testing HostEnsureCanCompileStrings

[mikesamuel]

It's possible to test corner cases around HostEnsureCanCompileStrings from a browser or command line using tricks like those in tc39/ecma262 issue #1495:

<meta http-equiv="Content-Security-Policy" content="script-src 'nonce-test'">
<script nonce="test">
// Code to run with HostEnsureCanCompileStrings is false
</script>

or

$ npx node@10 --disallow_code_generation_from_strings -e '// Code to run'

Quite a few of these interactions could be tested if there was simply a way to get HostEnsureCanCompileStrings to throw for a particular testcase without breaking tests that assumes it returns normally like those under test/language/eval-code.

Even more interactions could be tested if it could be turned off only for particular values of calleeRealm.

[mikesamuel]

Apparently web-platform-tests provides an alternative for JS engines that are used in browsers.

[rwaldron]

The associated PR tc39/ecma262#1498 hasn't had author activity since June 2019. We can reopen here if there is anything that needs to be done in Test262