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I got many clients who cheat with the freelancer. Suppose, you need 50 unique articles. You post a job. 100 of candidates applied your job. You call almost 60 people for interview and you ask them to write an article. Each person write on different topic. So you will get your desire 50 articles. And at last you close that job. I'm a victim. That's why, in interview if any client ask me to write an article, i'll surely copy paste What do you think? Is it right?
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Don't write free articles. If the client wishes to hire you for a test, they need to pay you for it. If the client wishes to see your writing capabilities, then they need to look at the original pieces of work that you add to your portfolio.