Looks like you have specified incorrect package in manifest file for the test project.
<!--
The instrumentation element tells Android to use instrumentation to run this package.
The target Android package 'com.example.android.notepad' is loaded along with the
test package 'com.example.android.notepad.tests'. Android then starts the class
'android.test.InstrumentationTestRunner', which loads the test case classes in the package.
-->
<instrumentation android:name="android.test.InstrumentationTestRunner"
android:targetPackage="com.example.android.notepad"
android:label="Tests for com.example.android.notepad"/>