There will certainly be companies that offer writing tests. The more important question for you, however, is validation. Most companies offering writing tests will tell you they've done national validation studies, or that their studies have been proven effective across a wide base of industries. This is not an acceptable way to look at validation studies, at least from a regulatory perspective. Any tests that are used for selection- and/or decision-making purposes should have the following two characteristics: 1. They should have been validated for the particular workforce at issue 2. They should have been validated for the specific jobs at issue Thus, if you're going to use a writing test to determine whether candidates for marketing positions are viable candidates, you will need to create and use a writing test that is validated for your company at whatever location the marketing candidates will be based that specifically evaluates writing skills used for marketing positions. I have personally found very few situations where companies are using properly validated tests. Conversely, I have seen plenty of examples where a test bought "off-the-shelf" that has been "validated" for use throughout the United States is being used to make decisions. These tests too often have a disparate impact on some protected class. If you strongly feel that you want to create a writing test that will evaluate candidates, I'd encourage you to work with a local college or university to specifically develop a test that is specific to your organization and to the positions where the test will be used. I recognize this is neither the answer you were seeking, nor is it an answer that everyone will agree with. However, in the current regulatory environment, where tests are coming under increasing scrutiny by regulatory agencies, I would urge great caution in the creation and use of tests. This is especially the case with something like a writing test, where it will be much more difficult to develop a set of objective measures than it might be for something like a welding test.
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