Refactored UrlManagerTest to cover more use cases

[cebe]

UrlManager is a complex class with a large bunch of options that needs
to be tested
and we had a few regressions in the past even though there are already a
lot of tests
covering it. Test coverage measured by lines does not help us determine
how good it is tested,
we need test coverage for every major path through the code.

I have refactored the UrlManager tests to reflect the different options
and cases to
have a better overview of which cases are covered and which are not.

UrlManager has two main operation modes:

• "default" url format, which is the simple case. These are covered by
  methods in UrlManagerTest.

• "pretty" url format. This is the complex case, which involves UrlRules
  and url parsing.
  I have created two separate classes for this case:
  Url creation for "pretty" url format is covered by
  UrlManagerCreateUrlTest.
  Url parsing for "pretty" url format is covered by
  UrlManagerParseUrlTest.

Each of the test classes have a getUrlManager method that creates a
UrlManager instance
with a specific configuration and certain variations in options.
It is also tested that options that are not relevant in a certain
operation mode have no effect on the result.

To make sure to not remove tests that have existed before, here is a map
of where code has been moved.
The following test methods existed in the old test
class:

• testCreateUrl() split between UrlManagerTest and
  UrlManagerCreateUrlTest variations should all be covered by
  variationsProvider().

• testCreateUrlWithNullParams() covered by UrlManagerCreateUrlTest by
  testWithNullParams()

• testCreateUrlWithEmptyPattern()

• testCreateAbsoluteUrl() covered in UrlManagerCreateUrlTest by new
  tests via variationsProvider().

• testCreateAbsoluteUrlWithSuffix() covered in UrlManagerCreateUrlTest
  by testAbsolutePatterns.

• testParseRequest() covered by UrlManagerParseUrlTest, UrlNormalizer
  related parts moved to UrlNormalizerTest.

• testParseRESTRequest() moved to UrlManagerParseUrlTest

• testHash() covered in different tests in UrlManagerCreateUrlTest.

• testMultipleHostsRules($host) kept as is.

Before:

$ vendor/bin/phpunit tests/framework/web/UrlManagerTest.php
...
OK (12 tests, 89 assertions)

After:

$ vendor/bin/phpunit tests/framework/web/UrlManager*.php
...
OK (72 tests, 648 assertions)