public function testStyleAttribute()
{
$column = new Column();
$column->addStyleAttribute('color:white;');
$style_attr = $column->getStyleAttribute();
$expected = 'color:white';
$this->assertEquals($expected, $style_attr);
$column->addStyleAttribute(';background-color:black;');
$style_attr = $column->getStyleAttribute();
$expected = 'color:white;background-color:black';
$this->assertEquals($expected, $style_attr);
$column->addStyleAttribute('position:fixed;top:0;left:50px');
$style_attr = $column->getStyleAttribute();
$expected = 'color:white;background-color:black;position:fixed;top:0;left:50px';
$this->assertEquals($expected, $style_attr);
}
