[tests] Improve the basic framework of our test suite.

We now have a base test case class for Predis (namely PredisTestCase)
grouping various commonly used utility methods shared by all of the
tests in the suite, greatly improving reusability.

tests/Predis/Connection/ConnectionParametersTest.php

@@ -11,13 +11,13 @@
 
 namespace Predis\Connection;
 
-use PHPUnit_Framework_TestCase as StandardTestCase;
+use PredisTestCase;
 
 /**
  * @todo ConnectionParameters::define();
  * @todo ConnectionParameters::undefine();
  */
-class ParametersTest extends StandardTestCase
+class ParametersTest extends PredisTestCase
 {
     /**
      * @group disconnected
@@ -220,18 +220,6 @@ class ParametersTest extends StandardTestCase
         );
     }
 
-    /**
-     * Returns a named array with the default connection parameters merged with
-     * the specified additional parameters.
-     *
-     * @param array $additional Additional connection parameters.
-     * @return array Connection parameters.
-     */
-    protected function getParametersArray(array $additional)
-    {
-        return array_merge($this->getDefaultParametersArray(), $additional);
-    }
-
     /**
      * Returns an URI string representation of the specified connection parameters.
      *