fixing class aliasing

Author: mathiasgrimm

.gitignore

@@ -10,4 +10,4 @@
 .buildpath
 test/log
 vendor/
-.idea
+.idea

phpunit.xml

@@ -3,7 +3,7 @@
 <phpunit bootstrap="test/bootstrap.php" colors="true">
     <testsuites>
         <testsuite name="Project Test Suite">
-            <directory>src/</directory>
+            <directory>test/src/</directory>
         </testsuite>
     </testsuites>
 
@@ -17,7 +17,7 @@
 
         <log 
             type           = "coverage-html" 
-            target         = "./log/html" 
+            target         = "test/log/html"
             charset        = "UTF-8"
             yui            = "true" 
             hightlight     = "true" 

src/ArrayPath.php

@@ -172,10 +172,18 @@ public static function exists($aSource, $mIndex)
      *
      * You can define your own alias if you want
      *
+     * If a given class alias already exists it will not be registered
+     *
+     *
      * @param string $alias
+     * @return boolean
      */
     public static function registerClassAlias($alias = 'A')
     {
-        class_alias('\MathiasGrimm\ArrayPath\ArrayPath', $alias);
+        if (!class_exists($alias)) {
+            return class_alias('\MathiasGrimm\ArrayPath\ArrayPath', $alias);
+        }
+
+        return false;
     }
 }

test/src/ArrayPathTest.php

@@ -217,4 +217,9 @@ public function testItRegisterClassAliasWithAlias()
         $this->assertTrue(MyAlias::exists($a, 'a/b/c'));
     }
 
+    public function testItRegisterAliasOnlyOnce()
+    {
+        $this->assertTrue(ArrayPath::registerClassAlias('AP'));
+        $this->assertFalse(ArrayPath::registerClassAlias('AP'));
+    }
 }