Github user gaborgsomogyi commented on a diff in the pull request: https://github.com/apache/spark/pull/21450#discussion_r192386271 --- Diff: launcher/src/test/java/org/apache/spark/launcher/SparkSubmitCommandBuilderSuite.java --- @@ -190,6 +194,23 @@ public void testSparkRShell() throws Exception { env.get("SPARKR_SUBMIT_ARGS")); } + @Test + public void testExamplesRunnerNoArg() throws Exception { --- End diff -- Now it prints out the usage.
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