Update QaSchema IT to use TestKit [ECR-3054] (#899)

Use testkit instead of memoryDb to access the database state.

Author: dmitry-timofeev

exonum-java-binding/qa-service/src/test/java/com/exonum/binding/qaservice/QaSchemaIntegrationTest.java

@@ -19,12 +19,8 @@
 import static org.assertj.core.api.Assertions.assertThat;
 
 import com.exonum.binding.common.hash.HashCode;
-import com.exonum.binding.proxy.Cleaner;
-import com.exonum.binding.proxy.CloseFailuresException;
-import com.exonum.binding.storage.database.Database;
-import com.exonum.binding.storage.database.MemoryDb;
-import com.exonum.binding.storage.database.Snapshot;
 import com.exonum.binding.test.RequiresNativeLibrary;
+import com.exonum.binding.testkit.TestKit;
 import com.exonum.binding.util.LibraryLoader;
 import java.util.List;
 import org.junit.jupiter.api.BeforeAll;
@@ -39,20 +35,19 @@ static void loadLibrary() {
   }
 
   @Test
-  void getStateHashesEmptyDb() throws CloseFailuresException {
-    try (Database db = MemoryDb.newInstance();
-         Cleaner cleaner = new Cleaner()) {
-      Snapshot snapshot = db.createSnapshot(cleaner);
-      QaSchema schema = new QaSchema(snapshot);
+  void getStateHashesEmptyDb() {
+    try (TestKit testKit = TestKit.forService(QaServiceModule.class)) {
+      testKit.withSnapshot((view) -> {
+        QaSchema schema = new QaSchema(view);
 
-      List<HashCode> stateHashes = schema.getStateHashes();
+        List<HashCode> stateHashes = schema.getStateHashes();
 
-      assertThat(stateHashes)
-          .hasSize(1);
+        assertThat(stateHashes).hasSize(1);
 
-      HashCode countersRootHash = schema.counters().getRootHash();
-      assertThat(stateHashes.get(0))
-          .isEqualTo(countersRootHash);
+        HashCode countersRootHash = schema.counters().getRootHash();
+        assertThat(stateHashes.get(0)).isEqualTo(countersRootHash);
+        return null;
+      });
     }
   }
 }