Initial attempt for e2e tests

- Add node code for e2e tests. This is a first take to try running
  these tests via actions.
- Relates to #401

e2e/spring-shell-e2e-tests/test/builtin.test.ts

@@ -0,0 +1,69 @@
+import 'jest-extended';
+import waitForExpect from 'wait-for-expect';
+import { Cli } from 'spring-shell-e2e';
+import { nativeDesc, jarDesc, jarCommand, nativeCommand, jarOptions } from '../src/utils';
+
+// all buildin commands
+describe('builtin commands', () => {
+  let cli: Cli;
+  let command: string;
+  let options: string[] = [];
+
+  /**
+   * test for version command returns expected info
+   */
+  const versionReturnsInfoDesc = 'version returns info';
+  const versionCommand = ['version'];
+  const versionReturnsInfo = async (cli: Cli) => {
+    cli.run();
+    await waitForExpect(async () => {
+      const screen = cli.screen();
+      expect(screen).toEqual(expect.arrayContaining([expect.stringContaining('Build Version')]));
+    });
+    await expect(cli.exitCode()).resolves.toBe(0);
+  };
+
+  beforeEach(async () => {
+    waitForExpect.defaults.timeout = 3000;
+    waitForExpect.defaults.interval = 100;
+  }, 300000);
+
+  afterEach(async () => {
+    cli?.dispose();
+  }, 100000);
+
+  /**
+   * native commands
+   */
+  describe(nativeDesc, () => {
+    beforeAll(() => {
+      command = nativeCommand;
+    });
+
+    it(versionReturnsInfoDesc, async () => {
+      cli = new Cli({
+        command: command,
+        options: [...options, ...versionCommand]
+      });
+      await versionReturnsInfo(cli);
+    });
+  });
+
+  /**
+   * fatjar commands
+   */
+  describe(jarDesc, () => {
+    beforeAll(() => {
+      command = jarCommand;
+      options = jarOptions;
+    });
+
+    it(versionReturnsInfoDesc, async () => {
+      cli = new Cli({
+        command: command,
+        options: [...options, ...versionCommand]
+      });
+      await versionReturnsInfo(cli);
+    });
+  });
+});

e2e/spring-shell-e2e-tests/test/flow.test.ts

@@ -0,0 +1,91 @@
+import 'jest-extended';
+import waitForExpect from 'wait-for-expect';
+import { Cli } from 'spring-shell-e2e';
+import { nativeDesc, jarDesc, jarCommand, nativeCommand, jarOptions } from '../src/utils';
+
+// all flow commands
+describe('flow commands', () => {
+  let cli: Cli;
+  let command: string;
+  let options: string[] = [];
+
+  /**
+   * test for flow conditional field2 skips field1
+   */
+  const flowConditionalField2SkipsFields1Desc = 'flow conditional field2 skips field1';
+  const flowConditionalCommand = ['flow', 'conditional'];
+  const flowConditionalField2SkipsFields1 = async (cli: Cli) => {
+    cli.run();
+
+    await waitForExpect(async () => {
+      const screen = cli.screen();
+      expect(screen).toEqual(expect.arrayContaining([expect.stringContaining('Single1')]));
+    });
+
+    await cli.keyDown();
+    await waitForExpect(async () => {
+      const screen = cli.screen();
+      expect(screen).toEqual(expect.arrayContaining([expect.stringContaining('> Field2')]));
+    });
+
+    await cli.keyEnter();
+    await waitForExpect(async () => {
+      const screen = cli.screen();
+      expect(screen).toEqual(
+        expect.arrayContaining([expect.stringContaining('? Field2 [Default defaultField2Value]')])
+      );
+    });
+
+    await cli.keyEnter();
+    await waitForExpect(async () => {
+      const screen = cli.screen();
+      expect(screen).toEqual(expect.arrayContaining([expect.stringContaining('Field2 defaultField2Value')]));
+    });
+
+    await expect(cli.exitCode()).resolves.toBe(0);
+  };
+
+  beforeEach(async () => {
+    waitForExpect.defaults.timeout = 3000;
+    waitForExpect.defaults.interval = 100;
+  }, 300000);
+
+  afterEach(async () => {
+    cli?.dispose();
+  }, 100000);
+
+  /**
+   * native commands
+   */
+  describe(nativeDesc, () => {
+    beforeAll(() => {
+      command = nativeCommand;
+    });
+
+    it(flowConditionalField2SkipsFields1Desc, async () => {
+      cli = new Cli({
+        command: command,
+        options: [...options, ...flowConditionalCommand]
+      });
+      await flowConditionalField2SkipsFields1(cli);
+    });
+  });
+
+  /**
+   * fatjar commands
+   */
+  describe(jarDesc, () => {
+    beforeAll(() => {
+      command = jarCommand;
+      options = jarOptions;
+    });
+
+    it(flowConditionalField2SkipsFields1Desc, async () => {
+      cli = new Cli({
+        command: command,
+        options: [...options, ...flowConditionalCommand]
+      });
+      await flowConditionalField2SkipsFields1(cli);
+    });
+  });
+});