August 2017
Beginner
374 pages
10h 41m
English
Content preview from Learning Redux
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Numbers
Jest also offers various matchers for comparing numbers:
- toBeGreaterThan: This expects the OUTPUT to be greater than the COMPARISON: OUTPUT > COMPARISON
- toBeGreaterThanOrEqual: This expects the OUTPUT to be greater than or equal to the COMPARISON: OUTPUT >= COMPARISON
- toBeLessThan: This expects the OUTPUT to be less than the COMPARISON: OUTPUT < COMPARISON
- toBeLessThanOrEqual: This expects the OUTPUT to be less than or equal to the COMPARISON: OUTPUT <= COMPARISON
Of course, you can also use toBe and toEqual for numbers (as we did in the first example).
For floating point numbers, there is a special matcher: toBeCloseTo. This matcher is useful when dealing with rounding errors in floating point calculations; for example:
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.