write tests in the unit tests project

Author: RMillerCohort251

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

@@ -13,6 +13,24 @@ public Employee(int id, String name, String department, double salary) {
     this.salary = salary;
   }
 
+  public String getDetails() {
+    return "Employee's ID: "
+        + id
+        + " Name: "
+        + name
+        + " Department: "
+        + department
+        + " Salary: "
+        + 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

@@ -3,6 +3,17 @@
 public class Lesson15 {
 
   public static void main(String[] args) {
-    System.out.println("Hello, World!");
+    System.out.println(getGreeting()); // This line is needed!
+
+    Employee emp = new Employee(1, "Rasheed Miller", "IT", 50000.0);
+    System.out.println(emp.getDetails());
+  }
+
+  public static String getGreeting() {
+    return "Hello, World!";
+  }
+
+  public static Employee createSampleEmployee() {
+    return new Employee(1, "Rasheed Miller", "IT", 50000.0);
   }
 }

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

@@ -0,0 +1,44 @@
+package com.codedifferently.lesson15;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+public class EmployeeManagerTest {
+  @Test
+  public void testAddEmployee() {
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employeeManager.addEmployee(employee);
+    assertThat(employeeManager.getEmployeeCount()).isEqualTo(1);
+  }
+
+  @Test
+  public void testGetEmployee() {
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employeeManager.addEmployee(employee);
+    Employee result = employeeManager.getEmployee(1);
+    assertThat(result).isEqualTo(employee);
+  }
+
+  @Test
+  public void testUpdateEmployee() {
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employeeManager.addEmployee(employee);
+    employee.setName("John Doe");
+    employeeManager.updateEmployee(employee);
+    Employee result = employeeManager.getEmployee(1);
+    assertThat(result.getName()).isEqualTo("John Doe");
+  }
+
+  @Test
+  public void testRemoveEmployee() {
+    EmployeeManager employeeManager = new EmployeeManager();
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employeeManager.addEmployee(employee);
+    employeeManager.removeEmployee(1);
+    assertThat(employeeManager.getEmployeeCount()).isEqualTo(0);
+  }
+}

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

@@ -0,0 +1,80 @@
+package com.codedifferently.lesson15;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+public class EmployeeTest {
+  @Test
+  public void testGetId() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    int id = employee.getId();
+    assertThat(id).isEqualTo(1);
+  }
+
+  @Test
+  public void testSetId() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employee.setId(2);
+    assertThat(employee.getId()).isEqualTo(2);
+  }
+
+  @Test
+  public void testGetName() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    String name = employee.getName();
+    assertThat(name).isEqualTo("Rasheed Miller");
+  }
+
+  @Test
+  public void testSetName() {
+    Employee employee = new Employee(2, "Rasheed Miller", "IT", 50000);
+    employee.setName("John Doe");
+    assertThat(employee.getName()).isEqualTo("John Doe");
+  }
+
+  @Test
+  public void testGetDepartment() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    String department = employee.getDepartment();
+    assertThat(department).isEqualTo("IT");
+  }
+
+  @Test
+  public void testSetDepartment() {
+    Employee employee = new Employee(2, "Rasheed Miller", "IT", 50000);
+    employee.setDepartment("HR");
+    assertThat(employee.getDepartment()).isEqualTo("HR");
+  }
+
+  @Test
+  public void testGetSalary() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    double salary = employee.getSalary();
+    assertThat(salary).isEqualTo(50000);
+  }
+
+  @Test
+  public void testSetSalary() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employee.setSalary(50000);
+    assertThat(employee.getSalary()).isEqualTo(50000);
+  }
+
+  @Test
+  public void testGetDetails() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    String details = employee.getDetails();
+    assertThat(details)
+        .isEqualTo("Employee's ID: 1 Name: Rasheed Miller Department: IT Salary: 50000.0");
+  }
+
+  @Test
+  public void testSetDetails() {
+    Employee employee = new Employee(1, "Rasheed Miller", "IT", 50000);
+    employee.setDetails(2, "John Doe", "HR", 50000);
+    String result = employee.getDetails();
+    String expected = "Employee's ID: 2 Name: John Doe Department: HR Salary: 50000.0";
+    assertThat(result).isEqualTo(expected);
+  }
+}

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

@@ -2,18 +2,44 @@
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
 import org.junit.jupiter.api.Test;
 
-class Lesson15Test {
+public class Lesson15Test {
 
   @Test
-  public void testLesson15() {
-    assertThat(new Lesson15()).isNotNull();
+  public void testMainPrintsGreetingAndEmployeeDetails() {
+    // Capture console output
+    PrintStream originalOut = System.out;
+    ByteArrayOutputStream outContent = new ByteArrayOutputStream();
+    System.setOut(new PrintStream(outContent));
+
+    // Execute main
+    Lesson15.main(new String[] {});
+
+    // Restore System.out
+    System.setOut(originalOut);
+
+    // Get output and verify
+    String output = outContent.toString().trim();
+    assertThat(output).contains("Hello, World!");
+    assertThat(output)
+        .contains("Employee's ID: 1 Name: Rasheed Miller Department: IT Salary: 50000.0");
+  }
+
+  @Test
+  public void testGetGreetingReturnsHelloWorld() {
+    String greeting = Lesson15.getGreeting();
+    assertThat(greeting).isEqualTo("Hello, World!");
   }
 
   @Test
-  public void testGetGreeting() {
-    // Act
-    Lesson15.main(null);
+  public void testCreateSampleEmployee() {
+    Employee emp = Lesson15.createSampleEmployee();
+    assertThat(emp.getId()).isEqualTo(1);
+    assertThat(emp.getName()).isEqualTo("Rasheed Miller");
+    assertThat(emp.getDepartment()).isEqualTo("IT");
+    assertThat(emp.getSalary()).isEqualTo(50000.0);
   }
 }