feat: adds employee details methods and updates tests

Author: Ezra Nyabuti

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

@@ -13,6 +13,17 @@ public Employee(int id, String name, String department, double salary) {
     this.salary = salary;
   }
 
+  public String getDetails() {
+    return id + ", " + name + ", " + department + "," + salary;
+  }
+
+  public void setDetails(int id, String name, String department, double salary) {
+    this.id = id;
+    this.name = name;
+    this.department = department;
+    this.salary = salary;
+  }
+
   // Getters and setters
   public int getId() {
     return id;

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

@@ -5,9 +5,4 @@ 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

@@ -12,11 +12,16 @@ public void testLesson15() {
   }
 
   @Test
-  public void testGetGreeting() {
+  public void testGetGreeting() {}
+
+  @Test
+  public void testGetDetails() {
+    // Arrange
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 100000);
     // Act
-    String greeting = new Lesson15().getGreeting("World");
+    String details = employee.getDetails();
     // Assert
-    assertThat(greeting).isEqualTo("Hello, World!");
+    assertThat(details).isEqualTo("1, Ezra Nyabuti, Software Engineer,100000.0");
   }
 
   @Test
@@ -53,6 +58,19 @@ public void testGetEmployee() {
     assertThat(retrievedEmployee).isEqualTo(employee);
   }
 
+  @Test
+  public void testUpdateEmployee() {
+    // Arrange
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 100000);
+    employeeManager.addEmployee(employee);
+    // Act
+    employee.setName("Ezra Nyabuti Makini");
+    employeeManager.updateEmployee(employee);
+    // Assert
+    assertThat(employeeManager.getEmployee(1).getName()).isEqualTo("Ezra Nyabuti Makini");
+  }
+
   @Test
   public void testRemoveEmployee() {
     // Arrange
@@ -80,9 +98,9 @@ public void testSetId() {
     // Arrange
     Employee employee = new Employee(1, "Ezra Nyabuti", "Software Engineer", 0);
     // Act
-    employee.setId(2);
+    employee.setId(1);
     // Assert
-    assertThat(employee.getId()).isEqualTo(2);
+    assertThat(employee.getId()).isEqualTo(1);
   }
 
   @Test