diff --git a/static_src/reducers/redux-helpers.test.js b/static_src/reducers/redux-helpers.test.js
new file mode 100644
index 0000000..93f0e0a
--- /dev/null
+++ b/static_src/reducers/redux-helpers.test.js
@@ -0,0 +1,102 @@
+// Copyright 2019 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import {assert} from 'chai';
+import {createRequestReducer,
+  createKeyedRequestReducer} from './redux-helpers.js';
+
+let keyedRequestReducer;
+let requestReducer;
+
+describe('redux-helpers', () => {
+  describe('createKeyedRequestReducer', () => {
+    beforeEach(() => {
+      keyedRequestReducer = createKeyedRequestReducer(
+          'REQUEST_START', 'REQUEST_SUCCESS', 'REQUEST_FAILURE');
+    });
+
+    it('sets requesting to true on start', () => {
+      assert.deepEqual(keyedRequestReducer({}, {type: 'REQUEST_START'}),
+          {['*']: {requesting: true, error: null}});
+    });
+
+    it('sets requesting to false on success', () => {
+      assert.deepEqual(keyedRequestReducer({}, {type: 'REQUEST_SUCCESS'}),
+          {['*']: {requesting: false, error: null}});
+    });
+
+    it('sets error message on failure', () => {
+      assert.deepEqual(keyedRequestReducer({}, {
+        type: 'REQUEST_FAILURE',
+        error: 'hello',
+      }), {['*']: {requesting: false, error: 'hello'}});
+    });
+
+    it('preserves previous request state on start', () => {
+      const initialState = {
+        ['*']: {requesting: false, error: 'hello'},
+      };
+      assert.deepEqual(keyedRequestReducer(initialState, {
+        type: 'REQUEST_START',
+        requestKey: 'chromium:11',
+      }), {
+        ['*']: {requesting: false, error: 'hello'},
+        ['chromium:11']: {requesting: true, error: null},
+      });
+    });
+
+    it('preserves previous request state on success', () => {
+      const initialState = {
+        ['*']: {requesting: false, error: 'hello'},
+        ['chromium:11']: {requesting: true, error: null},
+      };
+      assert.deepEqual(keyedRequestReducer(initialState, {
+        type: 'REQUEST_SUCCESS',
+        requestKey: 'chromium:11',
+      }), {
+        ['*']: {requesting: false, error: 'hello'},
+        ['chromium:11']: {requesting: false, error: null},
+      });
+    });
+
+    it('preserves previous request state on failure', () => {
+      const initialState = {
+        ['*']: {requesting: false, error: 'hello'},
+        ['chromium:11']: {requesting: false, error: null},
+      };
+      assert.deepEqual(keyedRequestReducer(initialState, {
+        type: 'REQUEST_FAILURE',
+        requestKey: 'chromium:11',
+        error: 'something went wrong',
+      }), {
+        ['*']: {requesting: false, error: 'hello'},
+        ['chromium:11']: {requesting: false, error: 'something went wrong'},
+      });
+    });
+  });
+
+  describe('createRequestReducer', () => {
+    beforeEach(() => {
+      requestReducer = createRequestReducer(
+          'REQUEST_START', 'REQUEST_SUCCESS', 'REQUEST_FAILURE');
+    });
+
+    it('sets requesting to true on start', () => {
+      assert.deepEqual(requestReducer({}, {type: 'REQUEST_START'}),
+          {requesting: true, error: null});
+    });
+
+    it('sets requesting to false on success', () => {
+      assert.deepEqual(requestReducer({}, {type: 'REQUEST_SUCCESS'}),
+          {requesting: false, error: null});
+    });
+
+    it('sets error message on failure', () => {
+      assert.deepEqual(requestReducer({}, {
+        type: 'REQUEST_FAILURE',
+        error: 'hello',
+      }), {requesting: false, error: 'hello'});
+    });
+  });
+});