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TEST: luarocks config --system-config shows the path of the system config

MKDIR: %{testing_lrprefix}/etc/luarocks

FILE: %{testing_lrprefix}/etc/luarocks/config-%{LUA_VERSION}.lua
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RUN: luarocks config --system-config

STDOUT:
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%{path(%{testing_lrprefix}/etc/luarocks/config-%{LUA_VERSION}.lua)}
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