github.com/letsencrypt/trillian@v1.1.2-0.20180615153820-ae375a99d36a/testonly/errors.go (about)

     1  // Copyright 2016 Google Inc. All Rights Reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package testonly
    16  
    17  import (
    18  	"strings"
    19  	"testing"
    20  )
    21  
    22  // EnsureErrorContains checks that an error contains a specific substring and fails a
    23  // test with a fatal if it does not or the error was nil.
    24  func EnsureErrorContains(t *testing.T, err error, s string) {
    25  	if err == nil {
    26  		t.Fatalf("%s operation unexpectedly succeeded", s)
    27  	}
    28  
    29  	if !strings.Contains(err.Error(), s) {
    30  		t.Fatalf("Got the wrong type of error: %v", err)
    31  	}
    32  }