Added Unit Test

Author: byjg

.travis.yml

@@ -0,0 +1,13 @@
+language: php
+php:
+  - "7.2"
+  - "7.1"
+  - "7.0"
+  - "5.6"
+
+install:
+  - composer install
+
+script: 
+  - vendor/bin/phpunit
+

composer.json

@@ -1,18 +1,20 @@
 {
-    "name": "byjg/singleton-pattern",
-    "version": "1.0.1",
-    "description": "A lightweight PHP implementation of the Design Pattern Singleton using trait.",
-    "authors": [
-        {
-            "name": "João Gilberto Magalhães",
-            "email": "joao@byjg.com.br"
-        }
-    ],
-    "autoload": {
-        "psr-4": {
-            "ByJG\\DesignPattern\\": "src/"
-        }
-    },
-    "require": {}, 
-    "license": "MIT"
+  "name": "byjg/singleton-pattern",
+  "description": "A lightweight PHP implementation of the Design Pattern Singleton using trait.",
+  "authors": [
+    {
+      "name": "João Gilberto Magalhães",
+      "email": "joao@byjg.com.br"
+    }
+  ],
+  "autoload": {
+    "psr-4": {
+      "ByJG\\DesignPattern\\": "src/"
+    }
+  },
+  "require": {},
+  "require-dev": {
+    "phpunit/phpunit": ">5.7"
+  },
+  "license": "MIT"
 }

src/Singleton.php

@@ -11,7 +11,7 @@ protected function __construct()
     /**
      * @throws SingletonException
      */
-    final private function __clone()
+    final public function __clone()
     {
         throw new SingletonException('You can not clone a singleton.');
     }

tests/Sample1.php

@@ -0,0 +1,15 @@
+<?php
+
+require_once __DIR__ . "/../vendor/autoload.php";
+
+class Sample1
+{
+    use \ByJG\DesignPattern\Singleton;
+
+    public $property;
+
+    private function __construct()
+    {
+        $this->property = 10;
+    }
+}

tests/Sample2.php

@@ -0,0 +1,10 @@
+<?php
+
+require_once __DIR__ . "/../vendor/autoload.php";
+
+class Sample2
+{
+    use \ByJG\DesignPattern\Singleton;
+
+    public $property2;
+}

tests/SingletonTest.php

@@ -0,0 +1,48 @@
+<?php
+
+require_once __DIR__ . "/../vendor/autoload.php";
+require_once "Sample1.php";
+require_once "Sample2.php";
+
+class SingletonTest extends \PHPUnit\Framework\TestCase
+{
+    public function testSingleton()
+    {
+        $sample1 = Sample1::getInstance();
+        $this->assertEquals(10, $sample1->property);
+        $sample1->property = 20;
+        $this->assertEquals(20, $sample1->property);
+
+        $sample1Other = Sample1::getInstance();
+        $this->assertEquals(20, $sample1Other->property);
+        $sample1->property = 40;
+        $this->assertEquals(40, $sample1Other->property);
+        $this->assertEquals(40, $sample1->property);
+
+        //
+
+        $sample2 = Sample2::getInstance();
+        $sample2->property2 = 50;
+        $this->assertEquals(50, $sample2->property2);
+
+        $sample2Other = Sample2::getInstance();
+        $this->assertEquals(50, $sample2Other->property2);
+        $sample2->property2 = 90;
+        $this->assertEquals(90, $sample2Other->property2);
+        $this->assertEquals(90, $sample2->property2);
+
+        //
+
+        $this->assertEquals(40, $sample1->property);
+    }
+
+    /**
+     * @expectedException \ByJG\DesignPattern\SingletonException
+     */
+    public function testClone()
+    {
+        $sample1 = Sample1::getInstance();
+        $sample2 = clone $sample1;
+    }
+
+}