add test for previous patch

verify that virtualenvwrapper_show_workon_options does not include blank
lines in its output

Change-Id: I630f94b8462c1f55cfad339f42c564d5fe65aae3

Author: dhellmann

tests/test_ls.sh

@@ -92,5 +92,11 @@ test_lsvirtualenv_space_in_env_name () {
     assertTrue "Did not see expected message in \"$output\"" "cat \"$WORKON_HOME/output\" | grep -q ' env with space'"
 }
 
+test_lsvirtualenv_blank_lines () {
+    # There should be no blank lines in the list of virtualenvs
+    mkvirtualenv "at-least-one-env" >/dev/null 2>&1
+    assertFalse "Found blank line in virtualenvwrapper_show_workon_options output" "virtualenvwrapper_show_workon_options | grep -q '^$'"
+}
+
 
 . "$test_dir/shunit2"