| // Copyright 2019 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package diff |
| |
| import ( |
| "reflect" |
| "strings" |
| "testing" |
| ) |
| |
| func TestDiff(t *testing.T) { |
| for _, test := range []struct { |
| a, b string |
| lines []*Op |
| operations []*Op |
| }{ |
| { |
| a: "A\nB\nC\nA\nB\nB\nA\n", |
| b: "C\nB\nA\nB\nA\nC\n", |
| operations: []*Op{ |
| &Op{Kind: Delete, I1: 0, I2: 1, J1: 0}, |
| &Op{Kind: Delete, I1: 1, I2: 2, J1: 0}, |
| &Op{Kind: Insert, Content: []string{"B\n"}, I1: 3, I2: 3, J1: 1}, |
| &Op{Kind: Delete, I1: 5, I2: 6, J1: 4}, |
| &Op{Kind: Insert, Content: []string{"C\n"}, I1: 7, I2: 7, J1: 5}, |
| }, |
| }, |
| { |
| a: "A\nB\n", |
| b: "A\nC\n\n", |
| operations: []*Op{ |
| &Op{Kind: Delete, I1: 1, I2: 2, J1: 1}, |
| &Op{Kind: Insert, Content: []string{"C\n"}, I1: 2, I2: 2, J1: 1}, |
| &Op{Kind: Insert, Content: []string{"\n"}, I1: 2, I2: 2, J1: 2}, |
| }, |
| }, |
| } { |
| a := strings.SplitAfter(test.a, "\n") |
| b := strings.SplitAfter(test.b, "\n") |
| ops := Operations(a, b) |
| if len(ops) != len(test.operations) { |
| t.Fatalf("expected %v operations, got %v", len(test.operations), len(ops)) |
| } |
| for i, got := range ops { |
| want := test.operations[i] |
| if !reflect.DeepEqual(want, got) { |
| t.Errorf("expected %v, got %v", want, got) |
| } |
| } |
| applied := ApplyEdits(a, test.operations) |
| for i, want := range applied { |
| got := b[i] |
| if got != want { |
| t.Errorf("expected %v got %v", want, got) |
| } |
| } |
| } |
| } |
