public function testSaveFalse()
 {
     $usageMock = $this->getMockBuilder('OCA\\ocUsageCharts\\Entity\\Storage\\StorageUsage')->disableOriginalConstructor()->getMock();
     $this->repository->expects($this->once())->method('save')->willReturn(false);
     $result = $this->abstractProvider->save($usageMock);
     $this->assertFalse($result);
 }