diff --git a/packages/extension-ui/src/Popup/ImportSeed/ImportSeed.test.tsx b/packages/extension-ui/src/Popup/ImportSeed/ImportSeed.test.tsx
new file mode 100644
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+++ b/packages/extension-ui/src/Popup/ImportSeed/ImportSeed.test.tsx
@@ -0,0 +1,182 @@
+// Copyright 2019-2021 @polkadot/extension-ui authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import '../../../../../__mocks__/chrome';
+
+import Adapter from '@wojtekmaj/enzyme-adapter-react-17';
+import { configure, mount, ReactWrapper } from 'enzyme';
+import React from 'react';
+import { act } from 'react-dom/test-utils';
+import { MemoryRouter } from 'react-router';
+
+import { ActionContext, Button, Warning } from '../../components';
+import * as messaging from '../../messaging';
+import { flushAllPromises } from '../../testHelpers';
+import ImportSeed from './';
+
+const account = {
+  derivation: '/1',
+  expectedAddress: '5GNg7RWeAAJuya4wTxb8aZf19bCWJroKuJNrhk4N3iYHNqTm',
+  expectedAddressWithDerivation: '5DV3x9zgaXREUMTX7GgkP3ETeW4DQAznWTxg4kx2WivGuQLQ',
+  name: 'My Polkadot Account',
+  password: 'somePassword',
+  seed: 'upgrade multiply predict hip multiply march leg devote social outer oppose debris'
+};
+
+// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment,@typescript-eslint/no-unsafe-call
+configure({ adapter: new Adapter() });
+
+const typeSeed = async (wrapper: ReactWrapper, value: string) => {
+  wrapper.find('textarea').first().simulate('change', { target: { value } });
+  await act(flushAllPromises);
+  wrapper.update();
+};
+
+const typeDerivationPath = async (wrapper: ReactWrapper, value: string) => {
+  wrapper.find('input').first().simulate('change', { target: { value } });
+  await act(flushAllPromises);
+  wrapper.update();
+};
+
+describe('ImportSeed', () => {
+  let wrapper: ReactWrapper;
+  const onActionStub = jest.fn();
+
+  const type = async (input: ReactWrapper, value: string): Promise<void> => {
+    input.simulate('change', { target: { value } });
+    await act(flushAllPromises);
+    wrapper.update();
+  };
+
+  const enterName = (name: string): Promise<void> => type(wrapper.find('input').first(), name);
+  const password = (password: string) => (): Promise<void> => type(wrapper.find('input[type="password"]').first(), password);
+  const repeat = (password: string) => (): Promise<void> => type(wrapper.find('input[type="password"]').last(), password);
+
+  beforeEach(async () => {
+    // eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
+    wrapper = mount(
+      <ActionContext.Provider value={onActionStub}>
+        <MemoryRouter>
+          <ImportSeed />
+        </MemoryRouter>
+      </ActionContext.Provider>
+    );
+
+    await act(flushAllPromises);
+    wrapper.update();
+  });
+
+  describe('Step 1', () => {
+    it('first shows no error, no account, and next step button is disabled', () => {
+      expect(wrapper.find('Name span').text()).toEqual('<unknown>');
+      expect(wrapper.find('[data-field="address"]').text()).toEqual('<unknown>');
+      expect(wrapper.find('.derivationPath').exists()).toBe(false);
+      expect(wrapper.find(Warning).exists()).toBe(false);
+      expect(wrapper.find(Button).prop('isDisabled')).toBe(true);
+    });
+
+    it('shows the expected account when correct seed is typed and next step button is enabled', async () => {
+      jest.spyOn(messaging, 'validateSeed').mockResolvedValue({ address: account.expectedAddress, suri: account.seed });
+      await typeSeed(wrapper, account.seed);
+
+      expect(wrapper.find(Warning).exists()).toBe(false);
+      expect(wrapper.find(Button).prop('isDisabled')).toBe(false);
+      expect(wrapper.find('Name span').text()).toEqual('<unknown>');
+      expect(wrapper.find('[data-field="address"]').text()).toEqual(account.expectedAddress);
+    });
+
+    it('shows an error when incorrect seed is typed and next step button is enabled', async () => {
+    // eslint-disable-next-line @typescript-eslint/require-await
+      jest.spyOn(messaging, 'validateSeed').mockImplementation(async () => {
+        throw new Error('Some test error message');
+      });
+      await typeSeed(wrapper, 'this is an invalid mnemonic seed');
+
