By Noah Barkin BERLIN (Reuters) - In a major test of her authority, Chancellor Angela Merkel will ask sceptical German lawmakers to back an 86 billion euro ($95.5 billion) bailout for Greece on Wednesday despite uncertainty over whether the IMF will play a role in the rescue. Parliamentary approval is not in doubt because the Social Democrats (SPD) and Greens are expected to back the deal. Kauder, who incensed fellow lawmakers last week with threats of retaliation if they rebelled and voted against a bailout, has described the involvement of the International Monetary Fund as a "condition" for the support of his party.