FunctionTest: Fix some test failure checks

Frank Danarequested to merge
ferdnyc/cmake:functiontests-haz-fails into master

This corrects a long-standing (14 years!) issue with two of the tests in Tests/FunctionTest/CMakeLists.txt, by adding failure conditions. Previously the tests would always issue a pass() result, regardless of actual success or failure.

Fixes: #23584 (closed)

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