1 files changed, 63 insertions, 0 deletions
diff --git a/libgo/go/internal/oserror/errors_test.go b/libgo/go/internal/oserror/errors_test.go
new file mode 100644
index 00000000000..6d6a56a0c74
--- /dev/null
+++ b/libgo/go/internal/oserror/errors_test.go
@@ -0,0 +1,63 @@
+package oserror_test
+
+import (
+	"errors"
+	"fmt"
+	"internal/oserror"
+	"os"
+	"testing"
+)
+
+type ttError struct {
+	timeout   bool
+	temporary bool
+}
+
+func (e ttError) Error() string {
+	return fmt.Sprintf("ttError{timeout:%v temporary:%v}", e.timeout, e.temporary)
+}
+func (e ttError) Timeout() bool   { return e.timeout }
+func (e ttError) Temporary() bool { return e.temporary }
+
+type isError struct {
+	err error
+}
+
+func (e isError) Error() string        { return fmt.Sprintf("isError(%v)", e.err) }
+func (e isError) Is(target error) bool { return e.err == target }
+
+func TestIsTimeout(t *testing.T) {
+	for _, test := range []struct {
+		want bool
+		err  error
+	}{
+		{true, ttError{timeout: true}},
+		{true, isError{os.ErrTimeout}},
+		{true, os.ErrTimeout},
+		{true, fmt.Errorf("wrap: %w", os.ErrTimeout)},
+		{false, ttError{timeout: false}},
+		{false, errors.New("error")},
+	} {
+		if got, want := oserror.IsTimeout(test.err), test.want; got != want {
+			t.Errorf("IsTimeout(err) = %v, want %v\n%+v", got, want, test.err)
+		}
+	}
+}
+
+func TestIsTemporary(t *testing.T) {
+	for _, test := range []struct {
+		want bool
+		err  error
+	}{
+		{true, ttError{temporary: true}},
+		{true, isError{os.ErrTemporary}},
+		{true, os.ErrTemporary},
+		{true, fmt.Errorf("wrap: %w", os.ErrTemporary)},
+		{false, ttError{temporary: false}},
+		{false, errors.New("error")},
+	} {
+		if got, want := oserror.IsTemporary(test.err), test.want; got != want {
+			t.Errorf("IsTemporary(err) = %v, want %v\n%+v", got, want, test.err)
+		}
+	}
+}