We resolve the problem by declaring the test function in an external test package, that is, in a file in the net/url directory whose package declaration reads package url_test. The extra suffix _test is a signal to go test that it should build an additional package containing just these files and run its tests. It may be helpful to think of this external test package as if it had the import path net/url_test, but it cannot be imported under this or any other name. Because external tests live in a separate package, they may import helper packages that also depend on the package being tested; an
...more
