TestUniformSplitPostingFormat.testCheckIntegrityReadsAllBytes test failure [LUCENE-9607]

CI builds have been failing with this:
```
FAILED:  org.apache.lucene.codecs.uniformsplit.TestUniformSplitPostingFormat.testCheckIntegrityReadsAllBytes

Error Message:
java.lang.AssertionError

Stack Trace:
java.lang.AssertionError
        at __randomizedtesting.SeedInfo.seed([43D1E1D1DB325AD7:3E13F00D7ACC8E7E]:0)
        at org.junit.Assert.fail(Assert.java:86)
        at org.junit.Assert.assertTrue(Assert.java:41)
        at org.junit.Assert.assertTrue(Assert.java:52)
        at org.apache.lucene.codecs.uniformsplit.TestUniformSplitPostingFormat.checkEncodingCalled(TestUniformSplitPostingFormat.java:63)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:564)
        at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1754)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:1000)
        at org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:49)
        at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
        at org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:48)
        at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
        at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
        at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:370)
        at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:819)
        at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:470)
        at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:951)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:836)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:887)
        at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:898)
        at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
        at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:41)
        at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
        at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
        at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at org.apache.lucene.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
        at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
        at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
        at org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:54)
        at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
        at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:370)
        at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:826)
        at java.base/java.lang.Thread.run(Thread.java:832)

Reproduce with: gradlew :lucene:codecs:test --tests "org.apache.lucene.codecs.uniformsplit.TestUniformSplitPostingFormat" -Ptests.jvms=6 -Ptests.haltonfailure=false -Ptests.jvmargs=-XX:+UseCompressedOops -XX:+UseSerialGC -Ptests.seed=43D1E1D1DB325AD7 -Ptests.multiplier=3 -Ptests.badapples=false -Ptests.file.encoding=US-ASCII
```
But it does not seem to repro for me on one try.

Also disturbing is the missing quotes around the `-Ptests.jvmargs=..` which then confuse `gradle` ... I'll open a separate issue for that.

---
Migrated from [LUCENE-9607](https://issues.apache.org/jira/browse/LUCENE-9607) by Michael McCandless (@mikemccand), updated Nov 14 2020

Start with org.apache.lucene.codecs.uniformsplit.TestUniformSplitPostingFormat, especially testCheckIntegrityReadsAllBytes and checkEncodingCalled at line 63. Run the provided Gradle command with its seed, then investigate why the assertion fails intermittently; done means the test no longer fails in CI and the reported integrity check behavior is covered reliably.

Written by the indexing model from the issue text.