nixosTests.mate: Add trivial tests for MATE 1.28 changes

Changed files
+9
nixos
tests
+9
nixos/tests/mate.nix
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machine.wait_for_text('(Applications|Places|System)')
machine.wait_for_text('(Computer|Home|Trash)')
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with subtest("Check if various environment variables are set"):
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machine.succeed("xargs --null --max-args=1 echo < /proc/$(pgrep -xf marco)/environ | grep 'XDG_CURRENT_DESKTOP' | grep 'MATE'")
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# From mate-panel-with-applets packaging
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machine.succeed("xargs --null --max-args=1 echo < /proc/$(pgrep -xf mate-panel)/environ | grep 'MATE_PANEL_APPLETS_DIR' | grep '${pkgs.mate.mate-panel-with-applets.pname}'")
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with subtest("Check if applets are built with in-process support"):
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# This is needed for Wayland support
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machine.fail("pgrep -fa clock-applet")
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with subtest("Lock the screen"):
machine.wait_until_succeeds("su - ${user.name} -c '${env} mate-screensaver-command -q' | grep 'The screensaver is inactive'")
machine.succeed("su - ${user.name} -c '${env} mate-screensaver-command -l >&2 &'")