1 /* 2 Copyright 2017 The Kubernetes 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 http://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 temptest 18 19 import ( 20 "bytes" 21 "errors" 22 "io" 23 ) 24 25 // FakeFile is an implementation of a WriteCloser, that records what has 26 // been written in the file (in a bytes.Buffer) and if the file has been 27 // closed. 28 type FakeFile struct { 29 Buffer bytes.Buffer 30 Closed bool 31 } 32 33 var _ io.WriteCloser = &FakeFile{} 34 35 // Write appends the contents of p to the Buffer. If the file has 36 // already been closed, an error is returned. 37 func (f *FakeFile) Write(p []byte) (n int, err error) { 38 if f.Closed { 39 return 0, errors.New("can't write to closed FakeFile") 40 } 41 return f.Buffer.Write(p) 42 } 43 44 // Close records that the file has been closed. If the file has already 45 // been closed, an error is returned. 46 func (f *FakeFile) Close() error { 47 if f.Closed { 48 return errors.New("FakeFile was closed multiple times") 49 } 50 f.Closed = true 51 return nil 52 } 53