test concat spoofing=true PASSED!
test concat spoofing=false PASSED!
test pop spoofing=true PASSED!
test pop spoofing=false PASSED!
test reverse spoofing=true PASSED!
test reverse spoofing=false PASSED!
test shift spoofing=true PASSED!
test shift spoofing=false PASSED!
test splice spoofing=true PASSED!
test splice spoofing=false PASSED!
