Add new Method

src/main/java/mate/academy/Main.java

@@ -1,9 +1,11 @@
 package mate.academy;
 
 import mate.academy.service.AuthenticationService;
+import mate.academy.service.UserService;
 
 public class Main {
-    private static final AuthenticationService authenticationService = new AuthenticationService();
+    private static final AuthenticationService authenticationService =
+            new AuthenticationService(new UserService());
 
     public static void main(String[] args) {
         test("[email protected]", "1234", true);

src/main/java/mate/academy/model/User.java

@@ -13,7 +13,15 @@ public String getEmail() {
         return email;
     }
 
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
     public String getPassword() {
         return password;
     }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
 }

src/main/java/mate/academy/service/AuthenticationService.java

@@ -1,16 +1,29 @@
 package mate.academy.service;
 
+import mate.academy.model.User;
+
 public class AuthenticationService {
+    private final UserService userService;
+
+    public AuthenticationService(UserService userService) {
+        this.userService = userService;
+    }
     /**
      * Imagine that some user wants to login to your site.
      * You should check if user credentials (login and password) are valid or not.
      * All users are stored in <code>UserService</code> class.
-     * @param email - user's email
+     *
+     * @param email    - user's email
      * @param password - user's password
      * @return true if user by email exists and passed password is equal to user's password.
      * Return false in any other cases.
      */
+
     public boolean login(String email, String password) {
-        return false;
+        User user = userService.findByEmail(email);
+        if (user == null) {
+            return false;
+        }
+        return user.getPassword().equals(password);
     }
 }

src/main/java/mate/academy/service/UserService.java

@@ -15,6 +15,11 @@ public class UserService {
      * Return <code>null</code> if there is no suitable user
      */
     public User findByEmail(String email) {
+        for (User user : users) {
+            if (user.getEmail().equals(email)) {
+                return user;
+            }
+        }
         return null;
     }
 }