diff --git a/packages/suite-base/src/panels/UserScriptEditor/Editor.test.tsx b/packages/suite-base/src/panels/UserScriptEditor/Editor.test.tsx
new file mode 100644
index 0000000000..449f6f9ee6
--- /dev/null
+++ b/packages/suite-base/src/panels/UserScriptEditor/Editor.test.tsx
@@ -0,0 +1,305 @@
+/** @jest-environment jsdom */
+
+// SPDX-FileCopyrightText: Copyright (C) 2023-2026 Bayerische Motoren Werke Aktiengesellschaft (BMW AG)<lichtblick@bmwgroup.com>
+// SPDX-License-Identifier: MPL-2.0
+
+import { act, render, waitFor } from "@testing-library/react";
+import * as monacoApi from "monaco-editor/esm/vs/editor/editor.api";
+
+import { BasicBuilder } from "@lichtblick/test-builders";
+
+import "@testing-library/jest-dom";
+
+import Editor from "./Editor";
+import { Script } from "./script";
+
+let mockOpenHandler:
+  | ((
+      input: { resource: { path: string }; options?: { selection?: unknown } },
+      editor: unknown,
+    ) => Promise<unknown>)
+  | undefined = undefined;
+
+jest.mock("monaco-editor", () => ({
+  typescript: {
+    typescriptDefaults: {
+      addExtraLib: jest.fn(() => ({ dispose: jest.fn() })),
+      setEagerModelSync: jest.fn(),
+      setDiagnosticsOptions: jest.fn(),
+      setCompilerOptions: jest.fn(),
+      getCompilerOptions: jest.fn(() => ({})),
+    },
+    javascriptDefaults: {
+      setEagerModelSync: jest.fn(),
+    },
+  },
+  KeyMod: { CtrlCmd: 1 },
+  KeyCode: { KeyS: 55 },
+}));
+
+type MockModel = {
+  uri: { path: string; toString: () => string };
+  value: string;
+  options: Record<string, unknown>;
+  getValue: jest.Mock<string, []>;
+  setValue: jest.Mock<void, [string]>;
+  updateOptions: jest.Mock<void, [Record<string, unknown>]>;
+  getFullModelRange: jest.Mock<Record<string, never>, []>;
+};
+jest.mock("monaco-editor/esm/vs/editor/editor.api", () => {
+  const models = new Map<string, MockModel>();
+
+  const createModel = (
+    value: string,
+    _language: string,
+    uri: { path: string; toString: () => string },
+  ) => {
+    const model: MockModel = {
+      uri,
+      value,
+      options: {},
+      getValue: jest.fn(() => model.value),
+      setValue: jest.fn((next) => {
+        model.value = next;
+      }),
+      updateOptions: jest.fn((opts) => {
+        model.options = { ...model.options, ...opts };
+      }),
+      getFullModelRange: jest.fn(() => ({})),
+    };
+    models.set(uri.path, model);
+    return model;
+  };
+
+  const getModel = (uri: { path: string; toString: () => string }) => models.get(uri.path);
+
+  return {
+    editor: {
+      defineTheme: jest.fn(),
+      createModel: jest.fn(
+        (value: string, language: string, uri: { path: string; toString: () => string }) =>
+          createModel(value, language, uri),
+      ),
+      getModel: jest.fn((uri: { path: string; toString: () => string }) => getModel(uri)),
+    },
+    languages: {
+      registerDocumentFormattingEditProvider: jest.fn(),
+    },
+    Uri: {
+      parse: jest.fn((value: string) => ({
+        path: new URL(value).pathname,
+        toString: () => value,
+      })),
+    },
+    KeyMod: { CtrlCmd: 1 },
+    KeyCode: { KeyS: 55 },
+    clearModels: () => {
+      models.clear();
+    },
+    __getModels: () => models,
+  };
+});
+
+jest.mock("monaco-editor/esm/vs/editor/browser/services/codeEditorService", () => ({
+  ICodeEditorService: Symbol("ICodeEditorService"),
+}));
+
+jest.mock("monaco-editor/esm/vs/editor/standalone/browser/standaloneServices", () => ({
+  StandaloneServices: {
+    get: jest.fn(() => ({
+      registerCodeEditorOpenHandler: jest.fn((handler) => {
+        mockOpenHandler = handler;
+        return { dispose: jest.fn() };
+      }),
+    })),
+  },
+}));
+
+let mockOnChange: ((code: string) => void) | undefined;
+let mockEditor: ReturnType<typeof createMockEditor> | undefined;
+
+const createMockEditor = () => {
+  const actions = new Map<string, { run: jest.Mock }>();
+  const formatAction = { run: jest.fn(async () => {}) };
+  actions.set("editor.action.formatDocument", formatAction);
+  let currentModel: MockModel | undefined;
+
+  return {
+    setModel: jest.fn((model: MockModel) => {
+      currentModel = model;
+    }),
+    getModel: jest.fn(() => currentModel),
+    addAction: jest.fn(({ id, run }: { id: string; run: () => Promise<void> | void }) => {
+      actions.set(id, { run: jest.fn(run) });
+    }),
+    getAction: jest.fn((id: string) => actions.get(id)),
+    setSelection: jest.fn(),
+    revealRangeInCenter: jest.fn(),
+    setPosition: jest.fn(),
+    revealPositionInCenter: jest.fn(),
+    layout: jest.fn(),
+  };
+};
+
+jest.mock("react-monaco-editor", () => {
+  return function MockMonacoEditor(props: {
+    editorWillMount?: (monaco: unknown) => unknown;
+    editorDidMount?: (editor: unknown, monaco: unknown) => void;
