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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,19 @@ | ||
| //go:build go1.20 | ||
| // +build go1.20 | ||
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| package errors | ||
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| import stderrors "errors" | ||
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| // Join allows this library to be a drop-in replacement to the std library. | ||
| // | ||
| // Join returns an error that wraps the given errors. Any nil error values are discarded. | ||
| // Join returns nil if every value in errs is nil. The error formats as the concatenation of the strings obtained | ||
| // by calling the Error method of each element of errs, with a newline between each string. | ||
| // | ||
| // A non-nil error returned by Join implements the Unwrap() []error method. | ||
| // | ||
| // It is the responsibility of the caller to then check for nil and wrap this error if desired. | ||
| func Join(errs ...error) error { | ||
| return stderrors.Join(errs...) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,39 @@ | ||
| //go:build go1.20 | ||
| // +build go1.20 | ||
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| package errors | ||
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| import ( | ||
| "io" | ||
| "testing" | ||
| ) | ||
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| func TestJoin(t *testing.T) { | ||
| err1 := io.EOF | ||
| err2 := io.ErrUnexpectedEOF | ||
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| err := Join(err1, err2) | ||
| innerErr, ok := err.(interface{ Unwrap() []error }) | ||
| if !ok { | ||
| t.Fatalf("expected Join to return an error that implements Unwrap() []error") | ||
| } | ||
| errs := innerErr.Unwrap() | ||
| if len(errs) != 2 { | ||
| t.Fatalf("expected Join to return an error that implements Unwrap() []error to return 2 errors") | ||
| } | ||
| if !Is(errs[0], io.EOF) { | ||
| t.Fatalf("expected Join to return an error that implements Unwrap() []error to return io.EOF") | ||
| } | ||
| if !Is(errs[1], io.ErrUnexpectedEOF) { | ||
| t.Fatalf("expected Join to return an error that implements Unwrap() []error to return io.ErrUnexpectedEOF") | ||
| } | ||
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| // test wrapping and then unwrapping with Chain | ||
| err = Wrap(err, "my test wrapped error") | ||
| if !Is(err, io.EOF) { | ||
| t.Fatalf("expected wrapped error to traverse into joined inner error EOF") | ||
| } | ||
| if !Is(err, io.ErrUnexpectedEOF) { | ||
| t.Fatalf("expected wrapped error to traverse into joined inner error ErrUnexpectedEOF") | ||
| } | ||
| } |
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