Feedback when switching versions

Author: Greg Bowler

Diff for: switch-phpunit-version

@@ -1,10 +1,21 @@
 #!/bin/bash
+set -e
+
 if [ "$1" = "latest" ]
 then
 	version=9
 else
 	version=$1
 fi
 
-rm -f /usr/local/bin/phpunit
-ln -s "/usr/local/bin/phpunit-$version" "/usr/local/bin/phpunit"
+phpunit_bin="/usr/local/bin/phpunit-$version"
+
+if test -f $phpunit_bin
+then
+	rm -f /usr/local/bin/phpunit
+	ln -s "$phpunit_bin" "/usr/local/bin/phpunit"
+	echo "Successfully linked $phpunit_bin"
+else
+	echo "Error linking $phpunit_bin: version doesn't exit"
+	exit 1
+fi