fix: fixed test files

Author: haldanek

lesson_15/tdd/tdd_app/src/test/EmployeeManagerTest.java

@@ -0,0 +1,52 @@
+package com.codedifferently.lesson15;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+class Lesson15Test {
+
+  private EmployeeManager manager;
+  private Employee emp;
+
+  @BeforeEach
+  public void setUp() {
+    manager = new EmployeeManager();
+    emp = new Employee(1, "Edgar Allen Poe", "Writer", 0.0);
+  }
+
+  @Test
+  public void testAddEmployee() {
+    // Act
+    manager.addEmployee(emp);
+    // Assert
+    assertEquals(1, manager.getEmployeeCount());
+    assertEquals(emp, manager.getEmployee(1));
+  }
+
+  @Test
+  public void testGetEmployee() {
+    // Arrange
+    manager.addEmployee(emp);
+    Employee expectedValue = emp;
+    // Act
+    Employee actualValue = manager.getEmployee(1);
+    // Assert
+    assertEquals(expectedValue, actualValue, "The value retrieved should match the value added.");
+  }
+
+  @Test
+  public void testUpdateEmployee() {
+    // Arrange
+    manager.addEmployee(emp);
+    Employee updatedEmployee = new Employee(1, "Frankenstein", "Admin", 0.0);
+    // Act
+    manager.updateEmployee(updatedEmployee);
+    // Assert
+    assertEquals(
+        updatedEmployee,
+        manager.getEmployee(1),
+        "Updated employee details should match the new information.");
+  }
+}

lesson_15/tdd/tdd_app/src/test/EmployeeTest.java

@@ -0,0 +1,3 @@
+public class EmployeeTest {
+    
+}