code: public function generateSubclass($methods)
      {
          if (! $this->reflection->classOrInterfaceExists()) {
              return false;
          }
          $mock_class = "";
          if (!empty($this->namespace)) {
              $mock_class .= $this->namespace . '\\';
          }
          $mock_class .= $this->mock_class;
          $mock_reflection = new SimpleReflection($mock_class);
          if ($mock_reflection->classExistsWithoutAutoload()) {
              return false;
          }
          if ($this->reflection->isInterface() || $this->reflection->hasFinal()) {
              $code = $this->createCodeForClass($methods ? $methods : array());
  
              return eval("$code return \$code;");
          } else {
              $code = $this->createCodeForSubclass($methods ? $methods : array());
  
              return eval("$code return \$code;");
          }
      }
docs: Subclasses a class and overrides every method with a mock one
  that can have return values and expectations set.
  Chains to an aggregated SimpleMock.
  
  @param array $methods Additional methods to add beyond
  those in the cloned class. Use this
  to emulate the dynamic addition of
  methods in the cloned class or when
  the class hasn't been written yet.