func TestMask(t *testing.T) {
err0 := errors.WithCausef(nil, someErr, "foo") //err TestMask#0
err := errors.Mask(err0) //err TestMask#1
checkErr(t, err, err0, "foo", "[{$TestMask#1$: } {$TestMask#0$: foo}]", err)
err = errors.Mask(nil)
if err != nil {
t.Fatalf("expected nil got %#v", err)
}
}
func TestDetails(t *testing.T) {
if details := errors.Details(nil); details != "[]" {
t.Fatalf("errors.Details(nil) got %q want %q", details, "[]")
}
otherErr := fmt.Errorf("other")
checkErr(t, otherErr, nil, "other", "[{other}]", otherErr)
err0 := &embed{errors.New("foo").(*errors.Err)} //err TestStack#0
checkErr(t, err0, nil, "foo", "[{$TestStack#0$: foo}]", err0)
err1 := &embed{errors.Notef(err0, "bar").(*errors.Err)} //err TestStack#1
checkErr(t, err1, err0, "bar: foo", "[{$TestStack#1$: bar} {$TestStack#0$: foo}]", err1)
err2 := errors.Mask(err1) //err TestStack#2
checkErr(t, err2, err1, "bar: foo", "[{$TestStack#2$: } {$TestStack#1$: bar} {$TestStack#0$: foo}]", err2)
}