diff --git a/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardAlternateCharacterMap.java b/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardAlternateCharacterMap.java
new file mode 100644
index 00000000000..5fe5c708aaf
--- /dev/null
+++ b/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardAlternateCharacterMap.java
@@ -0,0 +1,23 @@
+package expo.modules.hardwarekeyboard;
+
+import android.view.KeyCharacterMap;
+import android.view.KeyEvent;
+import org.robolectric.annotation.Implementation;
+import org.robolectric.annotation.Implements;
+import org.robolectric.shadows.ShadowKeyCharacterMap;
+
+@Implements(KeyCharacterMap.class)
+public class HardwareKeyboardAlternateCharacterMap extends ShadowKeyCharacterMap {
+  @Implementation
+  protected static char nativeGetCharacter(long pointer, int keyCode, int metaState) {
+    if (keyCode != KeyEvent.KEYCODE_Q) return '\u0000';
+    boolean shifted = (metaState & KeyEvent.META_SHIFT_ON) != 0;
+    if ((metaState & KeyEvent.META_ALT_ON) != 0) return shifted ? '#' : '@';
+    return shifted ? 'Q' : 'q';
+  }
+
+  @Implementation
+  protected static char nativeGetDisplayLabel(long pointer, int keyCode) {
+    return keyCode == KeyEvent.KEYCODE_Q ? 'Q' : '\u0000';
+  }
+}
diff --git a/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardAlternateLayoutTest.kt b/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardAlternateLayoutTest.kt
new file mode 100644
index 00000000000..e109b1346ed
--- /dev/null
+++ b/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardAlternateLayoutTest.kt
@@ -0,0 +1,32 @@
+package expo.modules.hardwarekeyboard
+
+import android.view.KeyEvent
+import org.junit.Assert.*
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.annotation.Config
+
+@RunWith(RobolectricTestRunner::class)
+@Config(sdk = [28], manifest = Config.NONE, shadows = [HardwareKeyboardAlternateCharacterMap::class])
+class HardwareKeyboardAlternateLayoutTest {
+  @Test fun synthesizedAltGrKeepsNativeTextAndNeverClaimsARelease() {
+    for (shift in listOf(0, KeyEvent.META_SHIFT_ON)) {
+      val fixture = HardwareKeyboardNativeBoundaryTest.Fixture()
+      val meta = KeyEvent.META_CTRL_ON or KeyEvent.META_ALT_ON or shift
+      assertFalse(fixture.key(KeyEvent.KEYCODE_Q, meta = meta))
+      assertEquals("first", fixture.input.text.toString())
+      assertTrue(fixture.context.events.isEmpty())
+      assertFalse(fixture.key(KeyEvent.KEYCODE_Q, KeyEvent.ACTION_UP, meta = meta))
+    }
+  }
+
+  @Test fun ordinaryCtrlStillCapturesTheLogicalKeyAndFieldBoundary() {
+    val fixture = HardwareKeyboardNativeBoundaryTest.Fixture()
+    assertTrue(fixture.key(KeyEvent.KEYCODE_Q, meta = KeyEvent.META_CTRL_ON))
+    assertEquals("q", fixture.lastKey()["key"])
+    assertEquals("first", (fixture.lastKey()["fieldBoundary"] as Map<*, *>)["text"])
+    assertEquals("", fixture.input.text.toString())
+    assertTrue(fixture.key(KeyEvent.KEYCODE_Q, KeyEvent.ACTION_UP))
+  }
+}
diff --git a/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardNativeBoundaryTest.kt b/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardNativeBoundaryTest.kt
index 10e3f85261c..4231e094779 100644
--- a/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardNativeBoundaryTest.kt
+++ b/mobile/packages/expo-hardware-keyboard/android/src/test/java/expo/modules/hardwarekeyboard/HardwareKeyboardNativeBoundaryTest.kt
@@ -19,7 +19,7 @@ import org.robolectric.annotation.Config
 @RunWith(RobolectricTestRunner::class)
 @Config(sdk = [28], manifest = Config.NONE)
 class HardwareKeyboardNativeBoundaryTest {
-  private class Fixture {
+  internal class Fixture {
     val context = HardwareKeyboardRecordingContext(RuntimeEnvironment.getApplication()).also {
       DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(it)
     }