add testcases

packages/thumbnail-handler/test/fixtures/findThumbnail.html

@@ -0,0 +1,9 @@
+<DIV class="page" id="readability-page-1">
+    <img src="https://omnivore.app/small.png" alt="small image" />
+
+    <img src="https://omnivore.app/large_and_square.png" alt="large and square image" />
+
+    <img src="https://omnivore.app/wide.png" alt="wide image" />
+
+    <img src="https://omnivore.app/sprite.png" alt="sprite image" />
+</DIV>

packages/thumbnail-handler/test/index.test.ts

@@ -0,0 +1,30 @@
+import { expect } from 'chai'
+import fs from 'fs'
+import 'mocha'
+import nock from 'nock'
+import path from 'path'
+import { findThumbnail } from '../src'
+
+describe('findThumbnail', () => {
+  it('finds the largest and squarest image', async () => {
+    const images = ['large_and_square', 'small', 'sprite', 'wide']
+    // mock getting image by url
+    images.forEach((image) => {
+      nock('https://omnivore.app')
+        .get(`/${image}.png`)
+        .replyWithFile(200, path.join(__dirname, 'fixtures', `${image}.png`))
+    })
+    // get html content from file
+    const content = fs.readFileSync(
+      path.join(__dirname, 'fixtures', 'findThumbnail.html'),
+      'utf8'
+    )
+    // find thumbnail
+    const thumbnail = await findThumbnail(content)
+
+    expect(thumbnail).to.eql('https://omnivore.app/large_and_square.png')
+
+    // clean up
+    nock.cleanAll()
+  })
+})

packages/thumbnail-handler/test/stub.test.ts

@@ -1,8 +0,0 @@
-import 'mocha'
-import { expect } from 'chai'
-
-describe('stub test', () => {
-  it('should pass', () => {
-    expect(true).to.be.true
-  })
-})