Add some helper functions in BW_UnitTestCase

[bobbingwide]

During development of new test cases for the oik base plugin, as part of the i18n work, I developed some helper functions that allow the generated HTML to be treated as an array and for hardcoded or generated values to be replaced with generic values, or vice-versa.

This makes it slightly easier to construct the $expected output for assertions. These new methods could be generalised and implemented in oik-batch'es BW_UnitTestCase class.

New method	Purpose
replace_admin_url	replaces instances of admin_url() in $expected
replace_oik_url	replaces instances of oik_url() in generated HTML
tag_break	Inserts new line between tags then converts into an array
generated_expected	Help to generate the expected array from actual test output
replace_nonse_with_nonsense	Generalises WordPress generated hidden input nonce fields
replace_between	Generalised string replace between before and after strings
replace_antispambot	Replace randomised antispambot'd mailto links with known value

[bobbingwide]

I developed more functions to support tests using different locales ( especially bb_BB ). These should also be added to the BW_UnitTestCase class.

New method	Purpose
assertArrayEqualsFile	Asserts that the HTML array equals the file
prepareExpectedArray	Converts to an array if required
prepareFile	Returns the expected file name
find_test_name	Finds the test name from the call stack
query_la_CY	Queries the currently set locale
generate_expected_file	Helps to generate the expected file from actual test output

[bobbingwide]

More methods to be added

New method	Purpose
switch_to_locale	Switch to a selected locale and reload domains
reload_domains	reload domains and enable Just Translate It

[bobbingwide]

More methods added

New method	Purpose
replace_created_nonce	Replaces the created nonce with nonsense
arraytohtml	Reduce a print_r'ed string

[bobbingwide]

More methods to be added

New method	Purpose
replace_home_url	replaces instances of home_url() and site_url() in $expected
replace_post_id	replaces instances of "post=" . $post->ID with "post=42"

replace_post_id supports a $prefix parameter so you can use other this method to replace the post->ID in other parameter names e.g. 'id="link-'