One test which evaluates and compares the Auditory & Visual modalities is the Illinois Test of Psycholinguistic Ability (ITPA).
Expressive: To demonstrate an expressive ability by using touch signs (or by typing) to describe the meaning of an object being held in the hand.
Actual published tests that are typically used in the field vary in many ways from the ideal model we have just presented above, depending upon the goals of the test developers.
In addition, no single test covers all the processes that we have described here.
What teachers or special educators will do to assess language ability is collect a battery of tests that they feel will cover the most salient processes for their purposes.
One test in particular comes closest to our ideal model. That is the Illinois Test of Psycholinguistic Ability (ITPA).
It tests two modalities (Auditory and Visual) and provides normative data on each.