Brewing beer Kata 1st. draft

I am giving a 15min. lightning talk at @brewww "TypeScript kata: The TDD style" Friday 22. of marts.

And thougt I would make a brewing beer kata to the talk, though I'm not sure the following kata is good enough as a standard Kata, please give comment to improvements. Ill promise to post the final Kata in TypeScript later :-)

First draft of the kata:

1. Create a simple Brewary with a method IBeer Brew()
1. The method take 0 parameters but needs to return an IBeer
2. The Beer should be of type lager
2. Allow the Brew method to handle a brewingTemperature and a fermentationInDays argument
1. If brewingTemperature is less than 5 throw exception “Temperature is to low”
2. If brewingTemperature is greater than 4 and less than 11 return a beer of type lager
3. If fermentationInDays is less than 7 and greater than 14 throw exception “fermentation for lager beers should be between 7 and 14 days”
3. Add optional ingredients of type string as “roasted malt” and “barley” to make a stout
1. If fermentationInDays less than 5 and greater than 6 throw exception “fermentation for stouts beers should be 5 or 6 days”
2. brewingTemperature not equal 20 throw exception
3. Expect result to be of type Stout
4. Expect beers alcohol to be 7percent if fermentationInDays is 5
5. Expect beers alcohol to be 8percent if fermentationInDays is 6