feature: add a repository method that can delete a user

src/User/Domain/ValueObject/UserRepositoryInterface.php

@@ -15,4 +15,6 @@ public function findById(UserId $userId): User;
 
     public function findByEmail(Email $email): User;
     public function exists(Email $email, Password $password): bool;
+
+    public function delete(UserId $userId): void;
 }

src/User/Infrastructure/Repository/UserRepositoryInMemory.php

@@ -54,4 +54,9 @@ public function exists(Email $email, Password $password): bool
         });
         return count($filteredArray) > 0;
     }
+
+    public function delete(UserId $userId): void
+    {
+        unset($this->users[$userId->toString()]);
+    }
 }

src/User/Infrastructure/Repository/UserRepositoryInMySQL.php

@@ -81,4 +81,12 @@ public function exists(Email $email, Password $password): bool
         }
         return true;
     }
+
+    public function delete(UserId $userId): void
+    {
+        $stmt = $this->mysqli->prepare("DELETE FROM users WHERE user_id=?");
+        $userIdString = $userId->toString();
+        $stmt->bind_param('s', $userIdString);
+        $stmt->execute();
+    }
 }

tests/User/Infrastructure/Repository/UserRepositoryTest.php

@@ -63,4 +63,14 @@ public function testCanCheckIfAUserExists(UserRepositoryInterface $userRepositor
         $exists = $userRepository->exists($user->getEmail(), $user->getPassword());
         self::assertTrue($exists);
     }
+
+    /** @dataProvider dataProvider() */
+    public function testCanDeleteAUser(UserRepositoryInterface $userRepository): void
+    {
+        $user = Users::aUser();
+        $userRepository->save($user);
+        $userRepository->delete($user->getId());
+        $this->expectException(UserNotFoundException::class);
+        $userRepository->findById($user->getId());
+    }
 }