public function testFormatCatalogue()
    {
        $catalogue = new MessageCatalogue('en');
        $catalogue->add(array('foo' => 'bar', 'bar' => 'foo
foo', 'foo;foo' => 'bar'));
        $dumper = new CsvFileDumper();
        $this->assertStringEqualsFile(__DIR__ . '/../fixtures/valid.csv', $dumper->formatCatalogue($catalogue, 'messages'));
    }