test: Add integration testing

__tests__/main.test.ts

@@ -0,0 +1,59 @@
+import * as main from '../src/main';
+const nock = require('nock');
+// import {FetchError} from 'node-fetch';
+import jsonTestBrew from './data/brew.json';
+// import jsonTestGithub from './data/github.json';
+
+jest.setTimeout(30000);
+const repo: string = 'hugo';
+
+beforeEach(() => {
+  jest.resetModules();
+});
+
+afterEach(() => {
+  delete process.env['INPUT_HUGO-VERSION'];
+  nock.cleanAll();
+});
+
+describe('Integration testing run()', () => {
+  test('succeed in installing a custom version', async () => {
+    const testVersion: string = '0.61.0';
+    process.env['INPUT_HUGO-VERSION'] = testVersion;
+    const result: main.actionResult = await main.run();
+    expect(result.exitcode).toBe(0);
+    expect(result.output).toMatch(`Hugo Static Site Generator v${testVersion}`);
+  });
+
+  test('succeed in installing the latest version', async () => {
+    const testVersion: string = 'latest';
+    process.env['INPUT_HUGO-VERSION'] = testVersion;
+    nock('https://formulae.brew.sh')
+      .get(`/api/formula/${repo}.json`)
+      .reply(200, jsonTestBrew);
+    const result: main.actionResult = await main.run();
+    expect(result.exitcode).toBe(0);
+    expect(result.output).toMatch('Hugo Static Site Generator v0.62.2');
+  });
+});
+
+describe('showVersion()', () => {
+  let result: main.actionResult = {
+    exitcode: 0,
+    output: ''
+  };
+
+  test('return version', async () => {
+    result = await main.showVersion('git', ['--version']);
+    expect(result.exitcode).toBe(0);
+    expect(result.output).toMatch(/git version/);
+  });
+
+  test('return exception', async () => {
+    try {
+      result = await main.showVersion('gitgit', ['--version']);
+    } catch (e) {
+      expect(e).toThrow(Error);
+    }
+  });
+});