Add test to reproduce / cover concurrency issue described by #10

Signed-off-by: Sebastian Becker <sebastian.becker@de.bosch.com>

castor-service/src/test/java/io/carbynestack/castor/service/persistence/ConcurrencyIT.java

@@ -0,0 +1,81 @@
+package io.carbynestack.castor.service.persistence;
+
+import static org.junit.Assert.assertEquals;
+import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
+
+import io.carbynestack.castor.common.entities.Reservation;
+import io.carbynestack.castor.common.entities.ReservationElement;
+import io.carbynestack.castor.common.entities.TupleType;
+import io.carbynestack.castor.service.CastorServiceApplication;
+import io.carbynestack.castor.service.persistence.cache.ReservationCachingService;
+import io.carbynestack.castor.service.persistence.markerstore.TupleChunkMetaDataStorageService;
+import io.carbynestack.castor.service.testconfig.PersistenceTestEnvironment;
+import io.carbynestack.castor.service.testconfig.ReusableMinioContainer;
+import io.carbynestack.castor.service.testconfig.ReusablePostgreSQLContainer;
+import io.carbynestack.castor.service.testconfig.ReusableRedisContainer;
+import io.vavr.control.Try;
+import java.util.Collections;
+import java.util.UUID;
+import org.junit.Before;
+import org.junit.ClassRule;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.test.context.ActiveProfiles;
+import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
+
+@RunWith(SpringJUnit4ClassRunner.class)
+@SpringBootTest(
+    webEnvironment = RANDOM_PORT,
+    classes = {CastorServiceApplication.class})
+@ActiveProfiles("test")
+public class ConcurrencyIT {
+  @ClassRule
+  public static ReusableRedisContainer reusableRedisContainer =
+      ReusableRedisContainer.getInstance();
+
+  @ClassRule
+  public static ReusableMinioContainer reusableMinioContainer =
+      ReusableMinioContainer.getInstance();
+
+  @ClassRule
+  public static ReusablePostgreSQLContainer reusablePostgreSQLContainer =
+      ReusablePostgreSQLContainer.getInstance();
+
+  @Autowired private PersistenceTestEnvironment testEnvironment;
+  @Autowired private ReservationCachingService reservationCachingService;
+  @Autowired private TupleChunkMetaDataStorageService tupleChunkMetaDataStorageService;
+
+  private final TupleType testTupleType = TupleType.MULTIPLICATION_TRIPLE_GFP;
+  private final UUID testChunkId = UUID.fromString("d1ea9d52-2b1d-42f0-85eb-e36caa6a623c");
+  private final long tuplesInChunk = 100;
+  private final long tuplesToReserve = 3;
+
+  @Before
+  public void setUp() {
+    testEnvironment.clearAllData();
+    tupleChunkMetaDataStorageService.keepTupleChunkData(testChunkId, testTupleType, tuplesInChunk);
+    tupleChunkMetaDataStorageService.activateTupleChunk(testChunkId);
+  }
+
+  @Test
+  public void
+      givenSubsequentReservationIsProcessedFirst_whenMasterSharesReservationOnParallelRequests_thenSucceedAsExpected() {
+    Reservation firstReservation =
+        new Reservation(
+            "1636913e-87b7-4331-97d7-4b14a1552604",
+            testTupleType,
+            Collections.singletonList(new ReservationElement(testChunkId, tuplesToReserve, 0)));
+    Reservation secondReservation =
+        new Reservation(
+            "9b77009e-313e-4aa9-b0d0-da0235329139",
+            testTupleType,
+            Collections.singletonList(
+                new ReservationElement(testChunkId, tuplesToReserve, tuplesToReserve)));
+    reservationCachingService.keepReservation(secondReservation);
+    assertEquals(
+        Try.success(null),
+        Try.run(() -> reservationCachingService.keepReservation(firstReservation)));
+  }
+}