go.uber.org/yarpc@v1.72.1/internal/errorsync/err_test.go (about)

     1  // Copyright (c) 2022 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package errorsync
    22  
    23  import (
    24  	"errors"
    25  	"testing"
    26  
    27  	"github.com/stretchr/testify/assert"
    28  )
    29  
    30  func TestErrorWaiter(t *testing.T) {
    31  	one := errors.New("1")
    32  	two := errors.New("2")
    33  
    34  	tests := []struct {
    35  		desc string
    36  		errs []error
    37  		want []error
    38  	}{
    39  		{
    40  			"nothing",
    41  			nil,
    42  			nil,
    43  		},
    44  		{
    45  			"empty list",
    46  			[]error{},
    47  			nil,
    48  		},
    49  		{
    50  			"no errors",
    51  			[]error{nil, nil, nil},
    52  			nil,
    53  		},
    54  		{
    55  			"single error",
    56  			[]error{nil, one, nil},
    57  			[]error{one},
    58  		},
    59  		{
    60  			"multiple errors",
    61  			[]error{nil, one, two, nil},
    62  			[]error{one, two},
    63  		},
    64  	}
    65  
    66  	for _, tt := range tests {
    67  		want := make(map[error]struct{})
    68  		for _, err := range tt.want {
    69  			want[err] = struct{}{}
    70  		}
    71  
    72  		var ew ErrorWaiter
    73  		for _, err := range tt.errs {
    74  			// Need to create a local variable to make sure that the correct
    75  			// value is used by the closure since the value 'err' points to
    76  			// will change between iterations.
    77  			errLocal := err
    78  			ew.Submit(func() error { return errLocal })
    79  		}
    80  
    81  		got := make(map[error]struct{})
    82  		for _, err := range ew.Wait() {
    83  			got[err] = struct{}{}
    84  		}
    85  
    86  		assert.Equal(t, want, got, tt.desc)
    87  	}
    88  }