Test argecho and fix shellcheck issue

Author: blueyed

example/Makefile

@@ -15,5 +15,17 @@ test: test-setup
 	for vim in $$vims; do \
 	  $(DOCKER) $$vim '+Vader! test/*'; \
 	done
+	out=$$(docker run --rm "$(IMAGE)" /vim-build/bin/argecho "arg1" "arg 2"); \
+	for line in "PWD=/" "Running as: root" "Arguments:" "arg1" "arg 2"; do \
+	  if ! echo "$$out" | grep -qFx -e "$$line"; then \
+	    echo "Line not found: $$line"; echo "$$out"; exit 1; \
+	  fi \
+	done
+	out=$$(docker run --rm "$(IMAGE)" argecho "arg1" "arg 2"); \
+	for line in "Running as: vimtest" "PWD=/testplugin" "Arguments:" "-u" "/home/vimrc" "-i" "NONE" "arg1" "arg 2"; do \
+	  if ! echo "$$out" | grep -qFx -e "$$line"; then \
+	    echo "Line not found: $$line"; echo "$$out"; exit 1; \
+	  fi \
+	done
 
 .PHONY: test-setup test

scripts/argecho.sh

@@ -9,6 +9,6 @@ env
 echo
 echo "Arguments:"
 while [ $# -gt 0 ]; do
-  echo $1
+  echo "$1"
   shift
 done