Yes. Is that unreasonable?
Students who miss several days very near a test might get an extension. But missing one day, or even two, a few days before a test? Not so much.
I post my assignments online. Even if students can't tell we're getting near the end of a chapter, I post test dates over a week in advance--online and in class. Dates are not a surprise.
I don't see a benefit in running my class cafeteria-style, where students get to pick and choose on which dates they want to take tests and quizzes. We all take the same test on the same day--I'm very "one size fits all" that way. If a student is absent, they take the same test upon their return but are not eligible for a bonus question, which amounts to extra credit on the test. Taking the test late causes them to miss a lesson covering new material. I don't hand back a test until all students in all of my classes have taken it.
I kid you not, if I gave in to all the requests to take the test or quiz "tomorrow", I'd only have half my students taking the test or quiz on the day I schedule it.
At some point, a "due date" really is a "due date".