Declare Collection methods alphabetically by visibility

We can move this to a separate, pedantic test class later.

tests/CollectionTest.php

@@ -6,7 +6,7 @@ use MongoDB\Driver\Manager;
 class CollectionTest extends PHPUnit_Framework_TestCase {
 
     function setUp() {
-        require __DIR__ . "/" . "utils.inc";
+        require_once __DIR__ . "/" . "utils.inc";
         $this->faker = Faker\Factory::create();
         $this->faker->seed(1234);
 
@@ -44,5 +44,28 @@ class CollectionTest extends PHPUnit_Framework_TestCase {
         }
         $this->assertEquals(0, $n);
     }
+
+    public function testMethodOrder()
+    {
+        $class = new ReflectionClass('MongoDB\Collection');
+
+        $filters = array(
+            'public' => ReflectionMethod::IS_PUBLIC,
+            'protected' => ReflectionMethod::IS_PROTECTED,
+            'private' => ReflectionMethod::IS_PRIVATE,
+        );
+
+        foreach ($filters as $visibility => $filter) {
+            $methods = array_map(
+                function(ReflectionMethod $method) { return $method->getName(); },
+                $class->getMethods($filter)
+            );
+
+            $sortedMethods = $methods;
+            sort($sortedMethods);
+
+            $this->assertEquals($methods, $sortedMethods, sprintf('%s methods are declared alphabetically', ucfirst($visibility)));
+        }
+    }
 }