public function testAddGetUsage()
 {
     $parserOutput = new ParserOutput();
     $acc = new ParserOutputUsageAccumulator($parserOutput);
     $tester = new UsageAccumulatorContractTester($acc);
     $tester->testAddGetUsage();
     $this->assertNotNull($parserOutput->getExtensionData('wikibase-entity-usage'));
 }
 public function testAddGetUsage()
 {
     $acc = new HashUsageAccumulator();
     $tester = new UsageAccumulatorContractTester($acc);
     $tester->testAddGetUsage();
 }