public function testGetFields()
 {
     $mainTable = 'main_table';
     $expectedDescribedTable = ['described_table' => null];
     $this->resource->expects($this->any())->method('getMainTable')->willReturn($mainTable);
     $this->connection->expects($this->once())->method('describeTable')->with($mainTable)->willReturn($expectedDescribedTable);
     $this->assertEquals($expectedDescribedTable, $this->entityMetadata->getFields($this->model));
     //get from cached
     $this->connection->expects($this->never())->method('describeTable');
     $this->assertEquals($expectedDescribedTable, $this->entityMetadata->getFields($this->model));
 }