Group testing modules (#3014)

* move security content from spring-security-rest-full

* swagger update

* move query language to new module

* rename spring-security-rest-full to spring-rest-full

* group persistence modules

* group testing modules

* try fix conflict

testing-modules/testng/src/test/java/com/baeldung/MultiThreadedIntegrationTest.java

@@ -0,0 +1,14 @@
+package com.baeldung;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+public class MultiThreadedIntegrationTest {
+
+    @Test(threadPoolSize = 5, invocationCount = 10, timeOut = 1000)
+    public void givenMethod_whenRunInThreads_thenCorrect() {
+        int count = Thread.activeCount();
+        Assert.assertTrue(count > 1);
+    }
+
+}