+	f := parseOrFatal(t, src)
+	tst := f.Groups[0].Tests[0]
+	if tst.InFiles["input.txt"] != "1 2 3\n" {
+		t.Errorf("InFiles[input.txt] = %q", tst.InFiles["input.txt"])
+	}
+	if tst.OutFiles["result.txt"] != "6\n" {
+		t.Errorf("OutFiles[result.txt] = %q", tst.OutFiles["result.txt"])
+	}
+}
+
+func TestParseTestEnvAndWrapper(t *testing.T) {
+	src := `
+build "go build ."
+
+group("g") {
+    weight = 1.0
+    test("env") {
+        env("FOO") = "bar"
+        env("BAZ") = "qux"
+        wrapper = "valgrind"
+        stdout = ""
+    }
+}
+`
+	f := parseOrFatal(t, src)
+	tst := f.Groups[0].Tests[0]
+	if tst.Env["FOO"] != "bar" || tst.Env["BAZ"] != "qux" {
+		t.Errorf("Env = %v", tst.Env)
+	}
+	if tst.Wrapper != "valgrind" {
+		t.Errorf("Wrapper = %q", tst.Wrapper)
+	}
+}
+
+func TestParseTestTimeoutAndMemoryOverride(t *testing.T) {
+	src := `
+build "go build ."
+timeout 10s
+
+group("g") {
+    weight = 1.0
+    memory_limit = 256MB
+    test("override") {
+        timeout = 2s
+        memory_limit = 64MB
+        stdout = ""
+    }
+}
+`
+	f := parseOrFatal(t, src)
+	tst := f.Groups[0].Tests[0]
+	if tst.Timeout != 2*time.Second {
+		t.Errorf("Timeout = %v, want 2s", tst.Timeout)
+	}
+	if tst.MemoryLimit != 64*1024*1024 {
+		t.Errorf("MemoryLimit = %d, want %d", tst.MemoryLimit, 64*1024*1024)
+	}
+}
+
+func TestParseTestExitCodeNonZero(t *testing.T) {
+	src := `
+build "go build ."
+
+group("g") {
+    weight = 1.0
+    test("fail") {
+        exitCode = 42
+        stdout = ""
+    }
+}
+`
+	f := parseOrFatal(t, src)
+	tst := f.Groups[0].Tests[0]
+	if tst.ExitCode == nil || *tst.ExitCode != 42 {
+		t.Errorf("ExitCode = %v, want 42", tst.ExitCode)
+	}
+}
+
+func TestParseTestUnknownKeyword(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    test("bad") {
+        bogus = "x"
+    }
+}
+`
+	parseExpectError(t, src, `"bogus"`)
+}
+
+func TestParseGroupScoringPartial(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    scoring = partial
+    test("t") { stdout = "" }
+}
+`
+	f := parseOrFatal(t, src)
+	if f.Groups[0].Scoring != ScoringPartial {
+		t.Errorf("Scoring = %v, want partial", f.Groups[0].Scoring)
+	}
+}
+
+func TestParseGroupScoringAllOrNone(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    scoring = all_or_none
+    test("t") { stdout = "" }
+}
+`
+	f := parseOrFatal(t, src)
+	if f.Groups[0].Scoring != ScoringAllOrNone {
+		t.Errorf("Scoring = %v, want all_or_none", f.Groups[0].Scoring)
+	}
+}
+
+func TestParseGroupScoringUnknown(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    scoring = magic
+    test("t") { stdout = "" }
+}
+`
+	parseExpectError(t, src, "unknown scoring mode")
+}
+
+func TestParseGroupEnvAndWrapper(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    env("LANG") = "C"
+    env("DEBUG") = "1"
+    wrapper = "strace"
+    test("t") { stdout = "" }
+}
+`
+	f := parseOrFatal(t, src)
+	g := f.Groups[0]
+	if g.Env["LANG"] != "C" || g.Env["DEBUG"] != "1" {
+		t.Errorf("group Env = %v", g.Env)
+	}
+	if g.Wrapper != "strace" {
+		t.Errorf("group Wrapper = %q", g.Wrapper)
+	}
+}
+
+func TestParseGroupMemoryLimit(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    memory_limit = 128MB
+    test("t") { stdout = "" }
+}
+`
+	f := parseOrFatal(t, src)
+	if f.Groups[0].MemoryLimit != 128*1024*1024 {
+		t.Errorf("group MemoryLimit = %d", f.Groups[0].MemoryLimit)
+	}
+}
+
+func TestParseGroupUnknownKeyword(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    weight = 1.0
+    foobar = 1
+    test("t") { stdout = "" }
+}
+`
+	parseExpectError(t, src, `"foobar"`)
+}
+
+func TestParseGroupMissingWeight(t *testing.T) {
+	src := `
+build "go build ."
+group("g") {
+    test("t") { stdout = "" }
+}
+`
+	_, warns, err := Parse(src)
+	if err != nil && !strings.Contains(err.Error(), "weight") {
+		return
+	}
+	if err == nil && len(warns) == 0 {
+		t.Error("expected error or warning about missing weight")
+	}
+}

