Functions tests would benefit from a helper like verifyNoRestrictedFunctionProperties

[gibson042]

Originally posted by @gibson042 in #4355 (comment)

I think we should modernize [test/built-ins/Function/StrictFunction_restricted-properties.js] as well, introducing a helper like verifyNoRestrictedFunctionProperties and using it at e.g.

• test/language/expressions/{arrow-function,async-arrow-function,async-function,async-generator,class,function,generators}/{restricted-properties,restricted-properties-module}.js (covering expressions like var f = function(){}; and generalizations, in script and module code)
• test/language/statements/{async-function,async-generator,class,function,generators}/restricted-properties.js (covering statements like function f(){} and generalizations, in script and module code)
• test/language/statements/class/definition/{methods-restricted-properties,methods-restricted-properties-module}.js (covering methods like var m = new (class { m(){} })().m, in script and module code)
  • likewise somewhere for generalizations—class static methods, object literal methods, and syntactic get/set accessors
• test/built-ins/{AsyncFunction,AsyncGeneratorFunction,Function,GeneratorFunction}/instance-restricted-properties.js (each covering both $Function() and $Function('"use strict"'), or alternatively split into a pair of files)
• test/built-ins/Function/prototype/bind/instance-restricted-properties.js

and removing all other restricted-properties files.