Add public device keys to rageshakes

libraries/matrix/test/src/main/kotlin/io/element/android/libraries/matrix/test/encryption/FakeEncryptionService.kt

@@ -39,6 +39,9 @@ class FakeEncryptionService : EncryptionService {
 
     private var enableBackupsFailure: Exception? = null
 
+    private var curve25519: String? = null
+    private var ed25519: String? = null
+
     fun givenEnableBackupsFailure(exception: Exception?) {
         enableBackupsFailure = exception
     }
@@ -94,6 +97,15 @@ class FakeEncryptionService : EncryptionService {
         return waitForBackupUploadSteadyStateFlow
     }
 
+    fun givenDeviceKeys(curve25519: String?, ed25519: String?) {
+        this.curve25519 = curve25519
+        this.ed25519 = ed25519
+    }
+
+    override suspend fun deviceCurve25519(): String? = curve25519
+
+    override suspend fun deviceEd25519(): String? = ed25519
+
     suspend fun emitBackupState(state: BackupState) {
         backupStateStateFlow.emit(state)
     }