Adding client tests (#170)

* Adding client tests

* Auto-package action

Co-authored-by: dangoslen <dangoslen@users.noreply.github.com>

__tests__/client.test.js

@@ -0,0 +1,61 @@
+jest.mock('node-fetch');
+
+const core = require('@actions/core')
+const fetch = require('node-fetch')
+const { Response } = jest.requireActual('node-fetch');
+const client = require('../src/client')
+
+describe('the client', () => {
+
+  afterAll(() => {
+    jest.restoreAllMocks()
+  })
+
+  beforeEach(() => {
+    jest.clearAllMocks()
+  })
+
+  prepareResponse = (body) => {
+    return Promise.resolve(new Response(body, { Headers: { 'Content-Type': 'application/json' } }))
+  }
+
+  it('should find the change file', async () => {
+    const files = [
+      {
+        "filename": "CHANGELOG.md",
+        "status": "modified",
+        "raw_url": "./path/to/CHANGELOG.md"
+      }
+    ]
+
+    fetch.mockReturnValueOnce(prepareResponse(JSON.stringify(files)))
+
+    const changelogFile = await client.findChangelog('token', 'repo', 1, 1, 'CHANGELOG.md')
+    expect(fetch).toHaveBeenCalled()
+    expect(changelogFile).toStrictEqual({
+      "filename": "CHANGELOG.md",
+      "status": "modified",
+      "raw_url": "./path/to/CHANGELOG.md"
+    })
+  })
+
+  it('should not find the change file', async () => {
+    const firstPage = [
+      {
+        "filename": "random.md",
+        "status": "modified",
+        "raw_url": "./path/to/random.md"
+      }
+    ]
+
+    const secondPage = []
+
+    fetch
+      .mockReturnValueOnce(prepareResponse(JSON.stringify(firstPage)))
+      .mockReturnValueOnce(prepareResponse(JSON.stringify(secondPage)))
+
+    const changelogFile = await client.findChangelog('token', 'repo', 1, 1, 'CHANGELOG.md')
+    expect(fetch).toHaveBeenCalledTimes(2)
+    expect(changelogFile).toBeUndefined()
+  })
+})