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kern/minitest-reporters#103: Switching from PowerBar to ruby-progressbar
PowerBar seems to be a bit defunct (last updated a year ago, years-old issues sitting open). But, most importantly, the `ProgressReporter` makes my tests run 50% slower than any other reporter. That doesn’t seem right—whatever is being done to generate the progress bar couldn’t possibly be complicated enough to increase the test run time by 50%. Since PowerBar is defunct I figured the easiest way is to just switch to something actively developed, like ruby-progressbar, and that did the trick. Test run times with the `ProgressReporter` now average the same as the other reporters. The output will almost be completely identical. The one change I made is that now only the progress bar will be colored. Previously the entire line would be green, and then change to yellow or red if there was a skip or failure. Now only the progress bar itself will change color, which makes the output visually easier to read.
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