Add dedicated load-skills test coverage

sdk/src/__tests__/load-skills.test.ts

@@ -0,0 +1,271 @@
+import { afterEach, beforeEach, describe, expect, mock, spyOn, test } from 'bun:test'
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'fs'
+import os from 'os'
+import path from 'path'
+
+import {
+  SKILL_FILE_NAME,
+  SKILL_NAME_MAX_LENGTH,
+} from '@codebuff/common/constants/skills'
+
+import { loadSkills } from '../skills/load-skills'
+
+const writeSkill = ({
+  skillsRoot,
+  skillDirName,
+  frontmatterName = skillDirName,
+  description = `Description for ${skillDirName}`,
+  body = `# ${skillDirName}\n`,
+}: {
+  skillsRoot: string
+  skillDirName: string
+  frontmatterName?: string
+  description?: string
+  body?: string
+}): string => {
+  const skillDir = path.join(skillsRoot, skillDirName)
+  const skillFile = path.join(skillDir, SKILL_FILE_NAME)
+
+  mkdirSync(skillDir, { recursive: true })
+  writeFileSync(
+    skillFile,
+    [
+      '---',
+      `name: ${frontmatterName}`,
+      `description: ${description}`,
+      '---',
+      '',
+      body,
+    ].join('\n'),
+    'utf8',
+  )
+
+  return skillFile
+}
+
+describe('loadSkills', () => {
+  let tempRoot: string
+  let homeDir: string
+  let projectDir: string
+
+  beforeEach(() => {
+    tempRoot = mkdtempSync(path.join(os.tmpdir(), 'codebuff-sdk-load-skills-'))
+    homeDir = path.join(tempRoot, 'home')
+    projectDir = path.join(tempRoot, 'project')
+
+    mkdirSync(homeDir, { recursive: true })
+    mkdirSync(projectDir, { recursive: true })
+
+    spyOn(os, 'homedir').mockReturnValue(homeDir)
+  })
+
+  afterEach(() => {
+    mock.restore()
+    rmSync(tempRoot, { recursive: true, force: true })
+  })
+
+  test('discovers valid skills from all default search roots', async () => {
+    writeSkill({
+      skillsRoot: path.join(homeDir, '.claude', 'skills'),
+      skillDirName: 'global-claude-skill',
+    })
+    writeSkill({
+      skillsRoot: path.join(homeDir, '.agents', 'skills'),
+      skillDirName: 'global-agents-skill',
+    })
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.claude', 'skills'),
+      skillDirName: 'project-claude-skill',
+    })
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.agents', 'skills'),
+      skillDirName: 'project-agents-skill',
+    })
+
+    const skills = await loadSkills({ cwd: projectDir })
+
+    expect(Object.keys(skills).sort()).toEqual([
+      'global-agents-skill',
+      'global-claude-skill',
+      'project-agents-skill',
+      'project-claude-skill',
+    ])
+    expect(skills['global-claude-skill']?.filePath).toBe(
+      path.join(homeDir, '.claude', 'skills', 'global-claude-skill', 'SKILL.md'),
+    )
+    expect(skills['project-agents-skill']?.description).toBe(
+      'Description for project-agents-skill',
+    )
+  })
+
+  test('loads skills from an explicit skillsPath only', async () => {
+    const explicitSkillsDir = path.join(tempRoot, 'custom-skills')
+
+    writeSkill({
+      skillsRoot: explicitSkillsDir,
+      skillDirName: 'custom-skill',
+      description: 'Loaded from explicit skillsPath',
+    })
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.agents', 'skills'),
+      skillDirName: 'project-skill',
+      description: 'Should be ignored when skillsPath is set',
+    })
+
+    const skills = await loadSkills({
+      cwd: projectDir,
+      skillsPath: explicitSkillsDir,
+    })
+
+    expect(Object.keys(skills)).toEqual(['custom-skill'])
+    expect(skills['custom-skill']?.description).toBe(
+      'Loaded from explicit skillsPath',
+    )
+  })
+
+  test('applies override precedence as project over global and .agents over .claude', async () => {
+    writeSkill({
+      skillsRoot: path.join(homeDir, '.claude', 'skills'),
+      skillDirName: 'shared-skill',
+      description: 'global claude',
+    })
+    writeSkill({
+      skillsRoot: path.join(homeDir, '.agents', 'skills'),
+      skillDirName: 'shared-skill',
+      description: 'global agents',
+    })
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.claude', 'skills'),
+      skillDirName: 'shared-skill',
+      description: 'project claude',
+    })
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.agents', 'skills'),
