diff --git a/Android/app/src/androidTest/AndroidManifest.xml b/Android/app/src/androidTest/AndroidManifest.xml
deleted file mode 100644
index 64331104..00000000
--- a/Android/app/src/androidTest/AndroidManifest.xml
+++ /dev/null
@@ -1,23 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!--
-  Instrumentation-only manifest additions.
-
-  HiltTestActivity is an empty @AndroidEntryPoint host for composable-level
-  tests (see HiltTestActivity.kt). It is not part of the shipped app and never
-  reaches the release manifest — this file is merged into the androidTest APK
-  only.
-
-  The theme is a framework one, not @style/Theme.Inkwell: the test APK links
-  against its own resource namespace and cannot see the app's styles. It only
-  has to be a valid no-action-bar host — every screen under test supplies its
-  own colours through InkwellTheme in Compose.
--->
-<manifest xmlns:android="http://schemas.android.com/apk/res/android">
-
-    <application>
-        <activity
-            android:name="uk.ewancroft.inkwell.HiltTestActivity"
-            android:exported="false"
-            android:theme="@android:style/Theme.Material.Light.NoActionBar" />
-    </application>
-</manifest>
diff --git a/Android/app/src/debug/AndroidManifest.xml b/Android/app/src/debug/AndroidManifest.xml
new file mode 100644
index 00000000..c3d74e27
--- /dev/null
+++ b/Android/app/src/debug/AndroidManifest.xml
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Debug-only manifest additions.
+
+  HiltTestActivity is an empty @AndroidEntryPoint host for composable-level
+  tests (see HiltTestActivity.kt). It must live in the app APK, not the
+  androidTest APK: the test rule launches it into the app's process, so
+  declaring it only in the test APK makes the launch resolve to a different
+  process ("resolved to different process ...debug.test").
+
+  It is part of the debug variant only and never reaches the release manifest.
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application>
+        <activity
+            android:name="uk.ewancroft.inkwell.HiltTestActivity"
+            android:exported="false"
+            android:theme="@android:style/Theme.Material.Light.NoActionBar" />
+    </application>
+</manifest>
diff --git a/Android/app/src/androidTest/java/uk/ewancroft/inkwell/HiltTestActivity.kt b/Android/app/src/debug/java/uk/ewancroft/inkwell/HiltTestActivity.kt
similarity index 83%
rename from Android/app/src/androidTest/java/uk/ewancroft/inkwell/HiltTestActivity.kt
rename to Android/app/src/debug/java/uk/ewancroft/inkwell/HiltTestActivity.kt
index f44e62e5..da85ab3e 100644
--- a/Android/app/src/androidTest/java/uk/ewancroft/inkwell/HiltTestActivity.kt
+++ b/Android/app/src/debug/java/uk/ewancroft/inkwell/HiltTestActivity.kt
@@ -12,7 +12,8 @@ import dagger.hilt.android.AndroidEntryPoint
  * ViewModel factory and nothing else, so a test can mount exactly the
  * composable it means to exercise.
  *
- * Declared in `app/src/androidTest/AndroidManifest.xml`.
+ * Declared in `app/src/debug/AndroidManifest.xml`, so it runs in the app process
+ * that the test rule launches it into.
  */
 @AndroidEntryPoint
 class HiltTestActivity : ComponentActivity()