feat: adds greeting method and employee management tests

Author: Ezra Nyabuti

lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Lesson15.java

@@ -5,4 +5,9 @@ public class Lesson15 {
   public static void main(String[] args) {
     System.out.println("Hello, World!");
   }
+
+  public String getGreeting(String string) {
+    // This method should return a greeting message
+    return "Hello, " + string + "!";
+  }
 }

lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java

@@ -14,6 +14,134 @@ public void testLesson15() {
   @Test
   public void testGetGreeting() {
     // Act
-    Lesson15.main(null);
+    String greeting = new Lesson15().getGreeting("World");
+    // Assert
+    assertThat(greeting).isEqualTo("Hello, World!");
+  }
+
+  @Test
+  public void employeeManagerTest() {
+    // Arrange
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    employeeManager.addEmployee(employee);
+    // Assert
+    assertThat(employeeManager.getEmployeeCount()).isEqualTo(1);
+  }
+
+  @Test
+  public void testAddEmployee() {
+    // Arrange
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    employeeManager.addEmployee(employee);
+    // Assert
+    assertThat(employeeManager.getEmployeeCount()).isEqualTo(1);
+  }
+
+  @Test
+  public void testGetEmployee() {
+    // Arrange
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    employeeManager.addEmployee(employee);
+    // Act
+    Employee retrievedEmployee = employeeManager.getEmployee(1);
+    // Assert
+    assertThat(retrievedEmployee).isEqualTo(employee);
+  }
+
+  @Test
+  public void testRemoveEmployee() {
+    // Arrange
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    employeeManager.addEmployee(employee);
+    // Act
+    employeeManager.removeEmployee(1);
+    // Assert
+    assertThat(employeeManager.getEmployeeCount()).isEqualTo(0);
+  }
+
+  @Test
+  public void testGetid() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    int id = employee.getId();
+    // Assert
+    assertThat(id).isEqualTo(1);
+  }
+
+  @Test
+  public void testSetId() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    employee.setId(2);
+    // Assert
+    assertThat(employee.getId()).isEqualTo(2);
+  }
+
+  @Test
+  public void testGetName() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    String name = employee.getName();
+    // Assert
+    assertThat(name).isEqualTo("Ezra Nyabuti");
+  }
+
+  @Test
+  public void testSetName() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    employee.setName("Ezra Nyabuti");
+    // Assert
+    assertThat(employee.getName()).isEqualTo("Ezra Nyabuti");
+  }
+
+  @Test
+  public void testGetDepartment() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    String department = employee.getDepartment();
+    // Assert
+    assertThat(department).isEqualTo("Software Engineer");
+  }
+
+  @Test
+  public void testSetDepartment() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
+    // Act
+    employee.setDepartment("Data Scientist");
+    // Assert
+    assertThat(employee.getDepartment()).isEqualTo("Data Scientist");
+  }
+
+  @Test
+  public void testGetSalary() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 100000);
+    // Act
+    double salary = employee.getSalary();
+    // Assert
+    assertThat(salary).isEqualTo(100000);
+  }
+
+  @Test
+  public void testSetSalary() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 100000);
+    // Act
+    employee.setSalary(120000);
+    // Assert
+    assertThat(employee.getSalary()).isEqualTo(120000);
   }
 }