Launchpad Testing WAR tests fail due to a CNFE

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T E S T S
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Running org.apache.sling.launchpad.testing.TestAll
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.579
sec <<< FAILURE!
initializationError(org.apache.sling.launchpad.testing.TestAll) Time
elapsed: 0.007 sec <<< ERROR!
java.lang.NoClassDefFoundError:
org/apache/sling/commons/testing/integration/HttpTest
at java.lang.ClassLoader.defineClass1(Native Method)