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src/services/markdownTable.test.ts

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+import { describe, expect, it } from 'vitest'
+import { extractMarkdownTable, splitMarkdownRow } from './markdownTable'
+
+describe('splitMarkdownRow', () => {
+  it('keeps pipes inside code spans and escaped pipes inside cells', () => {
+    expect(splitMarkdownRow('| A | `x | y` | left \\| right |')).toEqual([
+      'A',
+      '`x | y`',
+      'left \\| right',
+    ])
+  })
+
+  it('matches arbitrary backtick fence lengths and ignores escaped backticks', () => {
+    expect(splitMarkdownRow('| ``x | y`` | escaped \\` tick |')).toEqual([
+      '``x | y``',
+      'escaped \\` tick',
+    ])
+  })
+
+  it('treats an unmatched backtick as literal text', () => {
+    expect(splitMarkdownRow('| A | unmatched `code | B |')).toEqual([
+      'A',
+      'unmatched `code',
+      'B',
+    ])
+  })
+})
+
+describe('extractMarkdownTable', () => {
+  it('finds a table and gathers its contiguous body rows', () => {
+    const lines = [
+      'intro',
+      '| A | B |',
+      '| --- | :---: |',
+      '| 1 | 2 |',
+      '',
+    ]
+
+    expect(extractMarkdownTable(lines)).toEqual({
+      start: 1,
+      end: 3,
+      header: ['A', 'B'],
+      rows: [['1', '2']],
+    })
+  })
+
+  it.each([
+    ['backtick', ['```markdown', '| Fake | Table |', '| --- | --- |', '```']],
+    ['tilde', ['~~~~', '| Fake | Table |', '| --- | --- |', '~~~~']],
+  ])('skips pseudo-tables inside %s fenced code', (_marker, fencedLines) => {
+    const lines = [
+      ...fencedLines,
+      '',
+      '| Real | Table |',
+      '| --- | --- |',
+      '| 1 | 2 |',
+    ]
+    const realTableStart = fencedLines.length + 1
+
+    expect(extractMarkdownTable(lines)).toEqual({
+      start: realTableStart,
+      end: realTableStart + 2,
+      header: ['Real', 'Table'],
+      rows: [['1', '2']],
+    })
+  })
+
+  it.each([
+    ['four spaces', '    '],
+    ['a tab', '\t'],
+  ])('skips pseudo-tables indented with %s', (_indentation, indent) => {
+    const lines = [
+      `${indent}| Fake | Table |`,
+      `${indent}| --- | --- |`,
+      `${indent}| 0 | 0 |`,
+      '',
+      '| Real | Table |',
+      '| --- | --- |',
+      '| 1 | 2 |',
+    ]
+
+    expect(extractMarkdownTable(lines)).toEqual({
+      start: 4,
+      end: 6,
+      header: ['Real', 'Table'],
+      rows: [['1', '2']],
+    })
+  })
+
+  it('starts its table search at fromIndex', () => {
+    const lines = [
+      '| First | Table |',
+      '| --- | --- |',
+      '| 1 | 1 |',
+      '',
+      '| Second | Table |',
+      '| --- | --- |',
+      '| 2 | 2 |',
+    ]
+
+    expect(extractMarkdownTable(lines, 4)).toEqual({
+      start: 4,
+      end: 6,
+      header: ['Second', 'Table'],
+      rows: [['2', '2']],
+    })
+  })
+
+  it('returns null when no valid table exists', () => {
+    expect(extractMarkdownTable(['plain text'])).toBeNull()
+    expect(
+      extractMarkdownTable(['| A | B |', '| -- | not-a-divider |']),
+    ).toBeNull()
+  })
+})