From 6dddabb7dfb498748436c9b206d5fc9d9f279563 Mon Sep 17 00:00:00 2001
From: Jagepard <dankorot@gmail.com>
Date: Wed, 7 Aug 2019 16:49:32 +0300
Subject: [PATCH 1/4] Add InvalidArgumentException

---
 src/FootballSubject.php | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/FootballSubject.php b/src/FootballSubject.php
index 390d1ea..4d3be75 100755
--- a/src/FootballSubject.php
+++ b/src/FootballSubject.php
@@ -9,10 +9,6 @@
 
 namespace Behavioral\Observer;
 
-/**
- * Class FootballSubject
- * @package Behavioral\Observer
- */
 class FootballSubject implements SubjectInterface
 {
     /**
@@ -35,9 +31,14 @@ public function __construct(string $name)
 
     /**
      * @param ObserverInterface $observer
+     * @throws \Exception
      */
     public function attachObserver(ObserverInterface $observer): void
     {
+        if (array_key_exists($observer->getName(), $this->observers)) {
+            throw new \InvalidArgumentException('Observer is already exist');
+        }
+
         $this->observers[$observer->getName()] = $observer;
     }
 
@@ -47,7 +48,7 @@ public function attachObserver(ObserverInterface $observer): void
     public function detachObserver(string $name): void
     {
         if (!array_key_exists($name, $this->observers)) {
-            throw new \InvalidArgumentException();
+            throw new \InvalidArgumentException('Observer is not exist');
         }
 
         unset($this->observers[$name]);

From c06814a9978ad0dda634ff944fc1c311d667957e Mon Sep 17 00:00:00 2001
From: Jagepard <dankorot@gmail.com>
Date: Wed, 7 Aug 2019 16:49:53 +0300
Subject: [PATCH 2/4] Update

---
 src/EventInterface.php | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/EventInterface.php b/src/EventInterface.php
index 093c613..5893212 100755
--- a/src/EventInterface.php
+++ b/src/EventInterface.php
@@ -7,10 +7,6 @@
 
 namespace Behavioral\Observer;
 
-/**
- * Interface EventInterface
- * @package Behavioral\Observer
- */
 interface EventInterface
 {
     /**

From 1d7f0073230ebeeb4d848caf956a1403c365fac5 Mon Sep 17 00:00:00 2001
From: Jagepard <dankorot@gmail.com>
Date: Wed, 7 Aug 2019 16:50:15 +0300
Subject: [PATCH 3/4] Update

---
 src/FootballEvent.php | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/src/FootballEvent.php b/src/FootballEvent.php
index 00ee352..64f135b 100755
--- a/src/FootballEvent.php
+++ b/src/FootballEvent.php
@@ -9,10 +9,6 @@
 
 namespace Behavioral\Observer;
 
-/**
- * Class FootballEvent
- * @package Behavioral\Observer
- */
 class FootballEvent implements EventInterface
 {
     const GOAL = 'Goal!!!';

From ff900c2cfb4babb00649fc9307dc0c816edb249d Mon Sep 17 00:00:00 2001
From: Jagepard <dankorot@gmail.com>
Date: Wed, 7 Aug 2019 16:52:01 +0300
Subject: [PATCH 4/4] Update

---
 src/FootballObserver.php  | 4 ----
 src/ObserverInterface.php | 4 ----
 src/SubjectInterface.php  | 4 ----
 tests/ObserverTest.php    | 4 ----
 4 files changed, 16 deletions(-)

diff --git a/src/FootballObserver.php b/src/FootballObserver.php
index b0b4e49..b8e34cc 100755
--- a/src/FootballObserver.php
+++ b/src/FootballObserver.php
@@ -9,10 +9,6 @@
 
 namespace Behavioral\Observer;
 
-/**
- * Class FootballObserver
- * @package Behavioral\Observer
- */
 class FootballObserver implements ObserverInterface
 {
     /**
diff --git a/src/ObserverInterface.php b/src/ObserverInterface.php
index 4f9d52a..bcff9cd 100755
--- a/src/ObserverInterface.php
+++ b/src/ObserverInterface.php
@@ -7,10 +7,6 @@
 
 namespace Behavioral\Observer;
 
-/**
- * Interface ObserverInterface
- * @package Behavioral\Observer
- */
 interface ObserverInterface
 {
     /**
diff --git a/src/SubjectInterface.php b/src/SubjectInterface.php
index 4e16d5c..4dd94e3 100755
--- a/src/SubjectInterface.php
+++ b/src/SubjectInterface.php
@@ -7,10 +7,6 @@
 
 namespace Behavioral\Observer;
 
-/**
- * Interface SubjectInterface
- * @package Behavioral\Observer
- */
 interface SubjectInterface
 {
     /**
diff --git a/tests/ObserverTest.php b/tests/ObserverTest.php
index d158db0..150b45f 100755
--- a/tests/ObserverTest.php
+++ b/tests/ObserverTest.php
@@ -15,10 +15,6 @@
 use Behavioral\Observer\SubjectInterface;
 use PHPUnit\Framework\TestCase as PHPUnit_Framework_TestCase;
 
-/**
- * Class ObserverTest
- * @package Behavioral\Observer\Tests
- */
 class ObserverTest extends PHPUnit_Framework_TestCase
 {
     /**