diff --git a/packages/vscode-ide-companion/README.md b/packages/vscode-ide-companion/README.md
index 2814255b..a5e4980d 100644
--- a/packages/vscode-ide-companion/README.md
+++ b/packages/vscode-ide-companion/README.md
@@ -40,10 +40,6 @@ To debug and develop this extension locally:
 
 3. **Start debugging**
 
-   You have two options:
-
-   **Option A: Debug from Project Root (Recommended)**
-
    ```bash
    code .  # Open the project root in VS Code
    ```
@@ -52,19 +48,6 @@ To debug and develop this extension locally:
    - Select **"Launch Companion VS Code Extension"** from the debug dropdown
    - Press `F5` to launch Extension Development Host
 
-   **Option B: Debug from Extension Directory**
-
-   ```bash
-   cd packages/vscode-ide-companion
-   code .  # Open the extension directory in VS Code
-   ```
-   - Open the `src/extension.ts` file
-   - Open Debug panel (`Ctrl+Shift+D` or `Cmd+Shift+D`)
-   - Select **"Run Extension"** from the debug dropdown
-   - Press `F5` to launch Extension Development Host
-
-   > 💡 **Tip**: Option A is recommended if you need to debug both the extension and core packages together.
-
 4. **Make changes and reload**
    - Edit the source code in the original VS Code window
    - To see your changes, reload the Extension Development Host window by:
diff --git a/packages/vscode-ide-companion/src/extension.test.ts b/packages/vscode-ide-companion/src/extension.test.ts
index 2560881d..31d5aa52 100644
--- a/packages/vscode-ide-companion/src/extension.test.ts
+++ b/packages/vscode-ide-companion/src/extension.test.ts
@@ -40,6 +40,9 @@ vi.mock('vscode', () => ({
     },
     showTextDocument: vi.fn(),
     showWorkspaceFolderPick: vi.fn(),
+    registerWebviewPanelSerializer: vi.fn(() => ({
+      dispose: vi.fn(),
+    })),
   },
   workspace: {
     workspaceFolders: [],