January 2019
Intermediate to advanced
376 pages
8h 49m
English
Content preview from Property-Based Testing with PropEr, Erlang, and Elixir
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Implementing Specials
So we have a more complex generator for specials, and a basic checkout implementation that doesn’t consider specials at all. We have everything we need to get started on implementing specials. Our first step should be making sure our test actually fails eventually, as a sanity check to know it’s good at detecting bad cases:
| | $ rebar3 proper |
| | build information and other properties |
| | ===> Testing prop_checkout:prop_special() |
| | ......! |
| | Failed: After 7 test(s). |
| | {[[0],[6,1],[0],[0],[6,1],[6,1],[6,1],[0],[6,1],[6,1],[0],[6,1],[6,1],[6,1], |
| | [6,1],[6,1],[6,1],[6,1],[6,1],[0],[6,1],[6,1],[6,1],[0],[6,1],[0],[0],[6,1], |
| | [6,1],[6,1],[6,1],[0],[0],[0],[6,1],[6,1],[0]],20,[{[0],-2},{[6,1],1}], |
| | [{[0],2,3},{[6,1],5,0}]} |
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