feat: adds getDetails method to Employee class and tests for Employee functionality

Author: nia-source

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

@@ -13,6 +13,11 @@ public Employee(int id, String name, String department, double salary) {
     this.salary = salary;
   }
 
+  public String getDetails() {
+    return String.format(
+        "Employee ID: %d, Name: %s, Department: %s, Salary: %.0f", id, name, department, salary);
+  }
+
   // Getters and setters
   public int getId() {
     return id;
@@ -45,4 +50,4 @@ public double getSalary() {
   public void setSalary(double salary) {
     this.salary = salary;
   }
-}
+}

lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Employee.Test

@@ -1,7 +1,6 @@
 package com.codedifferently.lesson15;
 
 import static org.assertj.core.api.Assertions.assertThat;
-
 import org.junit.jupiter.api.Test;
 
 class Lesson15Test {
@@ -16,4 +15,10 @@ public void testGetGreeting() {
     // Act
     Lesson15.main(null);
   }
+
+  @Test
+  public void getId() {
+    Employee employee = new Employee(1, "Nia Pack", "Communications", 75000.00);
+    assertThat(employee.getId()).isEqualTo(1);
+  }
 }