Github user cestella commented on a diff in the pull request: https://github.com/apache/metron/pull/742#discussion_r137913498 --- Diff: metron-stellar/stellar-common/src/test/java/org/apache/metron/stellar/dsl/functions/StringFunctionsTest.java --- @@ -408,6 +408,23 @@ public void testAppendIfMissing() throws Exception { } + @Test + public void testSubstring() throws Exception { + Map<String, Object> variables = ImmutableMap.of("s", "apache metron"); --- End diff -- Agreed, we should expect an exception in that case.
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