diff --git a/shell/store/__tests__/growl.test.ts b/shell/store/__tests__/growl.test.ts
new file mode 100644
index 00000000000..ae2d6541367
--- /dev/null
+++ b/shell/store/__tests__/growl.test.ts
@@ -0,0 +1,305 @@
+import {
+  state,
+  getters,
+  mutations,
+  actions,
+} from '@shell/store/growl';
+import { NotificationLevel } from '@shell/types/notifications';
+
+describe('store: growl', () => {
+  describe('state', () => {
+    it('returns fresh initial state', () => {
+      expect(state()).toStrictEqual({ nextId: 1, stack: [] });
+    });
+
+    it('returns independent state instances', () => {
+      const s1 = state();
+      const s2 = state();
+
+      s1.stack.push({ id: 99, started: 0 } as any);
+      expect(s2.stack).toStrictEqual([]);
+    });
+  });
+
+  describe('getters', () => {
+    describe('find', () => {
+      it('returns item matching key-val pair', () => {
+        const s = state();
+
+        s.stack = [
+          { id: 1, color: 'success' },
+          { id: 2, color: 'error' },
+        ] as any[];
+        const result = getters.find(s)({ key: 'color', val: 'error' });
+
+        expect(result).toStrictEqual({ id: 2, color: 'error' });
+      });
+
+      it('returns undefined when no item matches', () => {
+        const s = state();
+
+        s.stack = [{ id: 1, color: 'info' }] as any[];
+        const result = getters.find(s)({ key: 'color', val: 'warning' });
+
+        expect(result).toBeUndefined();
+      });
+    });
+
+    describe('byId', () => {
+      it('returns item with matching id', () => {
+        const s = state();
+
+        s.stack = [{ id: 1 }, { id: 2 }] as any[];
+        const result = getters.byId(s)(2);
+
+        expect(result).toStrictEqual({ id: 2 });
+      });
+
+      it('returns undefined for unknown id', () => {
+        const s = state();
+
+        s.stack = [{ id: 1 }] as any[];
+        const result = getters.byId(s)(99);
+
+        expect(result).toBeUndefined();
+      });
+    });
+  });
+
+  describe('mutations', () => {
+    describe('add', () => {
+      it('prepends item to stack with auto-incremented id and started timestamp', () => {
+        const s = state();
+        const before = Date.now();
+
+        mutations.add(s, { color: 'success', title: 'Done' });
+
+        const after = Date.now();
+
+        expect(s.stack).toHaveLength(1);
+        expect(s.stack[0].id).toStrictEqual(1);
+        expect(s.stack[0].color).toStrictEqual('success');
+        expect(s.stack[0].title).toStrictEqual('Done');
+        expect(s.stack[0].started).toBeGreaterThanOrEqual(before);
+        expect(s.stack[0].started).toBeLessThanOrEqual(after);
+        expect(s.nextId).toStrictEqual(2);
+      });
+
+      it('increments id on successive adds', () => {
+        const s = state();
+
+        mutations.add(s, { color: 'info' });
+        mutations.add(s, { color: 'warning' });
+
+        expect(s.stack[0].id).toStrictEqual(2);
+        expect(s.stack[1].id).toStrictEqual(1);
+        expect(s.nextId).toStrictEqual(3);
+      });
+
+      it('newest item is at front of stack', () => {
+        const s = state();
+
+        mutations.add(s, { title: 'first' });
+        mutations.add(s, { title: 'second' });
+
+        expect(s.stack[0].title).toStrictEqual('second');
+        expect(s.stack[1].title).toStrictEqual('first');
+      });
+
+      it('pops the oldest (last) item when stack is at max capacity of 5', () => {
+        const s = state();
+
+        for (let i = 0; i < 5; i++) {
+          mutations.add(s, { title: `growl-${ i + 1 }` });
+        }
+        expect(s.stack).toHaveLength(5);
+        const idOfOldest = s.stack[4].id;
+
+        mutations.add(s, { title: 'newest' });
+
+        expect(s.stack).toHaveLength(5);
+        expect(s.stack[0].title).toStrictEqual('newest');
+        expect(s.stack.find((item) => item.id === idOfOldest)).toBeUndefined();
+      });
+
+      it('does not remove items when stack is below max capacity', () => {
+        const s = state();
+
+        for (let i = 0; i < 4; i++) {
+          mutations.add(s, { title: `growl-${ i + 1 }` });
+        }
+        expect(s.stack).toHaveLength(4);
+
+        mutations.add(s, { title: 'fifth' });
+        expect(s.stack).toHaveLength(5);
+      });
+    });
+
+    describe('remove', () => {
+      it('removes item with the given id from stack', () => {
+        const s = state();
+
+        mutations.add(s, { title: 'first' });
+        mutations.add(s, { title: 'second' });
