Adds a Hilt module for test dependencies

See go/picker-test-injection

Bug: b/297021618
Test: verified that tests use deps from test module
Change-Id: Iada1f20cd69d3e7ce3d80eae3bfdfa5edc57e821
diff --git a/tests/AndroidManifest.xml b/tests/AndroidManifest.xml
index 2fd6b3f..f1c0cf2 100644
--- a/tests/AndroidManifest.xml
+++ b/tests/AndroidManifest.xml
@@ -18,9 +18,17 @@
 
     <application>
         <uses-library android:name="android.test.runner" />
+
+        <activity android:name="com.android.wallpaper.picker.PreviewActivity"
+            android:resizeableActivity="false">
+        </activity>
+
+        <activity android:name="com.android.wallpaper.picker.preview.ui.WallpaperPreviewActivity"
+            android:resizeableActivity="false">
+        </activity>
     </application>
 
-    <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
+    <instrumentation android:name="com.android.wallpaper.CustomTestRunner"
         android:targetPackage="com.android.wallpaper"
         android:label="Tests for ThemePicker" />