spock.util.environment
@Inherited @Retention(value=RUNTIME) @Target(value={TYPE,METHOD}) public @interface RestoreSystemProperties
Applying this annotation to a spec class has the same effect as applying it to all its feature methods.
Note: Temporarily changing the values of system properties is only safe when specs are run in a single thread per JVM. Even though many execution environments do limit themselves to one thread per JVM, keep in mind that Spock cannot enforce this.