public function test_action_keyed_array() {
    $a = new MockAction();

    $tag = __FUNCTION__;

    add_action( $tag, array( &$a, 'action' ) );

    $context = array( 'key1' => 'val1' );
    do_action( $tag, $context );

    $args = $a->get_args();
    $this->assertSame( $args[0][0], $context );

    $context2 = array(
      'key2' => 'val2',
      'key3' => 'val3',
    );
    do_action( $tag, $context2 );

    $args = $a->get_args();
    $this->assertSame( $args[1][0], $context2 );

  }