updated test script

Author: Dipak Sarkar

tests/unit/directive.spec.js

@@ -1,5 +1,5 @@
 import directive from '../../src/directive'
 
 test ('should not throw error on empty config', () => {
-  expect(() => directive({}, {})).toThrow()
+  expect(() => directive({}, {})).not.toThrow()
 })