Function TestMultiError_As

multierror/multierror_test.go:110–151

(t *testing.T)

}

func TestMultiError_As(t *testing.T) {
	tE1 := testError{"error cause 1"}
	tE2 := testError{"error cause 2"}
	var target testError
	testCases := map[string]struct {
		sourceErrors []error
		target       error
		as           bool
	}{
		"MultiError containing only a testError can be cast to that testError": {
			sourceErrors: []error{tE1},
			target:       tE1,
			as:           true,
		},
		"MultiError containing multiple testErrors can be cast to the first testError added": {
			sourceErrors: []error{tE1, tE2},
			target:       tE1,
			as:           true,
		},
		"MultiError containing multiple errors can be cast to the first testError added": {
			sourceErrors: []error{context.Canceled, tE1, context.DeadlineExceeded, tE2},
			target:       tE1,
			as:           true,
		},
		"MultiError non containing a testError cannot be cast to a testError": {
			sourceErrors: []error{context.Canceled, context.DeadlineExceeded},
			as:           false,
		},
	}

	for testName, testCase := range testCases {
		t.Run(testName, func(t *testing.T) {
			mErr := New(testCase.sourceErrors...).Err()
			if testCase.as {
				require.True(t, errors.As(mErr, &target))
				require.Equal(t, testCase.target, target)
			} else {
				require.False(t, errors.As(mErr, &target))
			}
		})
	}
}

type testError struct {
	cause string