Fix error with tests

tests/helpers.sh

@@ -4,8 +4,8 @@ FAIL="false"
 
 set_tmux_conf_helper() {
 	> ~/.tmux.conf	# empty filename
-	while read -r line; do
-		echo $line >> ~/.tmux.conf
+	while read line; do
+		echo "$line" >> ~/.tmux.conf
 	done
 }
 

tests/test_plugin_installation.sh

@@ -24,7 +24,7 @@ test_plugin_installation() {
 test_multiple_plugins_installation() {
 	set_tmux_conf_helper <<- HERE
 	set -g @plugin "tmux-plugins/tmux-example-plugin"
-	  set  -g    @plugin 'tmux-plugins/tmux-copycat'
+	\ \ set  -g    @plugin 'tmux-plugins/tmux-copycat'
 	run-shell "$PWD/tpm"
 	HERE