Rewrite tests for BaseUrlTester class
Rewrite tests for BaseUrlTester class

The new test case class uses new methods for preparing tests:
* setUp
* tearDown
* _setResolverGetRedirectUrlsResult

Set up for each test is performed in test method: there aren't any test-case specific
implementations of mocks anymore. There are new test methods, and parametrization
is being employed during testing.

The changes prepare the tests for refactoring of BaseUrlTester class.

piotr-rusin/spam-lists