github.com/cloudfoundry/libcfbuildpack@v1.91.23/test/have_content.go (about) 1 /* 2 * Copyright 2018-2020 the original author or authors. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * https://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package test 18 19 import ( 20 "fmt" 21 "io/ioutil" 22 23 "github.com/onsi/gomega/types" 24 ) 25 26 // HaveContent tests that a file has expected content. 27 func HaveContent(expected string) types.GomegaMatcher { 28 return &haveContentMatcher{ 29 expected: expected, 30 } 31 } 32 33 type haveContentMatcher struct { 34 expected string 35 } 36 37 func (m *haveContentMatcher) Match(actual interface{}) (bool, error) { 38 path, ok := actual.(string) 39 if !ok { 40 return false, fmt.Errorf("HaveContent matcher expects a path") 41 } 42 43 b, err := ioutil.ReadFile(path) 44 if err != nil { 45 return false, fmt.Errorf("failed to read file: %s", err.Error()) 46 } 47 48 return string(b) == m.expected, nil 49 } 50 51 func (m *haveContentMatcher) FailureMessage(actual interface{}) string { 52 return fmt.Sprintf("Expected\n\t%#v\nto contain\n\t%#v", actual, m.expected) 53 } 54 55 func (m *haveContentMatcher) NegatedFailureMessage(actual interface{}) string { 56 return fmt.Sprintf("Expected\n\t%#v\nnot to contain\n\t%#v", actual, m.expected) 57 }