test: implement new protocol methods

Update FakeModule in OpenIapStoreTest to implement getAvailableItems and getStorefront to match OpenIapProtocol changes.

Author: hyochan

openiap/src/test/java/dev/hyo/openiap/OpenIapStoreTest.kt

@@ -38,6 +38,8 @@ class OpenIapStoreTest {
 
         override suspend fun getAvailablePurchases(options: PurchaseOptions?): List<OpenIapPurchase> = purchasesToReturn
 
+        override suspend fun getAvailableItems(type: ProductRequest.ProductRequestType): List<OpenIapPurchase> = purchasesToReturn
+
         override suspend fun getActiveSubscriptions(subscriptionIds: List<String>?): List<OpenIapActiveSubscription> = activeSubsToReturn
 
         override suspend fun hasActiveSubscriptions(subscriptionIds: List<String>?): Boolean = activeSubsToReturn.isNotEmpty()
@@ -67,6 +69,8 @@ class OpenIapStoreTest {
             lastDeepLinkOptions = options
         }
 
+        override suspend fun getStorefront(): String = ""
+
         override fun addPurchaseUpdateListener(listener: OpenIapPurchaseUpdateListener) {
             updateListeners.add(listener)
         }
@@ -171,4 +175,3 @@ class OpenIapStoreTest {
         assertEquals("sku.sub", result.first().productId)
     }
 }
-