| 1 | // SPDX-License-Identifier: GPL-3.0-or-later |
| 2 | |
| 3 | package strmutil |
| 4 | |
| 5 | import ( |
| 6 | "strings" |
| 7 | "testing" |
| 8 | |
| 9 | "github.com/stretchr/testify/assert" |
| 10 | ) |
| 11 | |
| 12 | func TestTruncateText(t *testing.T) { |
| 13 | tests := map[string]struct { |
| 14 | input string |
| 15 | maxLen int |
| 16 | expected string |
| 17 | }{ |
| 18 | "short text unchanged": { |
| 19 | input: "hello", |
| 20 | maxLen: 100, |
| 21 | expected: "hello", |
| 22 | }, |
| 23 | "text exactly at limit": { |
| 24 | input: "hello", |
| 25 | maxLen: 5, |
| 26 | expected: "hello", |
| 27 | }, |
| 28 | "text truncated with ellipsis": { |
| 29 | input: "hello world", |
| 30 | maxLen: 8, |
| 31 | expected: "hello...", |
| 32 | }, |
| 33 | "empty string": { |
| 34 | input: "", |
| 35 | maxLen: 100, |
| 36 | expected: "", |
| 37 | }, |
| 38 | "UTF-8 characters preserved": { |
| 39 | input: "日本語テスト", |
| 40 | maxLen: 13, // 3 chars * 3 bytes each = 9 bytes + "..." = 12 bytes fits in 13 |
| 41 | expected: "日本語...", |
| 42 | }, |
| 43 | "mixed UTF-8 and ASCII": { |
| 44 | input: "hello世界test", |
| 45 | maxLen: 13, // "hello" (5) + "世" (3) + "界" (3) = 11 bytes + "..." = 14, so truncate to fit |
| 46 | expected: "hello世...", |
| 47 | }, |
| 48 | "very small maxLen": { |
| 49 | input: "hello", |
| 50 | maxLen: 4, // only room for 1 char + "..." |
| 51 | expected: "h...", |
| 52 | }, |
| 53 | "emoji handling": { |
| 54 | input: "test🚀emoji", |
| 55 | maxLen: 8, // "test" (4) + "..." (3) = 7 bytes fits in 8 |
| 56 | expected: "test...", |
| 57 | }, |
| 58 | "maxLen zero": { |
| 59 | input: "hello", |
| 60 | maxLen: 0, |
| 61 | expected: "", |
| 62 | }, |
| 63 | "maxLen negative": { |
| 64 | input: "hello", |
| 65 | maxLen: -1, |
| 66 | expected: "", |
| 67 | }, |
| 68 | "maxLen one ASCII": { |
| 69 | input: "hello", |
| 70 | maxLen: 1, |
| 71 | expected: "h", |
| 72 | }, |
| 73 | "maxLen two ASCII": { |
| 74 | input: "hello", |
| 75 | maxLen: 2, |
| 76 | expected: "he", |
| 77 | }, |
| 78 | "maxLen one UTF-8 too small": { |
| 79 | input: "日本語", // each char is 3 bytes |
| 80 | maxLen: 1, // can't fit any full rune |
| 81 | expected: "", |
| 82 | }, |
| 83 | "maxLen two UTF-8 too small": { |
| 84 | input: "日本語", |
| 85 | maxLen: 2, // still can't fit a 3-byte rune |
| 86 | expected: "", |
| 87 | }, |
| 88 | "maxLen three with long text": { |
| 89 | input: "日本語", |
| 90 | maxLen: 3, // only room for ellipsis, no content |
| 91 | expected: "...", |
| 92 | }, |
| 93 | } |
| 94 | |
| 95 | for name, tc := range tests { |
| 96 | t.Run(name, func(t *testing.T) { |
| 97 | result := TruncateText(tc.input, tc.maxLen) |
| 98 | assert.Equal(t, tc.expected, result) |
| 99 | }) |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | func TestTruncateText_LongQuery(t *testing.T) { |
| 104 | // Simulate a real SQL query scenario |
| 105 | longQuery := strings.Repeat("SELECT * FROM table WHERE id = ?; ", 200) |
| 106 | result := TruncateText(longQuery, 4096) |
| 107 | |
| 108 | assert.LessOrEqual(t, len(result), 4096) |
| 109 | assert.True(t, strings.HasSuffix(result, "...")) |
| 110 | } |