Test clearing using a cid.
function testClearCid() {
cache_set('test_cid_clear', $this->default_value, $this->default_bin);
$this
->assertCacheExists(t('Cache was set for clearing cid.'), $this->default_value, 'test_cid_clear');
cache_clear_all('test_cid_clear', $this->default_bin);
$this
->assertCacheRemoved(t('Cache was removed after clearing cid.'), 'test_cid_clear');
cache_set('test_cid_clear1', $this->default_value, $this->default_bin);
cache_set('test_cid_clear2', $this->default_value, $this->default_bin);
$this
->assertTrue($this
->checkCacheExists('test_cid_clear1', $this->default_value) && $this
->checkCacheExists('test_cid_clear2', $this->default_value), 'Two caches were created for checking cid "*" with wildcard false.');
cache_clear_all('*', $this->default_bin);
$this
->assertTrue($this
->checkCacheExists('test_cid_clear1', $this->default_value) && $this
->checkCacheExists('test_cid_clear2', $this->default_value), 'Two caches still exists after clearing cid "*" with wildcard false.');
}