test(plugin): add test for AssetMapper

src/purgecss/__tests__/mapper.js

@@ -0,0 +1,53 @@
+import { options } from '../../util'
+import { mountModule, mountOptions } from '../../../test/utils'
+import { AssetMapper } from '../mapper'
+
+jest.mock('fs')
+mountOptions()
+
+describe('Mapper', () => {
+  const _pub = options._public
+  mountModule(`${_pub}/webpack.stats.json`, {
+    assetsByChunkName: {
+      app: ['foo.js'],
+      polyfill: ['bar.js', '/lib.js']
+    }
+  })
+
+  it('correctly loads default ignored files', () => {
+    let mapper
+    expect(() => { mapper = new AssetMapper() }).not.toThrow()
+    expect(mapper.shouldIgnoreFile(`${_pub}/foo.js`)).toBe(true)
+    expect(mapper.shouldIgnoreFile(`${_pub}/other/bar.js`)).toBe(false)
+  })
+
+  it('correctly loads custom ignored files as per options', () => {
+    mountOptions({
+      ignoreFiles: {
+        webpack: ['polyfill'],
+        pages: ['/about'],
+        css: ['foo.css'],
+        js: ['scripts/bar.js'],
+      }
+    })
+    let mapper
+    expect(() => { mapper = new AssetMapper() }).not.toThrow()
+    expect(mapper.shouldIgnoreFile(`${_pub}/foo.js`)).toBe(false)
+    expect(mapper.shouldIgnoreFile(`${_pub}/about/index.html`)).toBe(true)
+    expect(mapper.shouldIgnoreFile(`${_pub}/scripts/bar.js`)).toBe(true)
+    expect(mapper.shouldIgnoreFile(`${_pub}/foo.png`)).toBe(false)
+    expect(mapper.shouldIgnoreFile(`foo.css`)).toBe(false)
+    expect(mapper.shouldIgnoreFile(`foo`)).toBe(false)
+  })
+
+  it('correctly links styles with file objects', () => {
+    const files = [{a: 1}, {b: 2}]
+    let mapper
+    expect(() => {
+      mapper = new AssetMapper()
+      mapper.linkStyleToFile('id', files[0])
+      mapper.linkStyleToFile('id', files[1])
+    }).not.toThrow()
+    expect(mapper.getStyleLinks('id')).toMatchObject(files)
+  })
+})