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diff --git a/spec/javascripts/signin_tabs_memoizer_spec.js.es6 b/spec/javascripts/signin_tabs_memoizer_spec.js.es6
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+++ b/spec/javascripts/signin_tabs_memoizer_spec.js.es6
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+/*= require signin_tabs_memoizer */
+
+((global) => {
+  describe('SigninTabsMemoizer', () => {
+    const fixtureTemplate = 'signin_tabs.html';
+    const tabSelector = 'ul.nav-tabs';
+    const currentTabKey = 'current_signin_tab';
+    let memo;
+
+    function createMemoizer() {
+      memo = new global.ActiveTabMemoizer({
+        currentTabKey,
+        tabSelector,
+      });
+      return memo;
+    }
+
+    fixture.preload(fixtureTemplate);
+
+    beforeEach(() => {
+      fixture.load(fixtureTemplate);
+    });
+
+    it('does nothing if no tab was previously selected', () => {
+      createMemoizer();
+
+      expect(document.querySelector('li a.active').getAttribute('id')).toEqual('standard');
+    });
+
+    it('shows last selected tab on boot', () => {
+      createMemoizer().saveData('#ldap');
+      const fakeTab = {
+        click: () => {},
+      };
+      spyOn(document, 'querySelector').and.returnValue(fakeTab);
+      spyOn(fakeTab, 'click');
+
+      memo.bootstrap();
+
+      // verify that triggers click on the last selected tab
+      expect(document.querySelector).toHaveBeenCalledWith(`${tabSelector} a[href="#ldap"]`);
+      expect(fakeTab.click).toHaveBeenCalled();
+    });
+
+    it('saves last selected tab on change', () => {
+      createMemoizer();
+
+      document.getElementById('standard').click();
+
+      expect(memo.readData()).toEqual('#standard');
+    });
+  });
+})(window);