jdk/jshell/ExternalEditorTest.java testStatementMush() fails frequently on all platform

----------System.out:(75/4082)----------
[TestNG] Running:
  jdk/jshell/ExternalEditorTest.java

config ExternalEditorTest.setUpExternalEditorTest(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testAccept(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testCancel(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testDoNothing(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testEditClass2(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testEditMethod2(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testEditNegative(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testEditVariable1(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testEditVariable2(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testNoArguments(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testStartup(): success
config ReplToolTesting.setUp(): success
test EditorTestBase.testStatementMush(): failure
java.lang.AssertionError: Expected empty output, got: Hello
 expected [true] but found [false]
at org.testng.Assert.fail(Assert.java:94)
at org.testng.Assert.failNotEquals(Assert.java:496)
at org.testng.Assert.assertTrue(Assert.java:42)
at ReplToolTesting.testRaw(ReplToolTesting.java:276)
at ReplToolTesting.test(ReplToolTesting.java:214)
at ReplToolTesting.test(ReplToolTesting.java:202)
at EditorTestBase.testEditor(EditorTestBase.java:49)
at ExternalEditorTest.testEditor(ExternalEditorTest.java:119)
at EditorTestBase.testEditor(EditorTestBase.java:45)
at EditorTestBase.testStatementMush(EditorTestBase.java:250)
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:537)
at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:124)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
at org.testng.TestRunner.privateRun(TestRunner.java:773)
at org.testng.TestRunner.run(TestRunner.java:623)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
at org.testng.SuiteRunner.run(SuiteRunner.java:259)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
at org.testng.TestNG.run(TestNG.java:1018)
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:220)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:537)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.base/java.lang.Thread.run(Thread.java:844)
config ReplToolTesting.setUp(): success
test ExternalEditorTest.setUnknownEditor(): success
config ExternalEditorTest.shutdown(): success

===============================================
jdk/jshell/ExternalEditorTest.java
Total tests run: 12, Failures: 1, Skips: 0
===============================================

----------System.err:(12/733)----------
java.lang.Exception: failures: 1
at com.sun.javatest.regtest.TestNGAction$TestNGRunner.main(TestNGAction.java:223)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:537)
at com.sun.javatest.regtest.agent.MainActionHelper$SameVMRunnable.run(MainActionHelper.java:226)
at java.base/java.lang.Thread.run(Thread.java:844)

JavaTest Message: Test threw exception: java.lang.Exception
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.Exception: failures: 1