Allow tests to declare 'requirements', skip tests where requirements are not met

This should be added as phpdoc for getInfo() as well.

Otherwise looks great.

API addition so needs a change notification once it's in.

Why not just wrap the test class itself in function_exists('gzopen') { // Class definition }?

Also what about returning a flag from getInfo() rather than array of function names. I could see checks for ini_get, classes and other stuff that's not functions being useful here.

Let's just make an access static function for tests that gets called and returns a TRUE/FALSE value.

class MyTestCase extends DrupalWebTestCase {
  public static function getInfo() {
    ...
  }

  public static function getAccess() {
    return function_exists('gzopen');
  }
}

This or give a way for tests to stop executing in setUp() gracefully.

I like the suggestion from #7 since adding in the check is actually quite easy (it can be added to DrupalTestCase so then any other type of tests that are subclasses of DrupalTestCase can also get checked for access) and any test that requires any additional requirements can implement their check fairly easily. I tested this out and got tests to appear/disappear as necessary. Attaching patch.

Ack...whitespace. Attaching new patch.

We dont want this apparently.

Followup that never got linked from here: #1273478: Implement @requires and @dependencies within TestBase, mark tests as skipped