Update lib/effects.js

Author: DavertMik

lib/effects.js

@@ -49,7 +49,7 @@ async function hopeThat(callback) {
         result = false
         const msg = err.inspect ? err.inspect() : err.toString()
         debug(`Unsuccessful assertion > ${msg}`)
-        event.dispatcher.on(event.test.finished, test => {
+        event.dispatcher.once(event.test.finished, test => {
           test.notes.push({ type: 'conditionalError', text: msg })
         })
         recorder.session.restore(sessionName)