diff --git a/metamorpov-test.js b/metamorpov-test.js
index 7aa4b30..e4e2d93 100755
--- a/metamorpov-test.js
+++ b/metamorpov-test.js
@@ -57,6 +57,9 @@ const options = {
   }
 }
 
+/* Invalid input */
+metamorpov.translate({}, options.firstPerson);
+
 /* vrb, vrn */
 assert.equal(metamorpov.translate("vrb/be/", options.firstPerson), "was");               // I was
 assert.equal(metamorpov.translate("vrb/be/", options.secondPerson), "were");             // You were
@@ -208,5 +211,3 @@ assert.equal(metamorpov.translate("a/an pear", options.firstPerson), "a pear");
 assert.equal(metamorpov.translate("a/an apple", options.firstPerson), "an apple");         // Starts with a vowel sound
 assert.equal(metamorpov.translate("a/an hour", options.firstPerson), "an hour");           // Starts with a vowel sound despite consonant letter
 assert.equal(metamorpov.translate("a/an 1800s-era", options.firstPerson), "an 1800s-era"); // "Eighteen-hundreds" starts with a vowel sound
-
-console.log("Test succeeded");