It depends.

If the block is an involved patter, has a combination where I can't easily add the math, or has inset seams, then yes.

If taking direction from a magazine pattern that has strip piecing instructions, I want to know that I won't miscut my stash in case I don't test their instructions on a test piece.

If I am not sure about my color choices, it is a good idea to see the block made up.

Test block? Sounds like a good idea, I'll try it sometime.

I always do and I cut fabric as I go. I would never cut out an entire anything because then I might not finish it. and the cut fabric is wasted, or worse, all messed up.

Yes.I'd rather have a block that for whatever reason I don't care for, than a whole quilt cut out....& a quilt I don't like.Started doing sample blocks yrs ago after realizing there's no way I'll make a K/Q size quilt out of blocks I hate.But, that's just me.BTW....I have enough blocks to whip out a table runner or wall quilt from samples.Works for me.

I never have, but it sounds like a good idea. I might have to do this in the future. I like the idea of using all the blocks later so they're not wasted.

Actually, I'm in the process of making some hot pads to try out some blocks that I want to use for my GDs quilts.

No testing! Sewing!

I do when it is a new pattern or idea. Pattern makers do make printing mistakes and that can be costly if you don't have extra fabric to make the block over. Ask me how I know!

It's a great idea but I don't. My impatience gets the better of me. Maybe next time I'll force myself to slow down and make that sample block.

I do quite a bit, especially if it's a new-to-me technique. I've even drawn it on kraft paper to verify my measurements.