Refactor integration tests to allow clock to be replaced.

bramble-core/src/test/java/org/briarproject/bramble/test/BrambleCoreIntegrationTestModule.java

@@ -14,6 +14,7 @@ import dagger.Provides;
 		DefaultEventExecutorModule.class,
 		DefaultTaskSchedulerModule.class,
 		DefaultWakefulIoExecutorModule.class,
+		TestClockModule.class,
 		TestDatabaseConfigModule.class,
 		TestPluginConfigModule.class,
 		TestSecureRandomModule.class

bramble-core/src/test/java/org/briarproject/bramble/test/TestClockModule.java

@@ -0,0 +1,28 @@
+package org.briarproject.bramble.test;
+
+import org.briarproject.bramble.api.system.Clock;
+import org.briarproject.bramble.system.SystemClock;
+
+import java.util.concurrent.atomic.AtomicLong;
+
+import dagger.Module;
+import dagger.Provides;
+
+@Module
+public class TestClockModule {
+
+	private final Clock clock;
+
+	public TestClockModule() {
+		clock = new SystemClock();
+	}
+
+	public TestClockModule(AtomicLong time) {
+		clock = new SettableClock(time);
+	}
+
+	@Provides
+	Clock provideClock() {
+		return clock;
+	}
+}