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`assert_changes` should always assert some change #31011
In the case of just a
My key change is that
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While using `assert_changes`, I came across some unexpected behavior: if you provide a `to:` argument, and the expression matches but didn't actually change, the assertion will pass. The way `assert_changes` reads, I assumed that it would both assert that there was any change at all, _and_ that the expression changed to match my `to:` argument. In the case of just a `from:` argument, `assert_changes` does what I expect as well. It asserts that the before value `=== from` and that the after value changed. My key change is that `assert_changes` will now _always_ assert that expression changes, no matter what combination of `from:` and `to:` arguments