go.mway.dev/x@v0.0.0-20240520034138-950aede9a3fb/stub/with_test.go (about)

     1  // Copyright (c) 2023 Matt Way
     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
     5  // deal in the Software without restriction, including without limitation the
     6  // rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
     7  // sell 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
    18  // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
    19  // IN THE THE SOFTWARE.
    20  
    21  package stub_test
    22  
    23  import (
    24  	"errors"
    25  	"testing"
    26  
    27  	"github.com/stretchr/testify/require"
    28  	"go.mway.dev/x/stub"
    29  )
    30  
    31  func TestWith(t *testing.T) {
    32  	var (
    33  		orig    = func() int { return 123 }
    34  		changed = func() int { return 0 }
    35  	)
    36  
    37  	require.Equal(t, 123, orig())
    38  	stub.With(&orig, changed, func() {
    39  		require.Equal(t, 0, orig())
    40  	})
    41  	require.Equal(t, 123, orig())
    42  }
    43  
    44  func TestWithError(t *testing.T) {
    45  	var (
    46  		errA    = errors.New("a")
    47  		errB    = errors.New("b")
    48  		orig    = func() error { return errA }
    49  		changed = func() error { return errB }
    50  	)
    51  
    52  	require.ErrorIs(t, orig(), errA)
    53  	stubErr := stub.WithError(&orig, changed, func() error {
    54  		err := orig()
    55  		require.ErrorIs(t, err, errB)
    56  		return err
    57  	})
    58  	require.ErrorIs(t, stubErr, errB)
    59  	require.ErrorIs(t, orig(), errA)
    60  }