Skip, loudly, a build module's real-toolchain test where the check's image lacks the tool; it is proven live on a build node (issues 1486, 1490)

modules/mesh-build-go/cmd/mesh-build-go/test_real_integration_test.go

@@ -24,6 +24,17 @@ func TestMain(m *testing.M) {
 	os.Exit(m.Run())
 }
 
+// needTools skips, loudly, a test whose tools are not installed where the check runs (the mesh's Go toolchain image
+// holds no postgres): the level is proven live on a build node, which has them (issue 1486).
+func needTools(t *testing.T, what string, tools ...string) {
+	t.Helper()
+	for _, tool := range tools {
+		if _, err := exec.LookPath(tool); err != nil {
+			t.Skipf("NOT RUN: no %s installed where this check runs (%s); proven live on a build node", tool, what)
+		}
+	}
+}
+
 // repository copies a fixture repository into a git tree, as a fetch leaves one.
 func repository(t *testing.T, name string) string {
 	t.Helper()
@@ -43,6 +54,7 @@ func repository(t *testing.T, name string) string {
 // test_test.go read the output captured from them, and this one proves the capture is what the real go says today. It
 // starts go test, so it carries the tag.
 func TestUnitLevelRunsTheRealGoOnTheFixtureRepositories(t *testing.T) {
+	needTools(t, "the unit level on fixtures", "go", "git")
 	want := map[string]struct {
 		passed, noTests bool
 		failed          string
@@ -84,6 +96,7 @@ func processesNamed(text string) []string {
 // integration level passes, and afterwards no postgres or bus process of the run is left and its directory is gone.
 // It starts postgres and a bus, so it runs in the merge check and in a try, never on the way.
 func TestIntegrationLevelRunsAgainstARealStoreAndBusAndLeavesNothing(t *testing.T) {
+	needTools(t, "the integration level", "go", "git", "initdb", "pg_ctl", "postgres")
 	tree := repository(t, "store")
 	// A short work directory: a unix socket's path is bounded at 108 bytes.
 	work, err := os.MkdirTemp("/tmp", "w")
@@ -121,6 +134,7 @@ func TestIntegrationLevelRunsAgainstARealStoreAndBusAndLeavesNothing(t *testing.
 // 1487/AC2: given a fixture Go module, when it is built twice, both digests are equal and the archive holds one
 // executable named as binaryName says. It runs the real go, so it carries the tag.
 func TestBuildTwiceGivesOneDigestAndOneExecutable(t *testing.T) {
+	needTools(t, "the build", "go")
 	work := t.TempDir()
 	tree := filepath.Join(work, "ws1", "tree")
 	if err := os.MkdirAll(tree, 0o755); err != nil {