dsl/parser_misc_test.go

@@ -0,0 +1,193 @@
+package dsl
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestParsePatternDirsMode(t *testing.T) {
+	src := `
+build "make"
+group("g") {
+    weight = 1.0
+    pattern {
+        dirs   = "tests/*"
+        input  = "in.txt"
+        output = "out.txt"
+        args   = "--case" "{name}"
+    }
+}
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	pat := f.Groups[0].Pattern
+	if pat == nil {
+		t.Fatal("no pattern")
+	}
+	if pat.DirsGlob != "tests/*" {
+		t.Errorf("DirsGlob = %q", pat.DirsGlob)
+	}
+	if pat.InputFile != "in.txt" || pat.OutputFile != "out.txt" {
+		t.Errorf("InputFile/OutputFile = %q/%q", pat.InputFile, pat.OutputFile)
+	}
+	if len(pat.Args) != 2 || pat.Args[0] != "--case" || pat.Args[1] != "{name}" {
+		t.Errorf("Args = %v", pat.Args)
+	}
+}
+
+func TestParsePatternUnknownField(t *testing.T) {
+	src := `
+build "make"
+group("g") {
+    weight = 1.0
+    pattern { bogus = "x" }
+}
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "unknown pattern field") {
+		t.Errorf("want unknown pattern field error, got %v", err)
+	}
+}
+
+func TestParsePatternNonIdent(t *testing.T) {
+	src := `
+build "make"
+group("g") {
+    weight = 1.0
+    pattern { "x" = "y" }
+}
+`
+	_, _, err := Parse(src)
+	if err == nil {
+		t.Error("expected error on non-ident in pattern")
+	}
+}
+
+func TestParseNormalizeCRLFAndTrimWS(t *testing.T) {
+	src := `
+build "make"
+normalize_crlf = true
+trim_trailing_ws = false
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if !f.NormalizeCRLF {
+		t.Error("NormalizeCRLF should be true")
+	}
+	if f.TrimTrailingWS {
+		t.Error("TrimTrailingWS should be false")
+	}
+}
+
+func TestParseBinaryAndSources(t *testing.T) {
+	src := `
+build "make"
+binary = "sol"
+sources = "main.c"
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.Binary != "sol" {
+		t.Errorf("Binary = %q", f.Binary)
+	}
+	if f.Sources != "main.c" {
+		t.Errorf("Sources = %q", f.Sources)
+	}
+}
+
+func TestParseMemoryLimitBareInt(t *testing.T) {
+	src := `
+build "make"
+memory_limit = 1024
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	f, _, err := Parse(src)
+	if err != nil {
+		t.Fatalf("parse: %v", err)
+	}
+	if f.MemoryLimit != 1024 {
+		t.Errorf("MemoryLimit = %d, want 1024", f.MemoryLimit)
+	}
+}
+
+func TestParseBoolInvalidIdent(t *testing.T) {
+	_, _, err := Parse("build \"make\"\nnormalize_crlf = maybe\n")
+	if err == nil || !strings.Contains(err.Error(), "true/false") {
+		t.Errorf("want true/false error, got %v", err)
+	}
+}
+
+func TestParseBoolNonIdent(t *testing.T) {
+	_, _, err := Parse("build \"make\"\nnormalize_crlf = \"true\"\n")
+	if err == nil || !strings.Contains(err.Error(), "true/false") {
+		t.Errorf("want true/false error, got %v", err)
+	}
+}
+
+func TestParseTopLevelNonIdent(t *testing.T) {
+	_, _, err := Parse(`"stray"`)
+	if err == nil || !strings.Contains(err.Error(), "unexpected token") {
+		t.Errorf("want unexpected token error, got %v", err)
+	}
+}
+
+func TestParseMatcherOrAssignNoMatcher(t *testing.T) {
+	src := `
+build "make"
+group("g") {
+    weight = 1.0
+    test("t") { stdout 42 }
+}
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "expected matcher") {
+		t.Errorf("want matcher error, got %v", err)
+	}
+}
+
+func TestParseStringListEmpty(t *testing.T) {
+	src := `
+build "make"
+group("g") {
+    weight = 1.0
+    test("t") { args = stdout = "" }
+}
+`
+	_, _, err := Parse(src)
+	if err == nil {
+		t.Error("expected error on empty string list")
+	}
+}
+
+func TestParseFileMissing(t *testing.T) {
+	_, _, err := ParseFile("/nonexistent/judge-test-does-not-exist.jdg")
+	if err == nil {
+		t.Error("expected error on missing file")
+	}
+}
+
+func TestValidateBuildsMixedLegacyAndStructured(t *testing.T) {
+	src := `
+build "legacy shell"
+build_defaults {
+    language = "c"
+    standard = "c11"
+    sources  = "*.c"
+    output   = "sol"
+    warnings = strict
+}
+group("g") { weight = 1.0 test("t") { stdout = "" } }
+`
+	_, _, err := Parse(src)
+	if err == nil || !strings.Contains(err.Error(), "cannot mix legacy") {
+		t.Errorf("want mix-legacy error, got %v", err)
+	}
+}

runner/result_test.go

@@ -1,6 +1,44 @@
 package runner
 
-import "testing"
+import (
+	"strings"
+	"testing"
+)
+
+func TestStatusString(t *testing.T) {
+	cases := []struct {
+		s    Status
+		want string
+	}{
+		{StatusPass, "PASS"},
+		{StatusFail, "FAIL"},
+		{StatusTLE, "TLE"},
+		{StatusMLE, "MLE"},
+		{StatusBuildError, "BUILD_ERROR"},
+		{StatusRuntimeError, "RE"},
+		{Status(999), "UNKNOWN"},
+	}
+	for _, c := range cases {
+		if got := c.s.String(); got != c.want {
+			t.Errorf("Status(%d).String() = %q, want %q", c.s, got, c.want)
+		}
+	}
+}
+
+func TestAddFailureAppends(t *testing.T) {
+	r := &TestResult{}
+	r.addFailure("first %s", "msg")
+	r.addFailure("second %d", 2)
+	if len(r.Failures) != 2 {
+		t.Fatalf("Failures len = %d, want 2", len(r.Failures))
+	}
+	if r.Failures[0] != "first msg" {
+		t.Errorf("Failures[0] = %q", r.Failures[0])
+	}
+	if !strings.Contains(r.Failures[1], "second 2") {
+		t.Errorf("Failures[1] = %q", r.Failures[1])
+	}
+}
 
 func TestAggregateScoreEmpty(t *testing.T) {
 	r := &SuiteResult{}