added a test for Mutex properties of the locking system

src/test/java/JobServ/ProcessManagerTestImplementation.java

@@ -0,0 +1,41 @@
+/*
+ * ProcessManagerTestImplementation
+ *
+ * v1.0
+ *
+ * May 23, 2019
+ */
+
+
+package JobServ;
+
+import java.util.concurrent.TimeoutException;
+
+/*
+ * ProcessManagerTestImplementation
+ * inherits ProcessManager and adds useful functions for testing
+ */
+class ProcessManagerTestImplementation extends ProcessManager {
+
+    public void longCallHoldsLock() {
+        try {
+            super.getLock();
+            System.err.println("[1] Long Call Has Lock");
+
+            // hold lock for 7 seconds, more than double normal timeout.
+            Thread.sleep(4000);
+
+            super.releaseLock();
+
+        } catch (TimeoutException e) {
+            System.err.println("[!!] Long Call wasnt able to grab lock!");
+            return;
+
+        } catch (InterruptedException e) {
+            super.releaseLock();
+            System.err.println("[3] Released lock: interrupted");
+            return;
+        }
+    }
+
+}