#3180. Add instanceof and instanceOfString tests

[sgrekhov]

I also tried to test the case where constructorName contains a . but wasn’t successful. @srujzs, do you know how to import a JS class from a library into the tests? Any advice is appreciated. I tried the approach below, but it doesn’t work (module.js contains definitions for classes A and B).

// OtherResources=module.js
import 'dart:async';
import 'dart:js_interop';
import 'dart:js_interop_unsafe';
import '../../../Utils/expect.dart';
import '../js_utils.dart';

final completer = Completer<String>();

void complete(String value) {
  completer.complete(value);
}

main() async {
  globalContext["complete"] = complete.toJS;
  eval(r'''
    (async () => { 
      const lib1 = await import('./module.js');
      globalThis.objA = new lib1.A(42, "A form JS");
      globalThis.objB = new lib1.B();
    })().then(function(v) {
      globalThis.complete("");
    });
  ''');
  asyncStart();
  completer.future.then((_) {
    Expect.isTrue(globalContext["objA"].instanceOfString("lib1.A"));
    asyncEnd();
  });
}

[srujzs]

I'm not quite sure how OtherResources works but in the past I've checked in a JS file and used the /root_test/ prefix to reference other files: https://github.com/dart-lang/sdk/blob/db0c6461570c3e1696ded7095f9a2ab8d181403b/tests/lib/js/static_interop_test/import/import_test.dart#L17.

It's possible that the compiled file isn't in the same directory as the test files so a relative path may not work.

[sgrekhov]

Updated. Added tests for constructorName with . (using /root_dart/...). Please take another look.

[sgrekhov]

Updated. PTAL.