Function unsetEnv

cmd/compose/hooks_test.go:306–320

unsetEnv removes an env var for the lifetime of the test, restoring its prior state on cleanup. t.Setenv("", "") is not equivalent to unset: compose-go's WithConfigFileEnv treats empty as a meaningful override.

(t *testing.T, key string)

// prior state on cleanup. t.Setenv("", "") is not equivalent to unset:
// compose-go's WithConfigFileEnv treats empty as a meaningful override.
func unsetEnv(t *testing.T, key string) {
	t.Helper()
	prev, had := os.LookupEnv(key)
	if err := os.Unsetenv(key); err != nil {
		t.Fatalf("unsetenv %s: %v", key, err)
	}
	t.Cleanup(func() {
		if !had {
			return
		}
		if err := os.Setenv(key, prev); err != nil {
			t.Errorf("restore env %s: %v", key, err)
		}
	})
}

func mustWrite(t *testing.T, dir, name, content string) {
	t.Helper()