diff --git a/lesson_14/exceptions/exceptions_app/src/test/java/com/codedifferently/lesson14/ecommerce/EcommerceSystemTest.java b/lesson_14/exceptions/exceptions_app/src/test/java/com/codedifferently/lesson14/ecommerce/EcommerceSystemTest.java
index 52194dfa3..2f936dbd9 100644
--- a/lesson_14/exceptions/exceptions_app/src/test/java/com/codedifferently/lesson14/ecommerce/EcommerceSystemTest.java
+++ b/lesson_14/exceptions/exceptions_app/src/test/java/com/codedifferently/lesson14/ecommerce/EcommerceSystemTest.java
@@ -2,7 +2,6 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatThrownBy;
-
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 
diff --git a/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java
index 49aaabbd7..11e2b9fbf 100644
--- a/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java
+++ b/lesson_15/tdd/tdd_app/src/main/java/com/codedifferently/lesson15/Employee.java
@@ -45,4 +45,8 @@ public double getSalary() {
   public void setSalary(double salary) {
     this.salary = salary;
   }
+  
+  public String getDetails(){
+    return "ID: " + id + ", Name: " + name + ", Department: " + department + ", Salary: " + salary;
+  }
 }
diff --git a/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java b/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java
index cd6ef511e..a7794b461 100644
--- a/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java
+++ b/lesson_15/tdd/tdd_app/src/test/java/com/codedifferently/lesson15/Lesson15Test.java
@@ -1,7 +1,7 @@
 package com.codedifferently.lesson15;
 
 import static org.assertj.core.api.Assertions.assertThat;
-
+import static org.junit.jupiter.api.Assertions.assertEquals;
 import org.junit.jupiter.api.Test;
 
 class Lesson15Test {
@@ -16,4 +16,67 @@ public void testGetGreeting() {
     // Act
     Lesson15.main(null);
   }
+
+  @Test
+  public void testEmployeeId_Exists(){
+    Employee employee = new Employee(0, null, null, 0);
+    assertEquals(0, employee.getId());
+  }
+
+  @Test
+  public void testEmployeeName_Exists(){
+    Employee employee = new Employee(0, "dave", null, 0);
+    assertEquals("dave", employee.getName());
+  }
+@Test
+  public void testEmployeeDepartment_Exists(){
+    Employee employee = new Employee(0, "dave", "IT", 0);
+    assertEquals("IT", employee.getDepartment());
+  }
+  @Test
+  public void testEmployeeSalary_Exists(){
+    Employee employee = new Employee(0, "dave", "IT", 10000);
+    assertEquals(10000, employee.getSalary());
+  }
+  @Test
+  public void testGetEmployee(){
+    Employee employee = new Employee(10, null, null, 0);
+    EmployeeManager manager = new EmployeeManager();
+    manager.addEmployee(employee);
+    assertEquals(employee, manager.getEmployee(10));
+  }
+  @Test
+  public void testGetEmployeeCount(){
+    Employee employee = new Employee(10, null, null, 0);
+    EmployeeManager manager = new EmployeeManager();
+    manager.addEmployee(employee);
+    assertEquals(1, manager.getEmployeeCount());
+}
+ @Test
+  public void testGetEmployeeUpate(){
+    Employee employee2 = new Employee(10, "BillyBobJenkins", null, 0);
+    Employee employee = new Employee(10, "Dave", null, 0);
+    EmployeeManager manager = new EmployeeManager();
+    manager.addEmployee(employee);
+    manager.updateEmployee(employee2);
+
+    assertEquals(employee2, manager.getEmployee(10));
+}
+@Test
+  public void testGetEmployeeRemove(){
+    Employee employee2 = new Employee(10, "BillyBobJenkins", null, 0);
+    Employee employee = new Employee(11, "Dave", null, 0);
+    EmployeeManager manager = new EmployeeManager();
+    manager.addEmployee(employee);
+    manager.addEmployee(employee2);
+    manager.removeEmployee(10);
+
+    assertEquals(1, manager.getEmployeeCount());
+}
+@Test
+  public void testGetDetails(){
+    Employee employee2 = new Employee(10, "BillyBobJenkins", "IT", 10);
+assertEquals("ID: 10, Name: BillyBobJenkins, Department: IT, Salary: 10.0", employee2.getDetails());
+
 }
+}
\ No newline at end of file