test: add tests for parse-basic-frontmatter

Author: 43081j

shared/utils/parse-basic-frontmatter.ts

@@ -2,33 +2,30 @@ export function parseBasicFrontmatter(fileContent: string): Record<string, unkno
   const match = fileContent.match(/^---\s*\n([\s\S]*?)\n---\s*(?:\n|$)/)
   if (!match?.[1]) return {}
 
-  return match[1].split('\n').reduce(
-    (acc, line) => {
-      const idx = line.indexOf(':')
-      if (idx === -1) return acc
+  return match[1].split('\n').reduce<Record<string, unknown>>((acc, line) => {
+    const idx = line.indexOf(':')
+    if (idx === -1) return acc
 
-      const key = line.slice(0, idx).trim()
+    const key = line.slice(0, idx).trim()
 
-      // Remove surrounding quotes
-      let value = line
-        .slice(idx + 1)
-        .trim()
-        .replace(/^["']|["']$/g, '')
+    // Remove surrounding quotes
+    let value = line
+      .slice(idx + 1)
+      .trim()
+      .replace(/^["']|["']$/g, '')
 
-      // Type coercion (handles 123, 45.6, boolean, arrays)
-      if (value === 'true') acc[key] = true
-      else if (value === 'false') acc[key] = false
-      else if (/^-?\d+$/.test(value)) acc[key] = parseInt(value, 10)
-      else if (/^-?\d+\.\d+$/.test(value)) acc[key] = parseFloat(value)
-      else if (value.startsWith('[') && value.endsWith(']')) {
-        acc[key] = value
-          .slice(1, -1)
-          .split(',')
-          .map(s => s.trim().replace(/^["']|["']$/g, ''))
-      } else acc[key] = value
+    // Type coercion (handles 123, 45.6, boolean, arrays)
+    if (value === 'true') acc[key] = true
+    else if (value === 'false') acc[key] = false
+    else if (/^-?\d+$/.test(value)) acc[key] = parseInt(value, 10)
+    else if (/^-?\d+\.\d+$/.test(value)) acc[key] = parseFloat(value)
+    else if (value.startsWith('[') && value.endsWith(']')) {
+      acc[key] = value
+        .slice(1, -1)
+        .split(',')
+        .map(s => s.trim().replace(/^["']|["']$/g, ''))
+    } else acc[key] = value
 
-      return acc
-    },
-    {} as Record<string, unknown>,
-  )
+    return acc
+  }, {})
 }

test/unit/shared/utils/parse-basic-frontmatter.spec.ts

@@ -0,0 +1,108 @@
+import { describe, expect, it } from 'vitest'
+import { parseBasicFrontmatter } from '../../../../shared/utils/parse-basic-frontmatter'
+
+describe('parseBasicFrontmatter', () => {
+  it('returns empty object for content without frontmatter', () => {
+    expect(parseBasicFrontmatter('just some text')).toEqual({})
+  })
+
+  it('returns empty object for empty string', () => {
+    expect(parseBasicFrontmatter('')).toEqual({})
+  })
+
+  it('returns empty object for empty frontmatter block', () => {
+    expect(parseBasicFrontmatter('---\n---\n')).toEqual({})
+  })
+
+  it('parses string values', () => {
+    const input = '---\ntitle: Hello World\nauthor: James\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      title: 'Hello World',
+      author: 'James',
+    })
+  })
+
+  it('strips surrounding quotes from values', () => {
+    const input = '---\ntitle: "Hello World"\nauthor: \'James\'\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      title: 'Hello World',
+      author: 'James',
+    })
+  })
+
+  it('parses boolean true', () => {
+    const input = '---\ndraft: true\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({ draft: true })
+  })
+
+  it('parses boolean false', () => {
+    const input = '---\ndraft: false\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({ draft: false })
+  })
+
+  it('parses integer values', () => {
+    const input = '---\ncount: 42\nnegative: -7\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({ count: 42, negative: -7 })
+  })
+
+  it('parses float values', () => {
+    const input = '---\nrating: 4.5\nnegative: -3.14\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({ rating: 4.5, negative: -3.14 })
+  })
+
+  it('parses array values', () => {
+    const input = '---\ntags: [foo, bar, baz]\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      tags: ['foo', 'bar', 'baz'],
+    })
+  })
+
+  it('strips quotes from array items', () => {
+    const input = '---\ntags: ["foo", \'bar\']\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      tags: ['foo', 'bar'],
+    })
+  })
+
+  it('does not support nested arrays', () => {
+    const input = '---\nmatrix: [[1, 2], [3, 4]]\n---\n'
+    const result = parseBasicFrontmatter(input)
+    expect(result.matrix).toEqual(['[1', '2]', '[3', '4]'])
+  })
+
+  it('handles values with colons', () => {
+    const input = '---\nurl: https://example.com\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      url: 'https://example.com',
+    })
+  })
+
+  it('skips lines without colons', () => {
+    const input = '---\ntitle: Hello\ninvalid line\nauthor: James\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      title: 'Hello',
+      author: 'James',
+    })
+  })
+
+  it('trims keys and values', () => {
+    const input = '---\n  title  :  Hello  \n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({ title: 'Hello' })
+  })
+
+  it('handles frontmatter at end of file without trailing newline', () => {
+    const input = '---\ntitle: Hello\n---'
+    expect(parseBasicFrontmatter(input)).toEqual({ title: 'Hello' })
+  })
+
+  it('handles mixed types', () => {
+    const input = '---\ntitle: My Post\ncount: 5\nrating: 9.8\npublished: true\ntags: [a, b]\n---\n'
+    expect(parseBasicFrontmatter(input)).toEqual({
+      title: 'My Post',
+      count: 5,
+      rating: 9.8,
+      published: true,
+      tags: ['a', 'b'],
+    })
+  })
+})