The testsuite/integration/elytron pom has a profile that disables running an execute-commands execution to configure the server if property skipTests is set. That means it doesn't run with -DskipTests=false or -DskipTests=${SOME_UNSET_ENV_VAR}. For the latter case the default behavior if the prop is unset should be the same as 'false'.

The profile should only be enabled if the value is "true". And it turns out that somehow just using -DskipTests results in the same behavior as -DskipTests=true.