Test migration to jest by hand

Apparently using regular expressions is way easier.

test/observeMutations/observeMutations.js

@@ -0,0 +1,19 @@
+const observeMutations = (element, callback, options) => {
+const observer = new MutationObserver(mutations => mutations.forEach(m => callback(m)));
+observer.observe(
+element,
+Object.assign(
+{
+childList: true,
+attributes: true,
+attributeOldValue: true,
+characterData: true,
+characterDataOldValue: true,
+subtree: true
+},
+options
+)
+);
+return observer;
+};
+module.exports = observeMutations;