Fixed some shellcheck warnings

test/run

@@ -5,7 +5,9 @@ bats_executable="${test_directory}/../test_lib/bats-core/bin/bats"
 git submodule init && git submodule update
 
 if [ -z "${BASH_IT}" ]; then
-  export BASH_IT=$(cd ${test_directory} && dirname $(pwd))
+  declare BASH_IT
+  BASH_IT=$(cd ${test_directory} && dirname "$(pwd)")
+  export BASH_IT
 fi
 
 exec $bats_executable ${CI:+--tap} ${test_directory}/{bash_it,completion,install,lib,plugins,themes}