관리자 소스 선택 편집 계산 분리

tests/markdown-source-selection.test.js

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+import assert from 'node:assert/strict'
+import test from 'node:test'
+import {
+  deleteMarkdownSelectedLines,
+  getMarkdownLineIndexAtOffset,
+  getMarkdownLineStartOffset,
+  getMarkdownSelectionState,
+  insertMarkdownBlockSnippet,
+  insertMarkdownInlineLink,
+  replaceMarkdownSelection,
+  transformMarkdownSelectedLines,
+  wrapMarkdownInlineSelection
+} from '../lib/markdown-source-selection.js'
+
+test('마크다운 줄 오프셋과 줄 번호를 계산한다', () => {
+  const value = '첫 줄\n두 번째\n세 번째'
+
+  assert.equal(getMarkdownLineStartOffset(value, 0), 0)
+  assert.equal(getMarkdownLineStartOffset(value, 1), 4)
+  assert.equal(getMarkdownLineStartOffset(value, 9), 9)
+  assert.equal(getMarkdownLineIndexAtOffset(value, 0), 0)
+  assert.equal(getMarkdownLineIndexAtOffset(value, 5), 1)
+  assert.equal(getMarkdownLineIndexAtOffset(value, 100), 2)
+})
+
+test('textarea 선택 정보가 없으면 본문 끝을 선택 상태로 사용한다', () => {
+  assert.deepEqual(getMarkdownSelectionState({
+    value: '본문',
+    textarea: null
+  }), {
+    start: 2,
+    end: 2,
+    value: '본문'
+  })
+})
+
+test('선택 영역을 교체하고 다음 선택 범위를 반환한다', () => {
+  const result = replaceMarkdownSelection({
+    value: 'hello world',
+    start: 6,
+    end: 11,
+    replacement: 'link',
+    cursorOffset: 1,
+    selectionLength: 2
+  })
+
+  assert.deepEqual(result, {
+    value: 'hello link',
+    selectionStart: 7,
+    selectionEnd: 9
+  })
+})
+
+test('블록 조각 삽입은 앞뒤 줄바꿈을 보정한다', () => {
+  const result = insertMarkdownBlockSnippet({
+    value: '앞뒤',
+    start: 1,
+    end: 1,
+    snippet: '```\ncode\n```'
+  })
+
+  assert.equal(result.value, '앞\n\n```\ncode\n```\n\n뒤')
+  assert.equal(result.selectionStart, result.value.length - 1)
+})
+
+test('인라인 감싸기는 선택 텍스트를 유지하고 내부를 선택한다', () => {
+  const result = wrapMarkdownInlineSelection({
+    value: 'hello',
+    start: 0,
+    end: 5,
+    prefix: '**',
+    suffix: '**',
+    placeholder: '굵게'
+  })
+
+  assert.deepEqual(result, {
+    value: '**hello**',
+    selectionStart: 2,
+    selectionEnd: 7
+  })
+})
+
+test('링크 삽입은 URL 영역을 다음 선택 범위로 반환한다', () => {
+  const result = insertMarkdownInlineLink({
+    value: '링크',
+    start: 0,
+    end: 2
+  })
+
+  assert.deepEqual(result, {
+    value: '[링크](https://)',
+    selectionStart: 5,
+    selectionEnd: 13
+  })
+})
+
+test('선택된 여러 줄을 변환한다', () => {
+  const result = transformMarkdownSelectedLines({
+    value: 'a\nb\nc',
+    start: 0,
+    end: 3,
+    transformLine: (line) => `- ${line}`
+  })
+
+  assert.deepEqual(result, {
+    value: '- a\n- b\nc',
+    selectionStart: 0,
+    selectionEnd: 7
+  })
+})
+
+test('선택된 줄 전체를 삭제한다', () => {
+  const result = deleteMarkdownSelectedLines({
+    value: 'a\nb\nc',
+    start: 2,
+    end: 3
+  })
+
+  assert.deepEqual(result, {
+    value: 'a\nc',
+    selectionStart: 0,
+    selectionEnd: 0
+  })
+})