unset global QUIET/VERBOSE/DEBUG variables when running tests

Author: neko-kai

test/setup

@@ -8,6 +8,11 @@ set -e
 # Set the GIT_SUBREPO_ROOT for testing.
 source "$PWD"/.rc
 
+# Unset variables that can change command output for testing
+unset GIT_SUBREPO_QUIET
+unset GIT_SUBREPO_VERBOSE
+unset GIT_SUBREPO_DEBUG
+
 # Get the location of this script
 SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )