Add internal engine relocation candidate

internal/engine/parse_test.go

@@ -0,0 +1,38 @@
+package engine
+
+import (
+	"strings"
+	"testing"
+
+	"gitea.maximumdirect.net/eric/ConfigKit/internal/document"
+	"gitea.maximumdirect.net/eric/ConfigKit/internal/yaml"
+)
+
+func TestParseSourceOwnsDocumentAndSafeDiagnostics(t *testing.T) {
+	t.Parallel()
+
+	limits := defaultParseLimits()
+	parsed, diagnostics := parseSource(Bytes("memory.yml", []byte("name: config\n")), "source-1", limits)
+	if len(diagnostics) != 0 || parsed.source == nil || parsed.source.Label != "memory.yml" || parsed.document.Kind != document.Mapping {
+		t.Fatalf("parse result = %#v, diagnostics = %#v", parsed, diagnostics)
+	}
+
+	const canary = "CANARY_PRIVATE_INPUT"
+	failed, diagnostics := parseSource(Bytes("unsafe\nlabel", []byte("name: ["+canary+"\n")), "source-1", limits)
+	if failed.document != nil || failed.source == nil || len(diagnostics) != 1 || diagnostics[0].Code != CodeYAMLInvalid {
+		t.Fatalf("failed parse = %#v, diagnostics = %#v", failed, diagnostics)
+	}
+	var output strings.Builder
+	if err := WriteDiagnostics(&output, diagnostics); err != nil {
+		t.Fatal(err)
+	}
+	if strings.Contains(output.String(), canary) || strings.Count(output.String(), "\n") != 1 {
+		t.Fatalf("unsafe rendered diagnostic = %q", output.String())
+	}
+
+	limits.document = yaml.Limits{Depth: 1, Nodes: 20, ParserDepth: 20}
+	_, diagnostics = parseSource(Bytes("deep", []byte("a:\n  b: value\n")), "source-1", limits)
+	if len(diagnostics) != 1 || diagnostics[0].Code != CodeYAMLDepthLimit || diagnostics[0].Primary.Line == 0 {
+		t.Fatalf("depth diagnostics = %#v", diagnostics)
+	}
+}