CODEWITHSUNDEEP
androidtestingjunitautomated-tests
Code-Apprentice
Code-Apprentice

Reputation: 83527

Adding Android JUnit tests with a custom InstrumentationTestRunner

I want to add parameterized tests to my Android app test suite. In an answer to my previous question, @dtmilano suggested that I implement a test runner which can pass the arguments to my parameterized tests. I would like to pass these to the test's constructor rather directly rather than retrieving them via getter methods. As a simple example, I extended InstrumentationTestRunner:

public class ExampleTestRunner extends InstrumentationTestRunner {

    @Override
    public TestSuite getAllTests() {
        TestSuite suite = super.getAllTests();
        suite.addTest(new TestRunnerActivityTest()); // line 22
        return suite;
    }
}

I also update the test project's manifest:

<instrumentation android:name="codeguru.example.testrunner.ExampleTestRunner"
                 android:targetPackage="codeguru.example.testrunner"
                 android:label="Tests for codeguru.example.testrunner"/>

When I run this test with

$ adb shell am instrument -w codeguru.example.testrunner.tests/codeguru.example.testrunner.ExampleTestRunner

I get

E/AndroidRuntime(  880): java.lang.RuntimeException: Exception thrown in onCreate() of ComponentInfo{codeguru.example.testrunner.tests/codeguru.example.testrunner.ExampleTestRunner}: java.lang.NullPointerException
E/AndroidRuntime(  880):        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4145)
E/AndroidRuntime(  880):        at android.app.ActivityThread.access$1300(ActivityThread.java:130)
E/AndroidRuntime(  880):        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1255)
E/AndroidRuntime(  880):        at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(  880):        at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime(  880):        at android.app.ActivityThread.main(ActivityThread.java:4745)
E/AndroidRuntime(  880):        at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(  880):        at java.lang.reflect.Method.invoke(Method.java:511)
E/AndroidRuntime(  880):        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
E/AndroidRuntime(  880):        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime(  880):        at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(  880): Caused by: java.lang.NullPointerException
E/AndroidRuntime(  880):        at codeguru.example.testrunner.ExampleTestRunner.getAllTests(ExampleTestRunner.java:22)
E/AndroidRuntime(  880):        at android.test.InstrumentationTestRunner.getTestSuite(InstrumentationTestRunner.java:581)
E/AndroidRuntime(  880):        at android.test.InstrumentationTestRunner.onCreate(InstrumentationTestRunner.java:360)
E/AndroidRuntime(  880):        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4142)
E/AndroidRuntime(  880):        ... 10 more

Clearly, I get an NPE because super.getAllTests() returns null. I can of course just create a new TestSuite() and add my tests to this. Ideally, I want to add my parameterized tests to the rest of the "normal" tests which I already have. Does anyone know of a way I can do this?

Upvotes: 2

Views: 3039

Answers (1)

Code-Apprentice
Code-Apprentice

Reputation: 83527

The solution which works for me, although not entirely satisfactory, is to replace the call to super.getAllTests() with new TestSuite().

Upvotes: 1

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