diff --git a/src/__mocks__/vscode.js b/src/__mocks__/vscode.js
index 2e8ed72..6c25b10 100644
--- a/src/__mocks__/vscode.js
+++ b/src/__mocks__/vscode.js
@@ -52,6 +52,11 @@ const vscode = {
 			this.id = id
 		}
 	},
+	ExtensionMode: {
+		Production: 1,
+		Development: 2,
+		Test: 3,
+	},
 }
 
 module.exports = vscode
diff --git a/src/core/webview/__tests__/ClineProvider.test.ts b/src/core/webview/__tests__/ClineProvider.test.ts
index 0fb7012..2538e7e 100644
--- a/src/core/webview/__tests__/ClineProvider.test.ts
+++ b/src/core/webview/__tests__/ClineProvider.test.ts
@@ -108,6 +108,11 @@ jest.mock("vscode", () => ({
 		uriScheme: "vscode",
 		language: "en",
 	},
+	ExtensionMode: {
+		Production: 1,
+		Development: 2,
+		Test: 3,
+	},
 }))
 
 // Mock sound utility