[OptionsResolver] fix allowed values with null

Author: Tobion

OptionsResolver.php

@@ -484,7 +484,7 @@ public function setAllowedValues($option, $allowedValues = null)
             ));
         }
 
-        $this->allowedValues[$option] = $allowedValues instanceof \Closure ? array($allowedValues) : (array) $allowedValues;
+        $this->allowedValues[$option] = is_array($allowedValues) ? $allowedValues : array($allowedValues);
 
         // Make sure the option is processed
         unset($this->resolved[$option]);
@@ -538,12 +538,14 @@ public function addAllowedValues($option, $allowedValues = null)
             ));
         }
 
-        if ($allowedValues instanceof \Closure) {
-            $this->allowedValues[$option][] = $allowedValues;
-        } elseif (!isset($this->allowedValues[$option])) {
-            $this->allowedValues[$option] = (array) $allowedValues;
+        if (!is_array($allowedValues)) {
+            $allowedValues = array($allowedValues);
+        }
+
+        if (!isset($this->allowedValues[$option])) {
+            $this->allowedValues[$option] = $allowedValues;
         } else {
-            $this->allowedValues[$option] = array_merge($this->allowedValues[$option], (array) $allowedValues);
+            $this->allowedValues[$option] = array_merge($this->allowedValues[$option], $allowedValues);
         }
 
         // Make sure the option is processed

Tests/OptionsResolver2Dot6Test.php

@@ -724,6 +724,14 @@ public function testResolveSucceedsIfValidValue()
         $this->assertEquals(array('foo' => 'bar'), $this->resolver->resolve());
     }
 
+    public function testResolveSucceedsIfValidValueIsNull()
+    {
+        $this->resolver->setDefault('foo', null);
+        $this->resolver->setAllowedValues('foo', null);
+
+        $this->assertEquals(array('foo' => null), $this->resolver->resolve());
+    }
+
     /**
      * @expectedException \Symfony\Component\OptionsResolver\Exception\InvalidOptionsException
      * @expectedExceptionMessage The option "foo" with value 42 is invalid. Accepted values are: "bar", false, null.
@@ -847,6 +855,14 @@ public function testResolveSucceedsIfValidAddedValue()
         $this->assertEquals(array('foo' => 'bar'), $this->resolver->resolve());
     }
 
+    public function testResolveSucceedsIfValidAddedValueIsNull()
+    {
+        $this->resolver->setDefault('foo', null);
+        $this->resolver->addAllowedValues('foo', null);
+
+        $this->assertEquals(array('foo' => null), $this->resolver->resolve());
+    }
+
     /**
      * @expectedException \Symfony\Component\OptionsResolver\Exception\InvalidOptionsException
      */