+        const idToRemove = s.stack[1].id;
+
+        mutations.remove(s, idToRemove);
+
+        expect(s.stack).toHaveLength(1);
+        expect(s.stack[0].title).toStrictEqual('second');
+      });
+
+      it('is a no-op when id is not in stack', () => {
+        const s = state();
+
+        mutations.add(s, { title: 'only' });
+        mutations.remove(s, 999);
+
+        expect(s.stack).toHaveLength(1);
+      });
+    });
+
+    describe('clear', () => {
+      it('empties the stack', () => {
+        const s = state();
+
+        mutations.add(s, { title: 'a' });
+        mutations.add(s, { title: 'b' });
+        mutations.clear(s);
+
+        expect(s.stack).toHaveLength(0);
+      });
+
+      it('is safe on an already-empty stack', () => {
+        const s = state();
+
+        mutations.clear(s);
+        expect(s.stack).toHaveLength(0);
+      });
+    });
+  });
+
+  describe('actions', () => {
+    describe('close', () => {
+      it('removes the growl by id', async() => {
+        const commit = jest.fn();
+        const dispatch = jest.fn();
+        const growl = { id: 5 };
+        const byId = jest.fn(() => growl);
+        const ctx = {
+          commit, dispatch, getters: { byId }
+        };
+
+        await (actions.close as any)(ctx, 5);
+
+        expect(commit).toHaveBeenCalledWith('remove', 5);
+      });
+
+      it('dispatches notifications/markRead when growl has a notification', async() => {
+        const commit = jest.fn();
+        const dispatch = jest.fn();
+        const notificationId = 'notif-42';
+        const growl = { id: 5, notification: notificationId };
+        const byId = jest.fn(() => growl);
+        const ctx = {
+          commit, dispatch, getters: { byId }
+        };
+
+        await (actions.close as any)(ctx, 5);
+
+        expect(dispatch).toHaveBeenCalledWith(
+          'notifications/markRead',
+          notificationId,
+          { root: true }
+        );
+      });
+
+      it('does not dispatch notifications/markRead when growl has no notification', async() => {
+        const commit = jest.fn();
+        const dispatch = jest.fn();
+        const growl = { id: 5 };
+        const byId = jest.fn(() => growl);
+        const ctx = {
+          commit, dispatch, getters: { byId }
+        };
+
+        await (actions.close as any)(ctx, 5);
+
+        expect(dispatch).not.toHaveBeenCalled();
+      });
+    });
+
+    describe('notification', () => {
+      it.each([
+        {
+          desc:          'success level',
+          level:         NotificationLevel.Success,
+          expectedColor: 'success',
+          expectedIcon:  'checkmark',
+        },
+        {
+          desc:          'warning level',
+          level:         NotificationLevel.Warning,
+          expectedColor: 'warning',
+          expectedIcon:  'warning',
+        },
+        {
+          desc:          'error level',
+          level:         NotificationLevel.Error,
+          expectedColor: 'error',
+          expectedIcon:  'error',
+        },
+      ])('commits add for $desc', ({ level, expectedColor, expectedIcon }) => {
+        const commit = jest.fn();
+        const notification = {
+          id:      'n-1',
+          title:   'Test',
+          message: 'msg',
+          level,
+        };
+
+        (actions.notification as any)({ commit }, notification);
+
+        expect(commit).toHaveBeenCalledWith('add', {
+          title:        notification.title,
+          message:      notification.message,
+          notification: notification.id,
+          timeout:      5000,
+          color:        expectedColor,
+          icon:         expectedIcon,
+        });
+      });
+
+      it.each([
+        {
+          desc:  'announcement level',
+          level: NotificationLevel.Announcement,
+        },
+        {
+          desc:  'task level',
+          level: NotificationLevel.Task,
+        },
+        {
+          desc:  'info level',
+          level: NotificationLevel.Info,
+        },
+        {
+          desc:  'hidden level',
+          level: NotificationLevel.Hidden,
+        },
+      ])('does not commit add for $desc', ({ level }) => {
+        const commit = jest.fn();
+        const notification = {
+          id:      'n-2',
+          title:   'Skip me',
+          message: 'msg',
+          level,
+        };
+
+        (actions.notification as any)({ commit }, notification);
+
+        expect(commit).not.toHaveBeenCalled();
+      });
+    });
+  });
+});