Urine tests generally don't test for alcohol.
The more common urine test administered something with a "-5" in it tests for: Cannabis, Cocaine, Amphetamines, PCP, and Opiates.
Not to mention...
Metabolites of alcohol will be present up to 12 hours, they show a ratio of how much you have drank and how long ago. The more you drink, the longer it will show up for. The test has to be looking...