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diff --git a/history/modules/__tests__/HashHistory-basename-test.js b/history/modules/__tests__/HashHistory-basename-test.js
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+++ b/history/modules/__tests__/HashHistory-basename-test.js
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+import expect from 'expect';
+import mock from 'jest-mock';
+import { createHashHistory } from 'history';
+
+describe('a hash history with a basename', () => {
+  it('knows how to create hrefs', () => {
+    window.location.hash = '#/the/base';
+    const history = createHashHistory({ basename: '/the/base' });
+    const href = history.createHref({
+      pathname: '/the/path',
+      search: '?the=query'
+    });
+
+    expect(href).toEqual('#/the/base/the/path?the=query');
+  });
+
+  describe('with a bad basename', () => {
+    it('knows how to create hrefs', () => {
+      window.location.hash = '#/the/bad/base/';
+      const history = createHashHistory({ basename: '/the/bad/base/' });
+      const href = history.createHref({
+        pathname: '/the/path',
+        search: '?the=query'
+      });
+
+      expect(href).toEqual('#/the/bad/base/the/path?the=query');
+    });
+  });
+
+  describe('with a slash basename', () => {
+    it('knows how to create hrefs', () => {
+      const history = createHashHistory({ basename: '/' });
+      const href = history.createHref({
+        pathname: '/the/path',
+        search: '?the=query'
+      });
+
+      expect(href).toEqual('#/the/path?the=query');
+    });
+  });
+
+  it('strips the basename from the pathname', () => {
+    window.location.hash = '/prefix/hello';
+    const history = createHashHistory({ basename: '/prefix' });
+    expect(history.location.pathname).toEqual('/hello');
+  });
+
+  it('is not case-sensitive', () => {
+    window.location.hash = '/PREFIX/hello';
+    const history = createHashHistory({ basename: '/prefix' });
+    expect(history.location.pathname).toEqual('/hello');
+  });
+
+  it('allows special regex characters', () => {
+    window.location.hash = '/prefix$special/hello';
+    const history = createHashHistory({ basename: '/prefix$special' });
+    expect(history.location.pathname).toEqual('/hello');
+  });
+
+  it('does not strip partial prefix matches', () => {
+    window.location.hash = '/no-match/hello';
+
+    // A warning is issued when the prefix is not present.
+    const spy = mock.spyOn(console, 'warn').mockImplementation(() => {});
+
+    const history = createHashHistory({ basename: '/prefix' });
+    expect(history.location.pathname).toEqual('/no-match/hello');
+
+    expect(spy).toHaveBeenCalledTimes(1);
+    spy.mockRestore();
+  });
+
+  describe('when the pathname is only the prefix', () => {
+    it('strips the prefix', () => {
+      window.location.hash = '/prefix';
+      const history = createHashHistory({ basename: '/prefix' });
+      expect(history.location.pathname).toEqual('/');
+    });
+
+    it('strips the prefix when there is a search string', () => {
+      window.location.hash = '/prefix?a=b';
+      const history = createHashHistory({ basename: '/prefix' });
+      expect(history.location.pathname).toEqual('/');
+    });
+
+    it('strips the prefix when there is a hash', () => {
+      window.location.hash = '/prefix#hash';
+      const history = createHashHistory({ basename: '/prefix' });
+      expect(history.location.pathname).toEqual('/');
+    });
+  });
+});