Most fats will increase testosterone, and contrary to what you are reading the absolute best way to increase it is by combining a saturated fat with n-3 fats. In other words eat a steak and chase it with a tbsp of flax oil. Also it is has been documented that eating any meal in which less than 25% of the total calories coming from fat will lower serum testosterone levels within 2-3 hours of consuming it. The n-3 fats will aslo increase androgen receptor sensitivity which will help utilize the testosterone being produced more effeciently.
As a side note, if you are trying to elevate testosterone levels completely avoid all soy products.