+      expect(wrapper.find(Warning).find('.warning-message').text()).toEqual('Invalid mnemonic seed');
+      expect(wrapper.find(Button).prop('isDisabled')).toBe(true);
+      expect(wrapper.find('Name span').text()).toEqual('<unknown>');
+      expect(wrapper.find('[data-field="address"]').text()).toEqual('<unknown>');
+    });
+
+    it('shows an error when the seed is removed', async () => {
+      await typeSeed(wrapper, 'asdf');
+      await typeSeed(wrapper, '');
+
+      expect(wrapper.find(Warning).find('.warning-message').text()).toEqual('Mnemonic needs to contain 12, 15, 18, 21, 24 words');
+      expect(wrapper.find(Button).prop('isDisabled')).toBe(true);
+    });
+
+    it('shows the expected account with derivation when correct seed is typed and next step button is enabled', async () => {
+      const suri = `${account.seed}${account.derivation}`;
+      const validateCall = jest.spyOn(messaging, 'validateSeed').mockResolvedValue({ address: account.expectedAddressWithDerivation, suri });
+
+      await typeSeed(wrapper, account.seed);
+      wrapper.find('.advancedToggle').simulate('click');
+      await typeDerivationPath(wrapper, account.derivation);
+
+      expect(validateCall).toHaveBeenLastCalledWith(suri);
+      expect(wrapper.find(Warning).exists()).toBe(false);
+      expect(wrapper.find(Button).prop('isDisabled')).toBe(false);
+      expect(wrapper.find('Name span').text()).toEqual('<unknown>');
+      expect(wrapper.find('[data-field="address"]').text()).toEqual(account.expectedAddressWithDerivation);
+    });
+
+    it('shows an error when derivation path is incorrect and next step button is disabled', async () => {
+      const wrongPath = 'wrong';
+      const suri = `${account.seed}${wrongPath}`;
+      // eslint-disable-next-line @typescript-eslint/require-await
+      const validateCall = jest.spyOn(messaging, 'validateSeed').mockImplementation(async () => {
+        throw new Error('Some test error message');
+      });
+
+      await typeSeed(wrapper, account.seed);
+      wrapper.find('.advancedToggle').simulate('click');
+      await typeDerivationPath(wrapper, wrongPath);
+
+      expect(validateCall).toHaveBeenLastCalledWith(suri);
+      expect(wrapper.find(Warning).find('.warning-message').text()).toEqual('Invalid mnemonic seed or derivation path');
+      expect(wrapper.find(Button).prop('isDisabled')).toBe(true);
+      expect(wrapper.find('Name span').text()).toEqual('<unknown>');
+      expect(wrapper.find('[data-field="address"]').text()).toEqual('<unknown>');
+    });
+
+    it('moves to the second step', async () => {
+      jest.spyOn(messaging, 'validateSeed').mockResolvedValue({ address: account.expectedAddress, suri: account.seed });
+      await typeSeed(wrapper, account.seed);
+      wrapper.find(Button).simulate('click');
+      await act(flushAllPromises);
+      wrapper.update();
+
+      expect(wrapper.find(Button)).toHaveLength(2);
+      expect(wrapper.find('Name span').text()).toEqual('<unknown>');
+      expect(wrapper.find('[data-field="address"]').text()).toEqual(account.expectedAddress);
+    });
+
+    describe('Phase 2', () => {
+      const suri = `${account.seed}${account.derivation}`;
+
+      beforeEach(async () => {
+        jest.spyOn(messaging, 'createAccountSuri').mockResolvedValue(true);
+        jest.spyOn(messaging, 'validateSeed').mockResolvedValue({ address: account.expectedAddressWithDerivation, suri });
+
+        await typeSeed(wrapper, account.seed);
+        wrapper.find('.advancedToggle').simulate('click');
+        await typeDerivationPath(wrapper, account.derivation);
+        wrapper.find(Button).simulate('click');
+
+        await act(flushAllPromises);
+        wrapper.update();
+      });
+
+      it('saves account with provided name and password', async () => {
+        await enterName(account.name).then(password(account.password)).then(repeat(account.password));
+        wrapper.find('[data-button-action="add new root"] button').simulate('click');
+        await act(flushAllPromises);
+        wrapper.update();
+
+        expect(messaging.createAccountSuri).toBeCalledWith(account.name, account.password, suri);
+        expect(onActionStub).toBeCalledWith('/');
+      });
+    });
+  });
+});