1/* 2Copyright 2018 The Kubernetes Authors. 3 4Licensed under the Apache License, Version 2.0 (the "License"); 5you may not use this file except in compliance with the License. 6You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10Unless required by applicable law or agreed to in writing, software 11distributed under the License is distributed on an "AS IS" BASIS, 12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13See the License for the specific language governing permissions and 14limitations under the License. 15*/ 16 17package genericclioptions 18 19import ( 20 "bytes" 21 "io" 22 "io/ioutil" 23) 24 25// IOStreams provides the standard names for iostreams. This is useful for embedding and for unit testing. 26// Inconsistent and different names make it hard to read and review code 27type IOStreams struct { 28 // In think, os.Stdin 29 In io.Reader 30 // Out think, os.Stdout 31 Out io.Writer 32 // ErrOut think, os.Stderr 33 ErrOut io.Writer 34} 35 36// NewTestIOStreams returns a valid IOStreams and in, out, errout buffers for unit tests 37func NewTestIOStreams() (IOStreams, *bytes.Buffer, *bytes.Buffer, *bytes.Buffer) { 38 in := &bytes.Buffer{} 39 out := &bytes.Buffer{} 40 errOut := &bytes.Buffer{} 41 42 return IOStreams{ 43 In: in, 44 Out: out, 45 ErrOut: errOut, 46 }, in, out, errOut 47} 48 49// NewTestIOStreamsDiscard returns a valid IOStreams that just discards 50func NewTestIOStreamsDiscard() IOStreams { 51 in := &bytes.Buffer{} 52 return IOStreams{ 53 In: in, 54 Out: ioutil.Discard, 55 ErrOut: ioutil.Discard, 56 } 57} 58