diff --git a/containers/App.js b/containers/App.js
index ce71cd8..f037ab4 100644
--- a/containers/App.js
+++ b/containers/App.js
@@ -85,7 +85,7 @@ const matchingVisibleTodosSelector = createSelector(
   selectMatchingTodos
 );
 
-const select = createStructuredSelector({
+export const select = createStructuredSelector({
   matchingVisibleTodos: matchingVisibleTodosSelector,
   visibilityFilter: visibilityFilterSelector,
   currentTheme: currentThemeSelector,
diff --git a/package.json b/package.json
index 64d9ed9..1713d66 100644
--- a/package.json
+++ b/package.json
@@ -28,10 +28,11 @@
     "babel-core": "^5.6.18",
     "babel-loader": "^5.1.4",
     "babel-plugin-react-transform": "^1.1.0",
+    "chai": "^3.4.0",
     "expect": "^1.8.0",
     "express": "^4.13.3",
     "jsdom": "^5.6.1",
-    "mocha": "^2.2.5",
+    "mocha": "^2.3.3",
     "node-libs-browser": "^0.5.2",
     "raw-loader": "^0.5.1",
     "react-addons-test-utils": "^0.14.0",
diff --git a/test/setup.js b/test/setup.js
new file mode 100644
index 0000000..47d13a3
--- /dev/null
+++ b/test/setup.js
@@ -0,0 +1 @@
+import chai from 'chai';
diff --git a/test/specs.js b/test/specs.js
new file mode 100644
index 0000000..47648e7
--- /dev/null
+++ b/test/specs.js
@@ -0,0 +1,50 @@
+import { expect } from 'chai';
+
+import { select } from '../containers/App';
+
+describe('App', () => {
+  describe('select function', () => {
+
+    describe('matchingVisibleTodos', () => {
+      const allTodos = [
+        { text: 'a', completed: false },
+        { text: 'ab', completed: true },
+        { text: 'b', completed: false },
+        { text: 'bc', completed: true }
+      ];
+
+      it('returns all todos with empty search term and SHOW_ALL filter', () => {
+        const state = {
+          todos: allTodos,
+          searchTerm: '',
+          visibilityFilter: 'SHOW_ALL'
+        };
+        expect(select(state).matchingVisibleTodos).to.eql(allTodos);
+      });
+
+      it('applies visibilty filter', () => {
+        const state = {
+          todos: allTodos,
+          searchTerm: '',
+          visibilityFilter: 'SHOW_COMPLETED'
+        };
+        expect(select(state).matchingVisibleTodos).to.eql([
+          { text: 'ab', completed: true },
+          { text: 'bc', completed: true }
+        ]);
+      });
+
+      it('applies the search term', () => {
+        const state = {
+          todos: allTodos,
+          searchTerm: 'a',
+          visibilityFilter: 'SHOW_ALL'
+        };
+        expect(select(state).matchingVisibleTodos).to.eql([
+          { text: 'a', completed: false },
+          { text: 'ab', completed: true }
+        ]);
+      });
+    });
+  });
+});