Activity in androidTest not getting launched by ActivityTestRule
<p>I want to test a fragment in test activity. I added <code>TestTragmentActivity</code> to <code>androidTest</code> along with <code>AndroidManifest.xml</code> file. But when I try to use this activity via an <code>ActivityTestRule</code> it gives following error:</p>

<pre><code>java.lang.RuntimeException: Could not launch activity
at android.support.test.runner.MonitoringInstrumentation.startActivitySync(MonitoringInstrumentation.java:371)
at android.support.test.rule.ActivityTestRule.launchActivity(ActivityTestRule.java:219)
at com.bbm.ui.fragments.StickerPackListFragmentTest.testEmpty(StickerPackListFragmentTest.java:29)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at android.support.test.internal.statement.UiThreadStatement.evaluate(UiThreadStatement.java:55)
at android.support.test.rule.ActivityTestRule$ActivityStatement.evaluate(ActivityTestRule.java:270)
at org.junit.rules.RunRules.evaluate(RunRules.java:20)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at android.support.test.internal.runner.TestExecutor.execute(TestExecutor.java:59)
at android.support.test.runner.AndroidJUnitRunner.onStart(AndroidJUnitRunner.java:262)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1887)
Caused by: java.lang.RuntimeException: Unable to resolve activity for: Intent { act=android.intent.action.MAIN flg=0x14000000 cmp=com.bbm.debug/com.bbm.TestFragmentActivity }
at android.app.Instrumentation.startActivitySync(Instrumentation.java:391)
at android.support.test.runner.MonitoringInstrumentation.access$201(MonitoringInstrumentation.java:90)
at android.support.test.runner.MonitoringInstrumentation$5.call(MonitoringInstrumentation.java:351)
at android.support.test.runner.MonitoringInstrumentation$5.call(MonitoringInstrumentation.java:348)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:818)
</code></pre>

<p>The <code>TestFragmentActivity</code> is just an empty activity. Below is the <code>AndroidManifest.xml</code> in the <code>androidTest</code> folder.</p>

<pre><code>&lt;manifest 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    package="com.bbm"&gt;

    &lt;application
        android:label="@string/app_name"
        tools:replace="android:label"&gt;

        &lt;activity android:name=".TestFragmentActivity"&gt;&lt;/activity&gt;

    &lt;/application&gt;
&lt;/manifest&gt;
</code></pre>

<p>I tried to get some data about why this is happening. Below is my test:</p>

<pre><code>@RunWith(AndroidJUnit4.class)
public class TestFragment {

    @Rule
    public ActivityTestRule&lt;TestFragmentActivity&gt; rule =
            new ActivityTestRule&lt;&gt;(TestFragmentActivity.class, false, false);


    @Test
    public void testEmpty() {
        // Just for logging purpose
        printActivities(InstrumentationRegistry.getTargetContext(), "APP_TARGET_CONTEXT");
        printActivities(InstrumentationRegistry.getContext(), "APP_CONTEXT");

        // The launch fails....
        rule.launchActivity(null);
    }

    private void printActivities(Context context, String tag) {
        try {
            ActivityInfo[] infos = context.getPackageManager().getPackageInfo(context.getPackageName(), PackageManager.GET_ACTIVITIES).activities;
            for(ActivityInfo info : infos) {
                Log.d(tag, info.name);
            }
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }
        Log.d(tag + "_PACKAGE_NAME", context.getPackageName());
    }

}
</code></pre>

<p>The output of above is:</p>

<pre><code>10-06 18:46:45.419 13030-13052/com.example.achhatra.myapplication D/APP_TARGET_CONTEXT: com.example.achhatra.myapplication.MainActivity
10-06 18:46:45.419 13030-13052/com.example.achhatra.myapplication D/APP_TARGET_CONTEXT_PACKAGE_NAME: com.example.achhatra.myapplication
10-06 18:46:45.419 13030-13052/com.example.achhatra.myapplication D/APP_CONTEXT: com.example.achhatra.myapplication.TestFragmentActivity
10-06 18:46:45.419 13030-13052/com.example.achhatra.myapplication D/APP_CONTEXT_PACKAGE_NAME: com.example.achhatra.myapplication.test
</code></pre>

<p>As you can see the <code>TestFragmentActivity</code> is in the <code>androidTest</code> context and not in the target context. That is the reason <code>ActivityTestRule</code> is not able to launch it. </p>

<p>I would like to know how can I launch this <code>TestFragmentActivity</code> in this test.</p>