public function testGetInvoiceCommentsHtml()
{
$childBlock = $this->_layout->addBlock('Mage_Core_Block_Text', 'invoice_comments', 'block');
$expectedHtml = '<b>Any html</b>';
$this->assertEmpty($childBlock->getEntity());
$this->assertEmpty($childBlock->getTitle());
$this->assertNotEquals($expectedHtml, $this->_block->getInvoiceCommentsHtml($this->_invoice));
$childBlock->setText($expectedHtml);
$actualHtml = $this->_block->getInvoiceCommentsHtml($this->_invoice);
$this->assertSame($this->_invoice, $childBlock->getEntity());
$this->assertNotEmpty($childBlock->getTitle());
$this->assertEquals($expectedHtml, $actualHtml);
}
