Add DropSchemaSqlCollectorTest

tests/Doctrine/Tests/DBAL/Schema/Visitor/DropSchemaSqlCollectorTest.php

+<?php
+
+namespace Doctrine\Tests\DBAL\Schema\Visitor;
+
+use \Doctrine\DBAL\Schema\Visitor\DropSchemaSqlCollector;
+
+class DropSchemaSqlCollectorTest extends \PHPUnit_Framework_TestCase
+{
+    public function testGetQueriesUsesAcceptedForeignKeys()
+    {
+        $tableOne = $this->getMockWithoutArguments('Doctrine\DBAL\Schema\Table');
+        $tableTwo = $this->getMockWithoutArguments('Doctrine\DBAL\Schema\Table');
+
+        $keyConstraintOne = $this->getStubKeyConstraint('first');
+        $keyConstraintTwo = $this->getStubKeyConstraint('second');
+
+        $platform = $this->getMockBuilder( 'Doctrine\DBAL\Platforms\AbstractPlatform')
+			->setMethods(array('getDropForeignKeySQL'))
+			->getMockForAbstractClass();
+
+        $collector = new DropSchemaSqlCollector($platform);
+
+        $platform->expects($this->exactly(2))
+            ->method('getDropForeignKeySQL');
+
+        $platform->expects($this->at(0))
+            ->method('getDropForeignKeySQL')
+            ->with($keyConstraintOne, $tableOne);
+
+        $platform->expects($this->at(1))
+            ->method('getDropForeignKeySQL')
+            ->with($keyConstraintTwo, $tableTwo);
+
+        $collector->acceptForeignKey($tableOne, $keyConstraintOne);
+        $collector->acceptForeignKey($tableTwo, $keyConstraintTwo);
+
+        $collector->getQueries();
+    }
+
+    private function getMockWithoutArguments($className)
+    {
+        return $this->getMockBuilder($className)->disableOriginalConstructor()->getMock();
+    }
+
+    private function getStubKeyConstraint($name)
+    {
+        $constraint = $this->getMockWithoutArguments('Doctrine\DBAL\Schema\ForeignKeyConstraint');
+
+        $constraint->expects($this->any())
+            ->method('getName')
+            ->will($this->returnValue($name));
+
+        return $constraint;
+    }
+}