Add unit test for OpenDatabaseHook priority.

bramble-core/src/test/java/org/briarproject/bramble/lifecycle/LifecycleManagerImplTest.java

+package org.briarproject.bramble.lifecycle;
+
+import org.briarproject.bramble.api.crypto.SecretKey;
+import org.briarproject.bramble.api.db.DatabaseComponent;
+import org.briarproject.bramble.api.db.Transaction;
+import org.briarproject.bramble.api.event.EventBus;
+import org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook;
+import org.briarproject.bramble.api.lifecycle.event.LifecycleEvent;
+import org.briarproject.bramble.test.BrambleMockTestCase;
+import org.briarproject.bramble.test.DbExpectations;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import static java.util.Arrays.asList;
+import static org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook.Priority.EARLY;
+import static org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook.Priority.LATE;
+import static org.briarproject.bramble.api.lifecycle.LifecycleManager.OpenDatabaseHook.Priority.NORMAL;
+import static org.briarproject.bramble.api.lifecycle.LifecycleManager.StartResult.SUCCESS;
+import static org.briarproject.bramble.test.TestUtils.getSecretKey;
+import static org.junit.Assert.assertEquals;
+
+public class LifecycleManagerImplTest extends BrambleMockTestCase {
+
+	private final DatabaseComponent db = context.mock(DatabaseComponent.class);
+	private final EventBus eventBus = context.mock(EventBus.class);
+
+	private final SecretKey dbKey = getSecretKey();
+
+	private LifecycleManagerImpl lifecycleManager;
+
+	@Before
+	public void setUp() {
+		lifecycleManager = new LifecycleManagerImpl(db, eventBus);
+	}
+
+	@Test
+	public void testOpenDatabaseHooksRunInOrderOfPriority() throws Exception {
+		Transaction txn = new Transaction(null, false);
+		List<Integer> results = new ArrayList<>();
+		OpenDatabaseHook hook1 = transaction -> results.add(1);
+		OpenDatabaseHook hook2 = transaction -> results.add(2);
+		OpenDatabaseHook hook3 = transaction -> results.add(3);
+
+		context.checking(new DbExpectations() {{
+			oneOf(db).open(dbKey, lifecycleManager);
+			will(returnValue(false));
+			oneOf(db).transaction(with(false), withDbRunnable(txn));
+			allowing(eventBus).broadcast(with(any(LifecycleEvent.class)));
+		}});
+
+		lifecycleManager.registerOpenDatabaseHook(hook1, LATE);
+		lifecycleManager.registerOpenDatabaseHook(hook2, NORMAL);
+		lifecycleManager.registerOpenDatabaseHook(hook3, EARLY);
+
+		assertEquals(SUCCESS, lifecycleManager.startServices(dbKey));
+		assertEquals(asList(3, 2, 1), results);
+	}
+}