| // Copyright Istio Authors |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package util |
| |
| import ( |
| "errors" |
| "strings" |
| ) |
| |
| import ( |
| "github.com/pmezard/go-difflib/difflib" |
| ) |
| |
| // Compare compares two byte slices. It returns an error with a |
| // contextual diff if they are not equal. |
| func Compare(out, model []byte) error { |
| data := strings.TrimSpace(string(out)) |
| expected := strings.TrimSpace(string(model)) |
| |
| if data != expected { |
| diff := difflib.UnifiedDiff{ |
| A: difflib.SplitLines(expected), |
| B: difflib.SplitLines(data), |
| Context: 2, |
| } |
| text, err := difflib.GetUnifiedDiffString(diff) |
| if err != nil { |
| return err |
| } |
| return errors.New(text) |
| } |
| |
| return nil |
| } |