1package gitdiff
 2
 3import (
 4	"errors"
 5	"strings"
 6	"testing"
 7)
 8
 9func assertError(t *testing.T, expected interface{}, actual error, action string) {
10	if actual == nil {
11		t.Fatalf("expected error %s, but got nil", action)
12	}
13
14	switch exp := expected.(type) {
15	case bool:
16		if !exp {
17			t.Fatalf("unexpected error %s: %v", action, actual)
18		}
19	case string:
20		if !strings.Contains(actual.Error(), exp) {
21			t.Fatalf("incorrect error %s: %q does not contain %q", action, actual.Error(), exp)
22		}
23	case error:
24		if !errors.Is(actual, exp) {
25			t.Fatalf("incorrect error %s: expected %T (%v), actual: %T (%v)", action, exp, exp, actual, actual)
26		}
27	default:
28		t.Fatalf("unsupported expected error type: %T", exp)
29	}
30}