anchor.diff:            "foo/": "%$scheme/notthere/foo/",
             "foo/bar": "%$scheme/notthere/foo/bar",
             "foo.x": null,
  +          "bar/bar": "%$scheme/notthere/bar/bar",
           });
       }
   
  
positive.code:   Uri res1 = await Isolate.resolvePackageUri(Uri.parse("package:foo"));
    Uri res2 = await Isolate.resolvePackageUri(Uri.parse("package:foo/"));
    Uri res3 = await Isolate.resolvePackageUri(Uri.parse("package:foo/bar"));
    String fooX = await foo
      .loadLibrary()
      .timeout(const Duration(seconds: 1))
  
negative.code:     "foo/": res2?.toString(),
      "foo/bar": res3?.toString(),
      "foo.x": fooX?.toString(),
      "bar/bar": res4?.toString(),
      "relative": res5?.toString(),
      "nonpkg": res6?.toString(),
    }));
  }
  """;
  