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Signed-off-by: Maxime Soulé <btik-git@scoubidou.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| // Copyright (c) 2022, Maxime Soulé | ||
| // All rights reserved. | ||
| // | ||
| // This source code is licensed under the BSD-style license found in the | ||
| // LICENSE file in the root directory of this source tree. | ||
|
|
||
| package td | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "reflect" | ||
|
|
||
| "github.com/maxatome/go-testdeep/internal/ctxerr" | ||
| "github.com/maxatome/go-testdeep/internal/dark" | ||
| "github.com/maxatome/go-testdeep/internal/types" | ||
| ) | ||
|
|
||
| type tdErrorIs struct { | ||
| baseOKNil | ||
| expected error | ||
| } | ||
|
|
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| var _ TestDeep = &tdErrorIs{} | ||
|
|
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| func errorToRawString(err error) types.RawString { | ||
| if err == nil { | ||
| return "nil" | ||
| } | ||
| return types.RawString(fmt.Sprintf("(%[1]T) %[1]q", err)) | ||
| } | ||
|
|
||
| // summary(ErrorIs): checks the data is an error and matches a wrapped error | ||
| // input(ErrorIs): if(error) | ||
|
|
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| // ErrorIs operator reports whether any error in an error's chain | ||
| // matches expected. | ||
| // | ||
| // _, err := os.Open("/unknown/file") | ||
| // td.Cmp(t, err, os.ErrNotExist) // fails | ||
| // td.Cmp(t, err, td.ErrorIs(os.ErrNotExist)) // succeeds | ||
| // | ||
| // err1 := fmt.Errorf("failure1") | ||
| // err2 := fmt.Errorf("failure2: %w", err1) | ||
| // err3 := fmt.Errorf("failure3: %w", err2) | ||
| // err := fmt.Errorf("failure4: %w", err3) | ||
| // td.Cmp(t, err, td.ErrorIs(err)) // succeeds | ||
| // td.Cmp(t, err, td.ErrorIs(err1)) // succeeds | ||
| // td.Cmp(t, err1, td.ErrorIs(err)) // fails | ||
| // | ||
| // Behind the scene it uses [errors.Is] function. | ||
| // | ||
| // Note that like [errors.Is], expected can be nil: in this case the | ||
| // comparison succeeds when got is nil too. | ||
| // | ||
| // See also [CmpError] and [CmpNoError]. | ||
| func ErrorIs(expected error) TestDeep { | ||
| return &tdErrorIs{ | ||
| baseOKNil: newBaseOKNil(3), | ||
| expected: expected, | ||
| } | ||
| } | ||
|
|
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| func (e *tdErrorIs) Match(ctx ctxerr.Context, got reflect.Value) *ctxerr.Error { | ||
| // nil case | ||
| if !got.IsValid() { | ||
| // Special case | ||
| if e.expected == nil { | ||
| return nil | ||
| } | ||
|
|
||
| if ctx.BooleanError { | ||
| return ctxerr.BooleanError | ||
| } | ||
| return ctx.CollectError(&ctxerr.Error{ | ||
| Message: "nil value", | ||
| Got: types.RawString("nil"), | ||
| Expected: types.RawString("anything implementing error interface"), | ||
| }) | ||
| } | ||
|
|
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| gotIf, ok := dark.GetInterface(got, true) | ||
| if !ok { | ||
| return ctx.CollectError(ctx.CannotCompareError()) | ||
| } | ||
|
|
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| gotErr, ok := gotIf.(error) | ||
| if !ok { | ||
| if ctx.BooleanError { | ||
| return ctxerr.BooleanError | ||
| } | ||
| return ctx.CollectError(&ctxerr.Error{ | ||
| Message: got.Type().String() + " does not implement error interface", | ||
| Got: gotIf, | ||
| Expected: types.RawString("anything implementing error interface"), | ||
| }) | ||
| } | ||
|
|
||
| if errors.Is(gotErr, e.expected) { | ||
| return nil | ||
| } | ||
|
|
||
| if ctx.BooleanError { | ||
| return ctxerr.BooleanError | ||
| } | ||
| return ctx.CollectError(&ctxerr.Error{ | ||
| Message: "is not the error", | ||
| Got: errorToRawString(gotErr), | ||
| Expected: errorToRawString(e.expected), | ||
| }) | ||
| } | ||
|
|
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| func (e *tdErrorIs) String() string { | ||
| if e.expected == nil { | ||
| return "ErrorIs(nil)" | ||
| } | ||
| return "ErrorIs(" + e.expected.Error() + ")" | ||
| } |
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