test: add clean-pip tests

__tests__/clean-pip.test.ts

@@ -0,0 +1,42 @@
+import * as core from '@actions/core';
+import * as exec from '@actions/exec';
+import {cleanPipPackages} from '../src/clean-pip';
+
+describe('cleanPipPackages', () => {
+  let infoSpy: jest.SpyInstance;
+  let setFailedSpy: jest.SpyInstance;
+  let execSpy: jest.SpyInstance;
+
+  beforeEach(() => {
+    infoSpy = jest.spyOn(core, 'info');
+    infoSpy.mockImplementation(() => undefined);
+
+    setFailedSpy = jest.spyOn(core, 'setFailed');
+    setFailedSpy.mockImplementation(() => undefined);
+
+    execSpy = jest.spyOn(exec, 'exec');
+    execSpy.mockImplementation(() => Promise.resolve(0));
+  });
+
+  afterEach(() => {
+    jest.resetAllMocks();
+    jest.clearAllMocks();
+  });
+
+  it('should successfully clean up pip packages', async () => {
+    await cleanPipPackages();
+
+    expect(execSpy).toHaveBeenCalledWith('bash', expect.any(Array));
+    expect(setFailedSpy).not.toHaveBeenCalled();
+  });
+
+  it('should handle errors and set failed status', async () => {
+    const error = new Error('Exec failed');
+    execSpy.mockImplementation(() => Promise.reject(error));
+
+    await cleanPipPackages();
+
+    expect(execSpy).toHaveBeenCalledWith('bash', expect.any(Array));
+    expect(setFailedSpy).toHaveBeenCalledWith('Failed to clean up pip packages.');
+  });
+});