diff --git a/extensions/ql-vscode/__mocks__/react-dom/test-utils.js b/extensions/ql-vscode/__mocks__/react-dom/test-utils.js
new file mode 100644
index 00000000000..375108585b6
--- /dev/null
+++ b/extensions/ql-vscode/__mocks__/react-dom/test-utils.js
@@ -0,0 +1,7 @@
+// Mock for react-dom/test-utils for React 19 compatibility
+// In React 19, react-dom/test-utils is deprecated and act was moved to the react package.
+const { act } = require("react");
+
+module.exports = {
+  act,
+};
diff --git a/extensions/ql-vscode/eslint.config.mjs b/extensions/ql-vscode/eslint.config.mjs
index da96a4d7e9e..abd912ee481 100644
--- a/extensions/ql-vscode/eslint.config.mjs
+++ b/extensions/ql-vscode/eslint.config.mjs
@@ -27,6 +27,7 @@ export default tseslint.config(
     ".markdownlint-cli2.cjs",
     "eslint.config.mjs",
     "!.storybook",
+    "__mocks__/",
   ]),
   github.getFlatConfigs().recommended,
   ...github.getFlatConfigs().typescript,
diff --git a/extensions/ql-vscode/package.json b/extensions/ql-vscode/package.json
index 457517a66e2..747db220b9b 100644
--- a/extensions/ql-vscode/package.json
+++ b/extensions/ql-vscode/package.json
@@ -2036,7 +2036,7 @@
     "watch": "gulp watch",
     "test": "npm-run-all test:*",
     "test:unit": "cross-env TZ=UTC LANG=en-US NODE_OPTIONS=--no-experimental-strip-types jest --projects test/unit-tests",
-    "test:view": "cross-env NODE_OPTIONS=--no-experimental-strip-types jest --projects src/view",
+    "test:view": "cross-env NODE_ENV=test NODE_OPTIONS=--no-experimental-strip-types jest --projects src/view",
     "test:vscode-integration": "npm-run-all test:vscode-integration:*",
     "test:vscode-integration:activated-extension": "cross-env NODE_OPTIONS=--no-experimental-strip-types jest --projects test/vscode-tests/activated-extension",
     "test:vscode-integration:no-workspace": "cross-env NODE_OPTIONS=--no-experimental-strip-types jest --projects test/vscode-tests/no-workspace",
diff --git a/extensions/ql-vscode/src/view/jest.config.ts b/extensions/ql-vscode/src/view/jest.config.ts
index c197b277e62..560aa0d4d35 100644
--- a/extensions/ql-vscode/src/view/jest.config.ts
+++ b/extensions/ql-vscode/src/view/jest.config.ts
@@ -86,6 +86,8 @@ const config: Config = {
     "\\.(jpg|jpeg|png|gif|eot|otf|webp|svg|ttf|woff|woff2|mp4|webm|wav|mp3|m4a|aac|oga)$":
       "<rootDir>/../../test/__mocks__/fileMock.ts",
     "\\.(css|less)$": "<rootDir>/../../test/__mocks__/styleMock.ts",
+    "^react-dom/test-utils$":
+      "<rootDir>/../../__mocks__/react-dom/test-utils.js",
   },
 
   // An array of regexp pattern strings, matched against all module paths before considered 'visible' to the module loader