fix:lesson_15 add get details criteria

Author: txtran224

lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java

@@ -45,4 +45,15 @@ public double getSalary() {
   public void setSalary(double salary) {
     this.salary = salary;
   }
+
+  public String getDetails() {
+    return "Employee ID "
+        + this.id
+        + ", Name "
+        + this.getName()
+        + ", Department "
+        + this.getDepartment()
+        + ", Salary "
+        + this.getSalary();
+  }
 }

lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/Employee/EmployeeTest.java

@@ -49,4 +49,13 @@ void testSalary() {
     // Assert
     assertEquals(50000.0, salary);
   }
+
+  @Test
+  void getDetails() {
+
+    String expected = "Employee ID 1545, Name Ray Allen, Department Lavatory, Salary 50000.0";
+    String actual = employee.getDetails();
+
+    assertEquals(expected, actual);
+  }
 }