add test case for running a command and positional arg handling

Signed-off-by: aramissennyeydd <aramis.sennyey@doordash.com>

packages/cli/src/wiring/CliInitializer.test.ts

@@ -0,0 +1,99 @@
+/*
+ * Copyright 2025 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { CliInitializer } from './CliInitializer';
+import { createCliPlugin } from './factory';
+
+process.exit = jest.fn() as any;
+
+describe('CliInitializer', () => {
+  beforeEach(() => {
+    jest.resetAllMocks();
+  });
+  it('should run commands', async () => {
+    expect.assertions(2);
+    process.argv = ['node', 'cli', 'test'];
+    const initializer = new CliInitializer();
+    initializer.add(
+      createCliPlugin({
+        pluginId: 'test',
+        init: async reg =>
+          reg.addCommand({
+            path: ['test'],
+            description: 'test',
+            execute: ({ args }) => {
+              expect(args).toEqual([]);
+              return Promise.resolve();
+            },
+          }),
+      }),
+    );
+    await initializer.run();
+    expect(process.exit).toHaveBeenCalledWith(0);
+  });
+
+  it('should pass positional args to the subcommand', async () => {
+    expect.assertions(2);
+    process.argv = ['node', 'cli', 'test', '[positional]', '<arg>'];
+    const initializer = new CliInitializer();
+    initializer.add(
+      createCliPlugin({
+        pluginId: 'test',
+        init: async reg =>
+          reg.addCommand({
+            path: ['test'],
+            description: 'test',
+            execute: ({ args }) => {
+              expect(args).toEqual(['[positional]', '<arg>']);
+              return Promise.resolve();
+            },
+          }),
+      }),
+    );
+    await initializer.run();
+    expect(process.exit).toHaveBeenCalledWith(0);
+  });
+
+  it('should pass positional args to the subcommand if nested', async () => {
+    expect.assertions(2);
+    process.argv = [
+      'node',
+      'cli',
+      'test',
+      'nested',
+      'command',
+      '[positional]',
+      '<arg>',
+    ];
+    const initializer = new CliInitializer();
+    initializer.add(
+      createCliPlugin({
+        pluginId: 'test',
+        init: async reg =>
+          reg.addCommand({
+            path: ['test', 'nested', 'command'],
+            description: 'test',
+            execute: ({ args }) => {
+              expect(args).toEqual(['[positional]', '<arg>']);
+              return Promise.resolve();
+            },
+          }),
+      }),
+    );
+    await initializer.run();
+    expect(process.exit).toHaveBeenCalledWith(0);
+  });
+});

packages/cli/src/wiring/CliInitializer.ts

@@ -17,7 +17,7 @@
 import { CommandGraph } from './CommandGraph';
 import { CliFeature, InternalCliFeature, InternalCliPlugin } from './types';
 import { CommandRegistry } from './CommandRegistry';
-import { program } from 'commander';
+import { Command } from 'commander';
 import { version } from '../lib/version';
 import chalk from 'chalk';
 import { exitWithError } from '../lib/errors';
@@ -61,6 +61,8 @@ export class CliInitializer {
    */
   async run() {
     await this.#doInit();
+
+    const program = new Command();
     program
       .name('backstage-cli')
       .version(version)