func TestNotef(t *testing.T) {
err0 := errors.WithCausef(nil, someErr, "foo") //err TestNotef#0
err := errors.Notef(err0, "bar") //err TestNotef#1
checkErr(t, err, err0, "bar: foo", "[{$TestNotef#1$: bar} {$TestNotef#0$: foo}]", err)
err = errors.Notef(nil, "bar") //err TestNotef#2
checkErr(t, err, nil, "bar", "[{$TestNotef#2$: bar}]", err)
}
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 TestCause(t *testing.T) {
if cause := errors.Cause(someErr); cause != someErr {
t.Fatalf("expected %q kind; got %#v", someErr, cause)
}
causeErr := errors.New("cause error")
underlyingErr := errors.New("underlying error") //err TestCause#1
err := errors.WithCausef(underlyingErr, causeErr, "foo %d", 99) //err TestCause#2
if errors.Cause(err) != causeErr {
t.Fatalf("expected %q; got %#v", causeErr, errors.Cause(err))
}
checkErr(t, err, underlyingErr, "foo 99: underlying error", "[{$TestCause#2$: foo 99} {$TestCause#1$: underlying error}]", causeErr)
err = &embed{err.(*errors.Err)}
if errors.Cause(err) != causeErr {
t.Fatalf("expected %q; got %#v", causeErr, errors.Cause(err))
}
}