[Test] Add basic test for incoming integration

tests/end-to-end/api/07-incoming-integrations.js

+/* eslint-env mocha */
+
+import {getCredentials, api, request, credentials } from '../../data/api-data.js';
+
+describe('Incoming Integrations', function() {
+	this.retries(0);
+
+	let integration;
+
+	before(done => getCredentials(done));
+
+	before((done) => {
+		request.post(api('integrations.create'))
+			.set(credentials)
+			.send({
+				type: 'webhook-incoming',
+				name: 'Incoming test',
+				enabled: true,
+				username: 'rocket.cat',
+				scriptEnabled: false,
+				channel: '#general'
+			})
+			.expect('Content-Type', 'application/json')
+			.expect(200)
+			.expect((res) => {
+				integration = res.body.integration;
+			})
+			.end(done);
+	});
+
+	after((done) => {
+		request.post(api('integrations.remove'))
+			.set(credentials)
+			.send({
+				type: 'webhook-incoming',
+				integrationId: integration._id
+			})
+			.expect('Content-Type', 'application/json')
+			.expect(200)
+			.end(done);
+	});
+
+	it('should execute the incoming integration', (done) => {
+		request.post(`/hooks/${ integration._id }/${ integration.token }`)
+			.send({
+				text: 'Example message'
+			})
+			.expect(200)
+			.end(done);
+	});
+});