Fix random unit test failure with Google Storage

We see various unit test failures with Google Storage (https://jenkins.platform.dev.nuxeo.com/job/nuxeo/job/lts/job/nuxeo/job/PR-1737/2/testReport/)

• org.nuxeo.ecm.core.storage.gcp.TestGoogleStorageBlobScroll.testBlobScroll

  java.lang.AssertionError
  	at org.junit.Assert.fail(Assert.java:87)
  	at org.junit.Assert.assertTrue(Assert.java:42)
  	at org.junit.Assert.assertTrue(Assert.java:53)
  	at org.nuxeo.ecm.core.blob.AbstractTestBlobScroll.testBlobScroll(AbstractTestBlobScroll.java:99)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
  	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
  	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
  	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeMethodRunStatement.evaluate(FeaturesRunner.java:457)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeSetupStatement.evaluate(FeaturesRunner.java:471)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner.evaluateRunnable(FeaturesRunner.java:328)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$AfterMethodRunStatement.evaluate(FeaturesRunner.java:493)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner.evaluateRunnable(FeaturesRunner.java:328)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$AfterTeardownStatement.evaluate(FeaturesRunner.java:506)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$RulesFactory$1.evaluate(FeaturesRunner.java:576)
  	at org.nuxeo.runtime.test.runner.RuntimeDeployment$DeploymentStatement.evaluate(RuntimeDeployment.java:293)
  	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
  	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
  	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
  	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
  	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
  	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
  	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
  	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
  	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$AfterClassStatement.evaluate(FeaturesRunner.java:404)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$RulesFactory$1.evaluate(FeaturesRunner.java:576)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeClassStatement.evaluate(FeaturesRunner.java:387)
  	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
  	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
  	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
  	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
  	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
  	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
  

• org.nuxeo.ecm.core.storage.gcp.TestGoogleStorageBlobStore.testGC

  java.lang.AssertionError: expected:<1> but was:<0>
  	at org.junit.Assert.fail(Assert.java:89)
  	at org.junit.Assert.failNotEquals(Assert.java:835)
  	at org.junit.Assert.assertEquals(Assert.java:647)
  	at org.junit.Assert.assertEquals(Assert.java:633)
  	at org.nuxeo.ecm.core.blob.TestAbstractBlobStore.testGC(TestAbstractBlobStore.java:502)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  	at java.base/java.lang.reflect.Method.invoke(Method.java:568)
  	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
  	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
  	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeMethodRunStatement.evaluate(FeaturesRunner.java:457)
  	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeSetupStatement.evaluate(FeaturesRunner.java:471)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner.evaluateRunnable(FeaturesRunner.java:328)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$AfterMethodRunStatement.evaluate(FeaturesRunner.java:493)
  	at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner.evaluateRunnable(FeaturesRunner.java:328)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$AfterTeardownStatement.evaluate(FeaturesRunner.java:506)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$RulesFactory$1.evaluate(FeaturesRunner.java:576)
  	at org.nuxeo.runtime.test.runner.RuntimeDeployment$DeploymentStatement.evaluate(RuntimeDeployment.java:293)
  	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
  	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
  	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
  	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
  	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
  	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
  	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
  	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
  	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$AfterClassStatement.evaluate(FeaturesRunner.java:404)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$RulesFactory$1.evaluate(FeaturesRunner.java:576)
  	at org.nuxeo.runtime.test.runner.FeaturesRunner$BeforeClassStatement.evaluate(FeaturesRunner.java:387)
  	at org.junit.rules.RunRules.evaluate(RunRules.java:20)
  	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
  	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:365)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.executeWithRerun(JUnit4Provider.java:273)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:238)
  	at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:159)
  	at org.apache.maven.surefire.booter.ForkedBooter.invokeProviderInSameClassLoader(ForkedBooter.java:384)
  	at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:345)
  	at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:126)
  	at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:418)
  

• etc.

It may be caused by google Storage having some lags (compared to other providers such as Azure, S3, etc.) when creating blob objects. They might not be listable as quick as expected.

To be investigated...