public static Specification<PerfTest> idRegionEqual(final String region) {
		return (Specification<PerfTest>) (root, query, cb) -> cb.or(cb.equal(root.get("region"), region), cb.equal(root.get("region"), ""));
	}
Get the {@link Specification} checking if the {@link PerfTest} has the given region.

@param region region of perf test
@return {@link Specification}
@since 3.1
ngrinder-controller/src/main/java/org/ngrinder/perftest/repository/PerfTestSpecification.java