go/types: add a test for argument error unwrapping

Add a sanity-check test that ArgumentErrors unwrap their inner Err. Change-Id: I5a670a490deeabc03a64e42b3843f79d622ba958 Reviewed-on: https://go-review.googlesource.com/c/go/+/351338 Trust: Robert Findley <[email protected]> Run-TryBot: Robert Findley <[email protected]> TryBot-Result: Go Bot <[email protected]> Reviewed-by: Robert Griesemer <[email protected]>
zegl · Sep 22, 2021 · e925c46 · e925c46
1 parent 7158ae4
commit e925c46
Showing 1 changed file with 14 additions and 0 deletions.
diff --git a/src/go/types/api_test.go b/src/go/types/api_test.go
@@ -2012,6 +2012,20 @@ func TestInstantiateErrors(t *testing.T) {
 	}
 }
 
+func TestArgumentErrorUnwrapping(t *testing.T) {
+	var err error = &ArgumentError{
+		Index: 1,
+		Err:   Error{Msg: "test"},
+	}
+	var e Error
+	if !errors.As(err, &e) {
+		t.Fatalf("error %v does not wrap types.Error", err)
+	}
+	if e.Msg != "test" {
+		t.Errorf("e.Msg = %q, want %q", e.Msg, "test")
+	}
+}
+
 func TestInstanceIdentity(t *testing.T) {
 	imports := make(testImporter)
 	conf := Config{Importer: imports}