Add the first test case!

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

__tests__/index.test.js

@@ -0,0 +1,47 @@
+const index = require('../GitGitGadget/index')
+
+process.env['GITHUB_WEBHOOK_SECRET'] = 'for-testing'
+
+test('reject requests other than webhook payloads', async () => {
+    const context = {
+        log: jest.fn(),
+        req: {
+            method: 'GET',
+            headers: {
+                'content-type': 'text/plain'
+            }
+        },
+        done: jest.fn()
+    }
+
+    const expectInvalidWebhook = async (message) => {
+        context.log.mockClear()
+        context.done.mockClear()
+        expect(await index(context, context.req)).toBeUndefined()
+        expect(context.log).toHaveBeenCalledTimes(1)
+        expect(context.log.mock.calls[0][0]).toEqual(`Caught Error: ${message}`)
+        expect(context.res).toEqual({
+            body: `Not a valid GitHub webhook: Error: ${message}`,
+            status: 403
+        })
+        expect(context.done).toHaveBeenCalledTimes(1)
+    }
+
+    await expectInvalidWebhook('Unexpected content type: text/plain')
+
+    context.req.method = 'POST'
+    context.req.headers = {
+        'content-type': 'text/plain'
+    }
+    await expectInvalidWebhook('Unexpected content type: text/plain')
+
+    context.req.headers['content-type'] = 'application/json'
+    await expectInvalidWebhook('Missing X-Hub-Signature')
+
+    context.req.headers['x-hub-signature'] = 'invalid'
+    await expectInvalidWebhook('Unexpected X-Hub-Signature format: invalid')
+
+    context.req.headers['x-hub-signature'] = 'sha1=incorrect'
+    context.req.rawBody = '# empty'
+    await expectInvalidWebhook('Incorrect X-Hub-Signature')
+})