1 files changed, 31 insertions, 0 deletions
diff --git a/src/encoding/json/decode_test.go b/src/encoding/json/decode_test.go
index 219e845c7b..b707dcfa99 100644
--- a/src/encoding/json/decode_test.go
+++ b/src/encoding/json/decode_test.go
@@ -2572,3 +2572,34 @@ func TestUnmarshalMaxDepth(t *testing.T) {
 		}
 	}
 }
+
+func TestInvalidUnmarshalErrorIs(t *testing.T) {
+	err := fmt.Errorf("apackage: %w: failed to parse struct", &InvalidUnmarshalError{reflect.TypeOf("a")})
+	if !errors.Is(err, &InvalidUnmarshalError{}) {
+		t.Fatalf("%v should be unwrapped to a InvalidUnmarshalError", err)
+	}
+}
+
+func TestUnmarshalFieldErrorIs(t *testing.T) {
+	err := fmt.Errorf("apackage: %w: failed to parse struct", &UnmarshalFieldError{
+		Key:   "foo",
+		Type:  reflect.TypeOf("a"),
+		Field: reflect.StructField{Name: "b"},
+	})
+	if !errors.Is(err, &UnmarshalFieldError{}) {
+		t.Fatalf("%v should be unwrapped to a UnmarshalFieldError", err)
+	}
+}
+
+func TestUnmarshalTypeErrorIs(t *testing.T) {
+	err := fmt.Errorf("apackage: %w: failed to parse struct", &UnmarshalTypeError{
+		Value:  "foo",
+		Type:   reflect.TypeOf("a"),
+		Offset: 1,
+		Struct: "Foo",
+		Field:  "Bar",
+	})
+	if !errors.Is(err, &UnmarshalTypeError{}) {
+		t.Fatalf("%v should be unwrapped to a UnmarshalTypeError", err)
+	}
+}