+    onChange?: (code: string) => void;
+  }) {
+    const mockMonacoApi = jest.requireMock("monaco-editor/esm/vs/editor/editor.api");
+    mockOnChange = props.onChange;
+    mockEditor = createMockEditor();
+    props.editorWillMount?.(mockMonacoApi);
+    props.editorDidMount?.(mockEditor, mockMonacoApi);
+    return undefined;
+  };
+});
+
+jest.mock("@mui/material", () => ({
+  useTheme: () => ({ palette: { mode: "dark" } }),
+}));
+
+jest.mock("react-resize-detector", () => ({
+  useResizeDetector: jest.fn(() => ({ ref: jest.fn() })),
+}));
+
+jest.mock(
+  "@lichtblick/suite-base/players/UserScriptPlayer/transformerWorker/typescript/projectConfig",
+  () => ({
+    getUserScriptProjectConfig: jest.fn(() => ({
+      rosLib: { fileName: "ros-lib.d.ts" },
+      declarations: [{ fileName: "types.d.ts", sourceCode: "// declarations" }],
+      utilityFiles: [{ filePath: "/utility.ts", sourceCode: "export const util = 1;" }],
+    })),
+  }),
+);
+
+jest.mock("@lichtblick/suite-base/stories/inScreenshotTests", () => jest.fn(() => false));
+
+// Tests
+
+describe("Editor", () => {
+  let baseScript: Script;
+  const buildScript = (overrides: Partial<Script> = {}): Script => ({
+    filePath: `${BasicBuilder.string()}.ts`,
+    code: BasicBuilder.string(),
+    readOnly: false,
+    ...overrides,
+  });
+
+  const renderEditor = (props: Partial<React.ComponentProps<typeof Editor>> = {}) => {
+    const {
+      autoFormatOnSave = false,
+      script = baseScript,
+      setScriptCode = jest.fn(),
+      save = jest.fn(),
+      setScriptOverride = jest.fn(),
+      rosLib = BasicBuilder.string(),
+      typesLib = BasicBuilder.string(),
+    } = props;
+
+    return render(
+      <Editor
+        autoFormatOnSave={autoFormatOnSave}
+        script={script}
+        setScriptCode={setScriptCode}
+        save={save}
+        setScriptOverride={setScriptOverride}
+        rosLib={rosLib}
+        typesLib={typesLib}
+      />,
+    );
+  };
+
+  beforeEach(() => {
+    jest.clearAllMocks();
+    (monacoApi as unknown as { clearModels?: () => void }).clearModels?.();
+    mockOnChange = undefined;
+    mockEditor = undefined;
+    mockOpenHandler = undefined;
+    baseScript = buildScript();
+  });
+
+  it("Given auto-format is enabled When the save shortcut runs Then the editor formats and saves the script", async () => {
+    const save = jest.fn();
+
+    await act(async () => {
+      renderEditor({ autoFormatOnSave: true, save });
+    });
+
+    await waitFor(() => {
+      expect(mockEditor?.setModel).toHaveBeenCalled();
+    });
+
+    const saveAction = mockEditor?.getAction("ctrl-s");
+    expect(saveAction).toBeDefined();
+
+    await act(async () => {
+      await saveAction?.run();
+    });
+
+    const formatAction = mockEditor?.getAction("editor.action.formatDocument");
+    expect(formatAction?.run).toHaveBeenCalled();
+    expect(save).toHaveBeenCalledWith(baseScript.code);
+  });
+
+  it("Given a request to open another model When the open handler runs Then the script override is populated", async () => {
+    const setScriptOverride = jest.fn();
+    const typesLib = BasicBuilder.string();
+
+    await act(async () => {
+      renderEditor({ setScriptOverride, typesLib });
+    });
+
+    expect(mockOpenHandler).toBeTruthy();
+
+    // Create another model the handler should route to the override hook.
+
+    const otherTypeName = BasicBuilder.string();
+    const otherUri = monacoApi.Uri.parse(`file:///node_modules/@types/${otherTypeName}.d.ts`);
+    monacoApi.editor.createModel(`interface ${otherTypeName} {}`, "typescript", otherUri);
+
+    await act(async () => {
+      await mockOpenHandler?.(
+        {
+          resource: otherUri,
+          options: {
+            selection: {
+              startLineNumber: BasicBuilder.number(),
+              startColumn: BasicBuilder.number(),
+            },
+          },
+        },
+        undefined,
+      );
+    });
+
+    expect(setScriptOverride).toHaveBeenCalledWith({
+      filePath: otherUri.path,
+      code: `interface ${otherTypeName} {}`,
+      readOnly: true,
+      selection: expect.objectContaining({
+        startLineNumber: expect.any(Number),
+        startColumn: expect.any(Number),
+      }),
+    });
+  });
+
+  it("Given the editor receives source changes When the onChange handler fires Then the latest setter is called with new code", async () => {
+    const setScriptCode = jest.fn();
+
+    await act(async () => {
+      renderEditor({ setScriptCode });
+    });
+
+    expect(mockOnChange).toBeDefined();
+
+    const updatedCode = BasicBuilder.string();
+    act(() => {
+      mockOnChange?.(updatedCode);
+    });
+
+    expect(setScriptCode).toHaveBeenCalledWith(updatedCode);
+  });
+});