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In general, it is not possible in glibc (i.e., most Linux systems) to change environment variables after a program has launched, at least for multi-threaded programs. In earlier versions of Java it was possible to fake this at the Java runtime level by using reflection to access the Java hash map that mirrored the process's environment variables in the operating system, but recent versions of Java close off these reflection-based tricks. As such I am simply removing any tests that try to do this. I left the most important test with
@Ignorein case someone needs to run it manually specifying the needed environment variable.