diff --git a/packages/core-components/src/layout/Sidebar/MobileSidebar.test.tsx b/packages/core-components/src/layout/Sidebar/MobileSidebar.test.tsx
new file mode 100644
index 0000000000..6f6463a3dc
--- /dev/null
+++ b/packages/core-components/src/layout/Sidebar/MobileSidebar.test.tsx
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2020 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { mockBreakpoint, renderInTestApp } from '@backstage/test-utils';
+import CreateComponentIcon from '@material-ui/icons/AddCircleOutline';
+import HomeIcon from '@material-ui/icons/Home';
+import LayersIcon from '@material-ui/icons/Layers';
+import LibraryBooks from '@material-ui/icons/LibraryBooks';
+import { fireEvent } from '@testing-library/react';
+import React from 'react';
+import { Sidebar } from './Bar';
+import { SidebarItem } from './Items';
+import { MobileSidebar } from './MobileSidebar';
+import { SidebarGroup } from './SidebarGroup';
+
+const MobileSidebarWithGroups = () => (
+  <MobileSidebar>
+    <h1>Header</h1>
+    <SidebarGroup icon={<HomeIcon />} label="Menu">
+      <SidebarItem icon={HomeIcon} to="/" text="Home" />
+      <SidebarItem icon={LayersIcon} to="/" text="Explore" />
+      <SidebarItem icon={LibraryBooks} to="/" text="Docs" />
+    </SidebarGroup>
+    <div>Content</div>
+    <div>More Content</div>
+    <SidebarGroup icon={<CreateComponentIcon />} label="Create" to="#" />
+    <footer>Footer</footer>
+  </MobileSidebar>
+);
+
+const MobileSidebarWithoutGroups = () => (
+  <MobileSidebar>
+    <SidebarItem icon={HomeIcon} to="/one" text="Home" />
+    <SidebarItem icon={LayersIcon} to="/two" text="Explore" />
+    <SidebarItem icon={LibraryBooks} to="/three" text="Docs" />
+  </MobileSidebar>
+);
+
+describe('<MobileSidebar />', () => {
+  beforeEach(() => {
+    mockBreakpoint({ matches: true });
+  });
+
+  it('should render MobileSidebar on smaller screens', async () => {
+    const { getByTestId } = await renderInTestApp(
+      <Sidebar>
+        <SidebarItem icon={HomeIcon} to="/one" text="Home" />
+      </Sidebar>,
+    );
+    expect(getByTestId('mobile-sidebar-root')).toBeVisible();
+  });
+
+  it('should render only SidebarGroups inside MobileSidebar', async () => {
+    const { findAllByRole, getByTestId, findByText } = await renderInTestApp(
+      <MobileSidebarWithGroups />,
+    );
+    expect(getByTestId('mobile-sidebar-root').children.length).toBe(2);
+    expect((await findAllByRole('button')).length).toBe(2);
+    expect(await findByText('Menu')).toBeValid();
+    expect(await findByText('Create')).toBeValid();
+  });
+
+  it('should render default MobileSidebar when there are no SidebarGroups', async () => {
+    const { findAllByRole, getByTestId } = await renderInTestApp(
+      <MobileSidebarWithoutGroups />,
+    );
+    expect(getByTestId('mobile-sidebar-root').children.length).toBe(1);
+    const defaultSidebarGroup = await findAllByRole('button');
+    expect(defaultSidebarGroup.length).toBe(1);
+  });
+
+  it('should render OverlayMenu displaying SidebarItems', async () => {
+    const { findByText, getByRole } = await renderInTestApp(
+      <MobileSidebarWithGroups />,
+    );
+    const menuButton = await findByText('Menu');
+    fireEvent.click(menuButton);
+    expect(getByRole('heading', { name: 'Menu' })).toBeVisible();
+    expect(getByRole('link', { name: 'Home' })).toBeVisible();
+    expect(getByRole('link', { name: 'Explore' })).toBeVisible();
+    expect(getByRole('link', { name: 'Docs' })).toBeVisible();
+  });
+});
diff --git a/packages/core-components/src/layout/Sidebar/MobileSidebar.tsx b/packages/core-components/src/layout/Sidebar/MobileSidebar.tsx
index 93fc4d58c5..881a933efd 100644
--- a/packages/core-components/src/layout/Sidebar/MobileSidebar.tsx
+++ b/packages/core-components/src/layout/Sidebar/MobileSidebar.tsx
@@ -43,6 +43,7 @@ const useStyles = makeStyles<BackstageTheme>(theme => ({
     left: 0,
     right: 0,
     zIndex: 1000,
+    // SidebarDivider color
     borderTop: '1px solid #383838',
   },
 
@@ -165,7 +166,10 @@ export const MobileSidebar = ({ children }: React.PropsWithChildren<{}>) => {
           onClose={() => setSelectedMenuItemIndex(-1)}
         />
       )}
-      <BottomNavigation className={classes.root}>
+      <BottomNavigation
+        className={classes.root}
+        data-testid="mobile-sidebar-root"
+      >
         {sidebarGroups}
       </BottomNavigation>
     </MobileSidebarContext.Provider>
diff --git a/packages/core-components/src/layout/Sidebar/SidebarGroup.test.tsx b/packages/core-components/src/layout/Sidebar/SidebarGroup.test.tsx
new file mode 100644
index 0000000000..664495067c
--- /dev/null
+++ b/packages/core-components/src/layout/Sidebar/SidebarGroup.test.tsx
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2020 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import { mockBreakpoint, renderInTestApp } from '@backstage/test-utils';
+import HomeIcon from '@material-ui/icons/Home';
+import LayersIcon from '@material-ui/icons/Layers';
+import LibraryBooks from '@material-ui/icons/LibraryBooks';
+import { fireEvent } from '@testing-library/react';
+import React from 'react';
+import { SidebarItem } from './Items';
+import { MobileSidebarContext } from './MobileSidebar';
+import { SidebarGroup } from './SidebarGroup';
+
+const SidebarGroupWithItems = () => (
+  <SidebarGroup icon={<HomeIcon />} label="Menu">
+    <SidebarItem icon={HomeIcon} to="/one" text="Home" />
+    <SidebarItem icon={LayersIcon} to="/two" text="Explore" />
+    <SidebarItem icon={LibraryBooks} to="/three" text="Docs" />
+  </SidebarGroup>
+);
+
+describe('<SidebarGroup />', () => {
+  it('should render Items in BottomNavigationAciton on small screens', async () => {
+    mockBreakpoint({ matches: true });
+    const { findByRole, container } = await renderInTestApp(
+      <SidebarGroupWithItems />,
+    );
+    expect(container.childNodes.length).toBe(1);
+    expect(await findByRole('button')).toBeVisible();
+  });
+
+  it('should render Items without wrapper on bigger screens', async () => {
+    mockBreakpoint({ matches: false });
+    const { container } = await renderInTestApp(<SidebarGroupWithItems />);
+    expect(container.childNodes.length).toBe(3);
+  });
+
+  it('should trigger update of MobileSidebarContext', async () => {
+    mockBreakpoint({ matches: true });
+    const value = {
+      selectedMenuItemIndex: -1,
+      setSelectedMenuItemIndex: jest.fn(),
+    };
+    const { findByRole } = await renderInTestApp(
+      <MobileSidebarContext.Provider value={value}>
+        <SidebarGroupWithItems />
+      </MobileSidebarContext.Provider>,
+    );
+    const group = await findByRole('button');
+    fireEvent.click(group);
+    expect(value.setSelectedMenuItemIndex).toHaveBeenCalled();
+  });
+});