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diff --git a/devtools/client/debugger/src/actions/tests/ui.spec.js b/devtools/client/debugger/src/actions/tests/ui.spec.js
new file mode 100644
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+++ b/devtools/client/debugger/src/actions/tests/ui.spec.js
@@ -0,0 +1,90 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import {
+  createStore,
+  selectors,
+  actions,
+  makeSource,
+} from "../../utils/test-head";
+import { createLocation } from "../../utils/location";
+import { mockCommandClient } from "./helpers/mockCommandClient";
+
+const {
+  getActiveSearch,
+  getFrameworkGroupingState,
+  getPaneCollapse,
+  getHighlightedLineRangeForSelectedSource,
+} = selectors;
+
+describe("ui", () => {
+  it("should toggle the visible state of file search", () => {
+    const { dispatch, getState } = createStore();
+    expect(getActiveSearch(getState())).toBe(null);
+    dispatch(actions.setActiveSearch("file"));
+    expect(getActiveSearch(getState())).toBe("file");
+  });
+
+  it("should close file search", () => {
+    const { dispatch, getState } = createStore();
+    expect(getActiveSearch(getState())).toBe(null);
+    dispatch(actions.setActiveSearch("file"));
+    dispatch(actions.closeActiveSearch());
+    expect(getActiveSearch(getState())).toBe(null);
+  });
+
+  it("should toggle the collapse state of a pane", () => {
+    const { dispatch, getState } = createStore();
+    expect(getPaneCollapse(getState(), "start")).toBe(false);
+    dispatch(actions.togglePaneCollapse("start", true));
+    expect(getPaneCollapse(getState(), "start")).toBe(true);
+  });
+
+  it("should toggle the collapsed state of frameworks in the callstack", () => {
+    const { dispatch, getState } = createStore();
+    const currentState = getFrameworkGroupingState(getState());
+    dispatch(actions.toggleFrameworkGrouping(!currentState));
+    expect(getFrameworkGroupingState(getState())).toBe(!currentState);
+  });
+
+  it("should highlight lines", async () => {
+    const { dispatch, getState } = createStore(mockCommandClient);
+    const base = await dispatch(
+      actions.newGeneratedSource(makeSource("base.js"))
+    );
+    const sourceActor = selectors.getFirstSourceActorForGeneratedSource(
+      getState(),
+      base.id
+    );
+    const cx = selectors.getThreadContext(getState());
+    //await dispatch(actions.selectSource(cx, base, sourceActor));
+    const location = createLocation({
+      source: base,
+      line: 1,
+      sourceActor,
+    });
+    await dispatch(actions.selectLocation(cx, location));
+
+    const range = { start: 3, end: 5, sourceId: base.id };
+    dispatch(actions.highlightLineRange(range));
+    expect(getHighlightedLineRangeForSelectedSource(getState())).toEqual(range);
+  });
+
+  it("should clear highlight lines", async () => {
+    const { dispatch, getState } = createStore(mockCommandClient);
+    const base = await dispatch(
+      actions.newGeneratedSource(makeSource("base.js"))
+    );
+    const sourceActor = selectors.getFirstSourceActorForGeneratedSource(
+      getState(),
+      base.id
+    );
+    const cx = selectors.getThreadContext(getState());
+    await dispatch(actions.selectSource(cx, base, sourceActor));
+    const range = { start: 3, end: 5, sourceId: "2" };
+    dispatch(actions.highlightLineRange(range));
+    dispatch(actions.clearHighlightLineRange());
+    expect(getHighlightedLineRangeForSelectedSource(getState())).toEqual(null);
+  });
+});