Added test to add shift test suite (i forgot to push this for the alpha sadge)

SchedulerApp/src/main/java/com/example/schedulerapp/TestModel.java

@@ -39,7 +39,7 @@ public class TestModel {
         testModel.printAllEmployees();
         System.out.println("employees size: " + testModel.employeeSize());
 
-        // Make the schedule (Add shifts)
+        // Make the schedule (Add shifts) Rafi's Test Suite
 
         System.out.println();
         System.out.println("Making the schedule (Add shifts) Test Suite:\nAdding Freya and Mike as employees.");
@@ -81,6 +81,20 @@ public class TestModel {
         System.out.println("Actual output: ...");
         testModel.printAllShifts();
 
+        System.out.println();
+        System.out.println("Adding the same shift for Mike from 5-9 on March-03-2022.");
+        testModel.addShift(3, "2022-03-13", 1700, 2100);
+
+        try {
+            TimeUnit.SECONDS.sleep(1);
+        } catch (InterruptedException exception) {
+            System.out.println("Sleep");
+        }
+
+        System.out.println("Expected output: [allShifts, 2.2022-03-13.900.1700.1, 3.2022-03-13.1700.2100.2] ");
+        System.out.println("Actual output: ...");
+        testModel.printAllShifts();
+
         testModel.removeEmployee("2");
         testModel.removeEmployee("3");