public function testGetComposerJsonFiles()
{
$configPath = 'app/code/Test/Module/composer.json';
$modulesDirectoryMock = $this->getMock('Magento\\Framework\\Filesystem\\Directory\\ReadInterface');
$modulesDirectoryMock->expects($this->any())->method('getRelativePath')->will($this->returnArgument(0));
$modulesDirectoryMock->expects($this->any())->method('isExist')->with($configPath)->will($this->returnValue(true));
$this->directoryReadFactoryMock->expects($this->any())->method('create')->will($this->returnValue($modulesDirectoryMock));
$this->_moduleListMock->expects($this->once())->method('getNames')->will($this->returnValue(['Test_Module']));
$model = new \Magento\Framework\Module\Dir\Reader($this->_dirsMock, $this->_moduleListMock, new FileIteratorFactory(new \Magento\Framework\Filesystem\File\ReadFactory(new \Magento\Framework\Filesystem\DriverPool())), $this->directoryReadFactoryMock);
$model->setModuleDir('Test_Module', '', 'app/code/Test/Module');
$this->assertEquals($configPath, $model->getComposerJsonFiles()->key());
}
