feat: add lesson 15 employee and manager tests

Author: OliviaxJames

.vscode/settings.json

@@ -15,4 +15,5 @@
     "[javascriptreact]": {
         "editor.defaultFormatter": "esbenp.prettier-vscode"
     },
+    "java.debug.settings.onBuildFailureProceed": true,
 }

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

@@ -5,17 +5,19 @@ public class Employee {
   private String name;
   private String department;
   private double salary;
+  
 
   public Employee(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; //done
+    return id;
   }
 
   public void setId(int id) {
@@ -45,4 +47,13 @@ public double getSalary() {
   public void setSalary(double salary) {
     this.salary = salary;
   }
+
+  // public String getDetails(String details) {
+  //     return details;
+  // }
+
+  public String getDetails() {
+    return id+ " " + name + " " + department + " " + salary;
+}
+
 }

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

@@ -41,3 +41,4 @@ public int getEmployeeCount() {
     return employees.size();
   }
 }
+

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

@@ -67,7 +67,6 @@ public void getDetails(){
 
 }
 
-
 }