+      skillDirName: 'shared-skill',
+      description: 'project agents',
+    })
+
+    const skills = await loadSkills({ cwd: projectDir })
+
+    expect(skills['shared-skill']?.description).toBe('project agents')
+    expect(skills['shared-skill']?.filePath).toBe(
+      path.join(projectDir, '.agents', 'skills', 'shared-skill', 'SKILL.md'),
+    )
+  })
+
+  test('prefers project .claude skills over global .agents skills', async () => {
+    writeSkill({
+      skillsRoot: path.join(homeDir, '.agents', 'skills'),
+      skillDirName: 'priority-skill',
+      description: 'global agents',
+    })
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.claude', 'skills'),
+      skillDirName: 'priority-skill',
+      description: 'project claude',
+    })
+
+    const skills = await loadSkills({ cwd: projectDir })
+
+    expect(skills['priority-skill']?.description).toBe('project claude')
+  })
+
+  test('skips invalid skill directories and malformed skill definitions', async () => {
+    const skillsRoot = path.join(projectDir, '.agents', 'skills')
+    const consoleError = spyOn(console, 'error').mockImplementation(() => { })
+    const consoleWarn = spyOn(console, 'warn').mockImplementation(() => { })
+
+    mkdirSync(path.join(skillsRoot, 'missing-skill-file'), { recursive: true })
+
+    const malformedDir = path.join(skillsRoot, 'malformed-frontmatter')
+    mkdirSync(malformedDir, { recursive: true })
+    writeFileSync(
+      path.join(malformedDir, 'SKILL.md'),
+      ['---', '{invalid yaml: [unclosed', '---'].join('\n'),
+      'utf8',
+    )
+
+    writeSkill({
+      skillsRoot,
+      skillDirName: 'mismatch-dir',
+      frontmatterName: 'different-name',
+      description: 'Mismatched name',
+    })
+
+    const tooLongName = 'a'.repeat(SKILL_NAME_MAX_LENGTH + 1)
+    writeSkill({
+      skillsRoot,
+      skillDirName: tooLongName,
+      description: 'Too long',
+    })
+
+    writeSkill({
+      skillsRoot,
+      skillDirName: 'Uppercase-Skill',
+      description: 'Uppercase invalid',
+    })
+    writeSkill({
+      skillsRoot,
+      skillDirName: 'special_skill',
+      description: 'Special char invalid',
+    })
+    writeSkill({
+      skillsRoot,
+      skillDirName: 'valid-skill',
+      description: 'Valid skill',
+    })
+
+    const skills = await loadSkills({ cwd: projectDir, verbose: true })
+
+    expect(Object.keys(skills)).toEqual(['valid-skill'])
+    expect(skills['valid-skill']?.description).toBe('Valid skill')
+
+    expect(consoleError).toHaveBeenCalledWith(
+      expect.stringContaining('Invalid frontmatter in skill file'),
+    )
+    expect(consoleError).toHaveBeenCalledWith(
+      expect.stringContaining(
+        "Skill name 'different-name' does not match directory name 'mismatch-dir'",
+      ),
+    )
+    expect(consoleWarn).toHaveBeenCalledWith(
+      `Skipping invalid skill directory name: ${tooLongName}`,
+    )
+    expect(consoleWarn).toHaveBeenCalledWith(
+      'Skipping invalid skill directory name: Uppercase-Skill',
+    )
+    expect(consoleWarn).toHaveBeenCalledWith(
+      'Skipping invalid skill directory name: special_skill',
+    )
+  })
+
+  test('loads skills from skillsPath and bypasses default search roots', async () => {
+    const customSkillsDir = path.join(tempRoot, 'custom-skills')
+    mkdirSync(customSkillsDir, { recursive: true })
+
+    // Put a skill in a default root that should NOT be found
+    writeSkill({
+      skillsRoot: path.join(projectDir, '.agents', 'skills'),
+      skillDirName: 'default-skill',
+      description: 'Should not be found',
+    })
+
+    // Put a skill in the custom directory that SHOULD be found
+    writeSkill({
+      skillsRoot: customSkillsDir,
+      skillDirName: 'custom-skill',
+      description: 'Found via skillsPath',
+    })
+
+    const skills = await loadSkills({
+      cwd: projectDir,
+      skillsPath: customSkillsDir,
+    })
+
+    expect(Object.keys(skills).sort()).toEqual(['custom-skill'])
+    expect(skills['custom-skill']?.description).toBe('Found via skillsPath')
+    expect(skills['custom-skill']?.filePath).toBe(
+      path.join(customSkillsDir, 'custom-skill', 'SKILL.md'),
+    )
+  })
+})