(bash) test on behaviour of sourcing

bash-test.sh

@@ -1,7 +1,10 @@
 #!/usr/bin/env bash
 
-if ! $(which $1 &>/dev/null); then
+if ! $(which navig &>/dev/null); then
     echo "command not found"
-else
-    echo "$1 exists"
+    return 1
 fi
+
+function bash_source_test_function {
+    echo "sourcing not interrupted"
+}