Add testing of delayed writes to the remote API

Added more testing to ensure correct handling of delayed writes

refactor: handle default options w/ other optgroups

fix: ensure that there is only 1 selected option

Multiple selected option would not be valid HTML.

Add test for optgroup support in selects

use waitForTick in all our tests

refactored the remote API tests

Now each command is checked within it's own test on a completely clean
install. Hopefuly this also takes care of the flaky test behavior seen
at Travis occasionally.

new helper method waitForTick() in DokuWikiTest

Some of our tests require that at least one second has passed before
they can continue because our revisions depend on the Unix Timestamp.

Currently

new helper method waitForTick() in DokuWikiTest

Some of our tests require that at least one second has passed before
they can continue because our revisions depend on the Unix Timestamp.

Currently we use a sleep(1) for this. However this always waits a whole
second, even if the next second is already much closer or maybe already
here - especially when some processing has been done since the last
operation.

This new method waits for the next second by checking the time every
10th of a second. This might speed up some of our tests a bit.

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do not static cache useheading during tests

This took me way to long to figure out. The useheading setting was
cached in a static variable which is fine usually as it doesn't change
during a single

do not static cache useheading during tests

This took me way to long to figure out. The useheading setting was
cached in a static variable which is fine usually as it doesn't change
during a single request. But in testing we want to change it often.

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fix problems with header that look falsy. fixes #1770

fix test test_deletedimage

add deleted media test

fix tests for newer PHPUnit. fixes #1643

getMock is deprecated in new PHPUnit versions and createMock is the
recommended replacement. However that one is not available in older
PHPUnit releases. Sin

fix tests for newer PHPUnit. fixes #1643

getMock is deprecated in new PHPUnit versions and createMock is the
recommended replacement. However that one is not available in older
PHPUnit releases. Since we still support older PHP releases we have to
support older PHPUnit releases as well.

This add some compatibility functions to our TestCase class and replaces
all calls to getMock. Tested with PHPUnit 4.6.6 and 5.5.0.

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filesize_h might not be used in HTML content only #1622

Using an HTML entitiy might be problematic in non HTML renderers or when
the output is escaped again.

Fixed broken links to php.net and redirecting pages to php.net

try to fix flaky test by clearing the statcache

run HTTP tests against EU server

this hopefully helps with recent problems of spradically failing tests.

allow passing multiple classes as array

fixed interwiki test

minor optimization how cell counts are fixed in tables

array splice operations are expensive. when many cells in a table row
are missing, the operation should be executed only once instead for each

minor optimization how cell counts are fixed in tables

array splice operations are expensive. when many cells in a table row
are missing, the operation should be executed only once instead for each
missing cell.

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reformatting

use variable for wikiurl in tests

translate html and text string for signature

Default only text string exists, via localized translation a wiki admin
can add his/her own (html) version.

Add sleep(1) to remoteapicore to ensure new other timestap(=rev nr)

Could improve failing test of #1589

always separate a number and a unit by a non-breaking space