1 package format_test
2
3 import (
4 "testing"
5
6 "gotest.tools/v3/assert"
7 "gotest.tools/v3/golden"
8 "gotest.tools/v3/internal/format"
9 )
10
11 func TestUnifiedDiff(t *testing.T) {
12 var testcases = []struct {
13 name string
14 a string
15 b string
16 expected string
17 from string
18 to string
19 }{
20 {
21 name: "empty diff",
22 a: "a\nb\nc",
23 b: "a\nb\nc",
24 from: "from",
25 to: "to",
26 },
27 {
28 name: "one diff with header",
29 a: "a\nxyz\nc",
30 b: "a\nb\nc",
31 from: "from",
32 to: "to",
33 expected: "one-diff-with-header.golden",
34 },
35 {
36 name: "many diffs",
37 a: "a123\nxyz\nc\nbaba\nz\nt\nj2j2\nok\nok\ndone\n",
38 b: "a123\nxyz\nc\nabab\nz\nt\nj2j2\nok\nok\n",
39 expected: "many-diff.golden",
40 },
41 {
42 name: "no trailing newline",
43 a: "a123\nxyz\nc\nbaba\nz\nt\nj2j2\nok\nok\ndone\n",
44 b: "a123\nxyz\nc\nabab\nz\nt\nj2j2\nok\nok",
45 expected: "many-diff-no-trailing-newline.golden",
46 },
47 {
48 name: "whitespace diff",
49 a: " something\n something\n \v\r\n",
50 b: " something\n\tsomething\n \n",
51 expected: "whitespace-diff.golden",
52 },
53 }
54
55 for _, testcase := range testcases {
56 t.Run(testcase.name, func(t *testing.T) {
57 diff := format.UnifiedDiff(format.DiffConfig{
58 A: testcase.a,
59 B: testcase.b,
60 From: testcase.from,
61 To: testcase.to,
62 })
63
64 if testcase.expected != "" {
65 assert.Assert(t, golden.String(diff, testcase.expected))
66 return
67 }
68 assert.Equal(t, diff, "")
69 })
70 }
71 }
72
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