src/test/resources/res/layout/fragment_activity.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/fragment_container"
        android:orientation="vertical"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        >

    <fragment
            android:id="@+id/fragment"
            android:tag="fragment_tag"
            android:name="com.xtremelabs.robolectric.shadows.TestFragment"
            />

    <LinearLayout
            android:id="@+id/dynamic_fragment_container"
            />


</LinearLayout>