test(cmd): smoke-test bundle-check resolves spec aliases

cmd/internal-tools/bundle-check/main_test.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+// repoSpecSrc walks up from the test's working directory to the repo root and
+// returns pkg/spec/src. The bundle-check aliases once pointed at the
+// non-existent pkg/spec-api/src, so esbuild resolved nothing and the tool
+// silently emitted an empty bundle.
+func repoSpecSrc(t *testing.T) string {
+	t.Helper()
+	dir, err := os.Getwd()
+	if err != nil {
+		t.Fatal(err)
+	}
+	for {
+		candidate := filepath.Join(dir, "pkg/spec/src")
+		if _, err := os.Stat(filepath.Join(candidate, "index.ts")); err == nil {
+			return candidate
+		}
+		parent := filepath.Dir(dir)
+		if parent == dir {
+			t.Fatal("pkg/spec/src/index.ts not found above test dir")
+		}
+		dir = parent
+	}
+}
+
+func TestBundleSpec_ResolvesSpecAliases(t *testing.T) {
+	specSrc := repoSpecSrc(t)
+	entry, err := filepath.Abs(filepath.Join("testdata", "spec.ts"))
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	result, err := bundleSpec(specSrc, entry)
+	if err != nil {
+		t.Fatalf("bundle: %v", err)
+	}
+	if len(result.JavaScript) == 0 {
+		t.Fatal("empty bundle: aliases resolved to nothing")
+	}
+	if result.SHA256 == "" {
+		t.Fatal("missing bundle hash")
+	}
+
+	second, err := bundleSpec(specSrc, entry)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if result.SHA256 != second.SHA256 {
+		t.Errorf("unstable bundle hash: %s vs %s", result.SHA256, second.SHA256)
+	}
+}