Improve unit-tests

Author: Bartosz Litwiniuk

backtrace-library/src/androidTest/java/backtraceio/library/database/BacktraceDatabaseContextMultithreadedTest.java

@@ -61,7 +61,7 @@ public void setUp() {
     @Test
     public void testConcurrentModification() throws InterruptedException {
         // GIVEN
-        final TestConfig config = new TestConfig(100, 50, 75, 2000);
+        final TestConfig config = new TestConfig(500, 250, 150, 2000);
         final List<BacktraceDatabaseRecord> initialRecords = generateMockRecords(config.recordsState);
 
         final CountDownLatch startLatch = new CountDownLatch(1);

backtrace-library/src/main/java/backtraceio/library/services/BacktraceDatabaseContext.java

@@ -220,7 +220,7 @@ public boolean delete(BacktraceDatabaseRecord record) {
                     return true;
                 } catch (Exception e) {
                     BacktraceLogger.d(LOG_TAG, "Exception on removing record "
-                            + databaseRecord.id.toString() + "from db context: " + e.getMessage());
+                            + databaseRecord.id + " from db context: " + e.getMessage());
                 }
             }
         }