test: add unit tests for plan-parser module

__tests__/plan-parser.test.ts

@@ -0,0 +1,160 @@
+import { describe, it, expect } from 'vitest'
+import { parsePlanSteps, isPlanContent } from '@/lib/plan-parser'
+
+describe('parsePlanSteps', () => {
+  it('returns empty array for plain prose', () => {
+    const text = 'This is just a regular paragraph with no numbered steps.'
+    expect(parsePlanSteps(text)).toEqual([])
+  })
+
+  it('returns empty array for text with fewer than a full step', () => {
+    const text = 'Here is some context about the plan.'
+    expect(parsePlanSteps(text)).toEqual([])
+  })
+
+  it('parses a simple numbered list', () => {
+    const text = `1. Create the component
+2. Add styling
+3. Write tests`
+    const steps = parsePlanSteps(text)
+    expect(steps).toHaveLength(3)
+    expect(steps[0].title).toBe('Create the component')
+    expect(steps[1].title).toBe('Add styling')
+    expect(steps[2].title).toBe('Write tests')
+  })
+
+  it('parses bold titles', () => {
+    const text = `1. **Initialize project**
+2. **Set up database**
+3. **Deploy to production**`
+    const steps = parsePlanSteps(text)
+    expect(steps).toHaveLength(3)
+    expect(steps[0].title).toBe('Initialize project')
+    expect(steps[1].title).toBe('Set up database')
+    expect(steps[2].title).toBe('Deploy to production')
+  })
+
+  it('splits title and inline description on em dash', () => {
+    const text = `1. **Init** — create the directory structure
+2. **Build** — compile TypeScript to JavaScript
+3. **Test** — run the full test suite`
+    const steps = parsePlanSteps(text)
+    expect(steps).toHaveLength(3)
+    expect(steps[0].title).toBe('**Init**')
+    expect(steps[0].description).toContain('create the directory structure')
+    expect(steps[1].title).toBe('**Build**')
+    expect(steps[2].title).toBe('**Test**')
+  })
+
+  it('extracts file paths from backtick-wrapped tokens', () => {
+    const text = `1. Update the config
+   Modify \`lib/config.ts\` and \`src/app.tsx\`
+2. Add tests
+   Create \`__tests__/config.test.ts\`
+3. Update docs
+   Edit \`README.md\``
+    const steps = parsePlanSteps(text)
+    expect(steps).toHaveLength(3)
+    expect(steps[0].files).toEqual(['lib/config.ts', 'src/app.tsx'])
+    expect(steps[1].files).toEqual(['__tests__/config.test.ts'])
+    expect(steps[2].files).toEqual(['README.md'])
+  })
+
+  it('deduplicates file paths', () => {
+    const text = `1. Fix the bug
+   Update \`lib/utils.ts\` and then check \`lib/utils.ts\` again
+2. Verify
+   Run tests
+3. Commit
+   Stage changes`
+    const steps = parsePlanSteps(text)
+    expect(steps[0].files).toEqual(['lib/utils.ts'])
+  })
+
+  it('assigns sequential step IDs', () => {
+    const text = `1. First step
+2. Second step
+3. Third step`
+    const steps = parsePlanSteps(text)
+    expect(steps[0].id).toBe('step-1')
+    expect(steps[1].id).toBe('step-2')
+    expect(steps[2].id).toBe('step-3')
+  })
+
+  it('sets all steps to pending status', () => {
+    const text = `1. Step one
+2. Step two
+3. Step three`
+    const steps = parsePlanSteps(text)
+    for (const step of steps) {
+      expect(step.status).toBe('pending')
+    }
+  })
+
+  it('removes trailing colons from titles', () => {
+    const text = `1. Setup:
+   Install dependencies
+2. Configure:
+   Set environment variables
+3. Deploy:
+   Push to production`
+    const steps = parsePlanSteps(text)
+    expect(steps[0].title).toBe('Setup')
+    expect(steps[1].title).toBe('Configure')
+    expect(steps[2].title).toBe('Deploy')
+  })
+
+  it('handles indented description lines', () => {
+    const text = `1. Create component
+   This will be the main entry point
+   It should handle all user interactions
+2. Style it
+   Use CSS modules
+3. Export it
+   From the index barrel`
+    const steps = parsePlanSteps(text)
+    expect(steps[0].description).toContain('main entry point')
+    expect(steps[0].description).toContain('user interactions')
+  })
+
+  it('filters out non-file-path backtick content', () => {
+    const text = `1. Run setup
+   Execute \`npm install\` and \`pnpm build\`
+   Then check \`src/index.ts\`
+2. Verify
+   Check output
+3. Done
+   All clear`
+    const steps = parsePlanSteps(text)
+    // npm install and pnpm build should be filtered (start with npm/pnpm)
+    expect(steps[0].files).toEqual(['src/index.ts'])
+  })
+})
+
+describe('isPlanContent', () => {
+  it('returns false for text with fewer than 3 steps', () => {
+    const text = `1. First step
+2. Second step`
+    expect(isPlanContent(text)).toBe(false)
+  })
+
+  it('returns true for text with 3 or more steps', () => {
+    const text = `1. First step
+2. Second step
+3. Third step`
+    expect(isPlanContent(text)).toBe(true)
+  })
+
+  it('returns false for plain prose', () => {
+    expect(isPlanContent('Just a regular message with no plan.')).toBe(false)
+  })
+
+  it('returns true for a long plan', () => {
+    const text = `1. Initialize
+2. Configure
+3. Build
+4. Test
+5. Deploy`
+    expect(isPlanContent(text)).toBe(true)
+  })
+})