generate new test that did already exist & update all module snippets with declaration

test/initialize2DArray/initialize2DArray.js

@@ -1,4 +1,4 @@
-module.exports = (w, h, val = null) =>
+module.exports = initialize2DArray = (w, h, val = null) =>
 Array(h)
 .fill()
 .map(() => Array(w).fill(val));