Add support for VSCode-like editors (#5699)

Co-authored-by: Jacob Richman <jacob314@gmail.com>

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

@@ -24,9 +24,17 @@ describe('ide-installer', () => {
       expect(installer).toBeInstanceOf(Object);
     });
 
-    it('should return null for an unknown IDE', () => {
+    it('should return an OpenVSXInstaller for "vscodium"', () => {
+      const installer = getIdeInstaller(DetectedIde.VSCodium);
+      expect(installer).not.toBeNull();
+      expect(installer).toBeInstanceOf(Object);
+    });
+
+    it('should return a DefaultIDEInstaller for an unknown IDE', () => {
       const installer = getIdeInstaller('unknown' as DetectedIde);
-      expect(installer).toBeNull();
+      // Assuming DefaultIDEInstaller is the fallback
+      expect(installer).not.toBeNull();
+      expect(installer).toBeInstanceOf(Object);
     });
   });
 
@@ -59,4 +67,44 @@ describe('ide-installer', () => {
       });
     });
   });
+
+  describe('OpenVSXInstaller', () => {
+    let installer: IdeInstaller;
+
+    beforeEach(() => {
+      installer = getIdeInstaller(DetectedIde.VSCodium)!;
+    });
+
+    afterEach(() => {
+      vi.restoreAllMocks();
+    });
+
+    describe('install', () => {
+      it('should call execSync with the correct command and return success', async () => {
+        const execSyncSpy = vi
+          .spyOn(child_process, 'execSync')
+          .mockImplementation(() => '');
+        const result = await installer.install();
+        expect(execSyncSpy).toHaveBeenCalledWith(
+          'npx ovsx get google.gemini-cli-vscode-ide-companion',
+          { stdio: 'pipe' },
+        );
+        expect(result.success).toBe(true);
+        expect(result.message).toContain(
+          'VS Code companion extension was installed successfully from OpenVSX',
+        );
+      });
+
+      it('should return a failure message on failed installation', async () => {
+        vi.spyOn(child_process, 'execSync').mockImplementation(() => {
+          throw new Error('Command failed');
+        });
+        const result = await installer.install();
+        expect(result.success).toBe(false);
+        expect(result.message).toContain(
+          'Failed to install VS Code companion extension from OpenVSX',
+        );
+      });
+    });
+  });
 });