1 // Copyright 2018 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 main 16 17 import ( 18 "bytes" 19 "strconv" 20 "testing" 21 ) 22 23 func TestCopyAndInject(t *testing.T) { 24 s := "abcdefghijklmnopqrstuvwxyz" 25 testCases := []struct { 26 offset, size uint64 27 value string 28 expected string 29 }{ 30 { 31 offset: 0, 32 size: 1, 33 value: "A", 34 expected: "Abcdefghijklmnopqrstuvwxyz", 35 }, 36 { 37 offset: 1, 38 size: 1, 39 value: "B", 40 expected: "aBcdefghijklmnopqrstuvwxyz", 41 }, 42 { 43 offset: 1, 44 size: 1, 45 value: "BCD", 46 expected: "aBcdefghijklmnopqrstuvwxyz", 47 }, 48 { 49 offset: 25, 50 size: 1, 51 value: "Z", 52 expected: "abcdefghijklmnopqrstuvwxyZ", 53 }, 54 } 55 56 for i, testCase := range testCases { 57 t.Run(strconv.Itoa(i), func(t *testing.T) { 58 in := bytes.NewReader([]byte(s)) 59 out := &bytes.Buffer{} 60 copyAndInject(in, out, testCase.offset, testCase.size, testCase.value) 61 62 if out.String() != testCase.expected { 63 t.Errorf("expected %s, got %s", testCase.expected, out.String()) 64 } 65 }) 66 } 67 } 68
