errors_test.go

Documentation: google.golang.org/protobuf/internal/errors

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package errors
     6  
     7  import (
     8  	"errors"
     9  	"strings"
    10  	"testing"
    11  )
    12  
    13  func TestErrors(t *testing.T) {
    14  	var sentinel = New("sentinel")
    15  	var foreign = errors.New("foreign")
    16  	for _, test := range []struct {
    17  		what     string
    18  		err      error
    19  		wantText string
    20  		is       []error
    21  		isNot    []error
    22  	}{{
    23  		what:     `New("abc")`,
    24  		err:      New("abc"),
    25  		wantText: "abc",
    26  	}, {
    27  		what:     `New("%v", sentinel)`,
    28  		err:      New("%v", sentinel),
    29  		wantText: "sentinel",
    30  		isNot:    []error{sentinel},
    31  	}, {
    32  		what:     `Wrap(sentinel, "%v", "text")`,
    33  		err:      Wrap(sentinel, "%v", "text"),
    34  		wantText: "text: sentinel",
    35  		is:       []error{sentinel},
    36  	}, {
    37  		what:     `New("%v", foreign)`,
    38  		err:      New("%v", foreign),
    39  		wantText: "foreign",
    40  		isNot:    []error{foreign},
    41  	}, {
    42  		what:     `Wrap(foreign, "%v", "text")`,
    43  		err:      Wrap(foreign, "%v", "text"),
    44  		wantText: "text: foreign",
    45  		is:       []error{foreign},
    46  	}} {
    47  		if got, want := test.err.Error(), prefix; !strings.HasPrefix(got, want) {
    48  			t.Errorf("%v.Error() = %q, want prefix %q", test.what, got, want)
    49  		}
    50  		if got, want := test.err.Error(), prefix+test.wantText; got != want {
    51  			t.Errorf("%v.Error() = %q, want %q", test.what, got, want)
    52  		}
    53  		if got, want := Is(test.err, Error), true; got != want {
    54  			t.Errorf("errors.Is(%v, errors.Error) = %v, want %v", test.what, got, want)
    55  		}
    56  		for _, err := range test.is {
    57  			if got, want := Is(test.err, err), true; got != want {
    58  				t.Errorf("errors.Is(%v, %v) = %v, want %v", test.what, err, got, want)
    59  			}
    60  		}
    61  		for _, err := range test.isNot {
    62  			if got, want := Is(test.err, err), false; got != want {
    63  				t.Errorf("errors.Is(%v, %v) = %v, want %v", test.what, err, got, want)
    64  			}
    65  		}
    66  	}
    67  }
    68
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