feat: adds Employee.java test and getDetails Method

Author: haldanek

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

@@ -50,4 +50,8 @@ public boolean containsKey(Object id2) {
     // TODO Auto-generated method stub
     throw new UnsupportedOperationException("Unimplemented method 'containsKey'");
   }
+
+  public Employee getDetails(Employee employee) {
+    return employee;
+  }
 }

lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/EmployeeTest.java

@@ -0,0 +1,19 @@
+package com.codedifferently.lesson15;
+
+import static org.assertj.core.api.Assertions.*;
+
+import org.junit.jupiter.api.Test;
+
+public class EmployeeTest {
+  private Employee employee;
+
+  @Test
+  void testGetDetails() {
+    // Arrange
+    employee = new Employee(1, "Jet Li", "Specialist", 110.00);
+    // Act
+    Employee actualDetails = employee.getDetails(employee);
+    // Assert
+    assertThat(actualDetails).isEqualTo(employee);
+  }
+}