Introduce IDE mode installer (#4877)

packages/core/src/ide/ide-installer.test.ts

@@ -0,0 +1,90 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { vi, describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { getIdeInstaller, IdeInstaller } from './ide-installer.js';
+import * as child_process from 'child_process';
+import * as fs from 'fs';
+import * as os from 'os';
+import { DetectedIde } from './detect-ide.js';
+
+vi.mock('child_process');
+vi.mock('fs');
+vi.mock('os');
+
+describe('ide-installer', () => {
+  describe('getIdeInstaller', () => {
+    it('should return a VsCodeInstaller for "vscode"', () => {
+      const installer = getIdeInstaller(DetectedIde.VSCode);
+      expect(installer).not.toBeNull();
+      // A more specific check might be needed if we export the class
+      expect(installer).toBeInstanceOf(Object);
+    });
+
+    it('should return null for an unknown IDE', () => {
+      const installer = getIdeInstaller('unknown' as DetectedIde);
+      expect(installer).toBeNull();
+    });
+  });
+
+  describe('VsCodeInstaller', () => {
+    let installer: IdeInstaller;
+
+    beforeEach(() => {
+      // We get a new installer for each test to reset the find command logic
+      installer = getIdeInstaller(DetectedIde.VSCode)!;
+      vi.spyOn(child_process, 'execSync').mockImplementation(() => '');
+      vi.spyOn(fs, 'existsSync').mockReturnValue(false);
+      vi.spyOn(os, 'homedir').mockReturnValue('/home/user');
+    });
+
+    afterEach(() => {
+      vi.restoreAllMocks();
+    });
+
+    describe('isInstalled', () => {
+      it('should return true if command is in PATH', async () => {
+        expect(await installer.isInstalled()).toBe(true);
+      });
+
+      it('should return true if command is in a known location', async () => {
+        vi.spyOn(child_process, 'execSync').mockImplementation(() => {
+          throw new Error('Command not found');
+        });
+        vi.spyOn(fs, 'existsSync').mockReturnValue(true);
+        // Re-create the installer so it re-runs findVsCodeCommand
+        installer = getIdeInstaller(DetectedIde.VSCode)!;
+        expect(await installer.isInstalled()).toBe(true);
+      });
+
+      it('should return false if command is not found', async () => {
+        vi.spyOn(child_process, 'execSync').mockImplementation(() => {
+          throw new Error('Command not found');
+        });
+        vi.spyOn(fs, 'existsSync').mockReturnValue(false);
+        // Re-create the installer so it re-runs findVsCodeCommand
+        installer = getIdeInstaller(DetectedIde.VSCode)!;
+        expect(await installer.isInstalled()).toBe(false);
+      });
+    });
+
+    describe('install', () => {
+      it('should return a failure message if VS Code is not installed', async () => {
+        vi.spyOn(child_process, 'execSync').mockImplementation(() => {
+          throw new Error('Command not found');
+        });
+        vi.spyOn(fs, 'existsSync').mockReturnValue(false);
+        // Re-create the installer so it re-runs findVsCodeCommand
+        installer = getIdeInstaller(DetectedIde.VSCode)!;
+        const result = await installer.install();
+        expect(result.success).toBe(false);
+        expect(result.message).toContain(
+          'not found in your PATH or common installation locations',
+        );
+      });
+    });
+  });
+});