Property Based Tests with IPFS

[Danwhy]

I think it would be a good idea to run some property based tests for this module, where we generate strings, maps and structs and run our Cid.cid function.

We can then compare the results of these function calls with the ipfs result of the same values.

This will provide us with a comprehensive list of tests, that change every time we run them, meaning we can be sure the module is creating the cid correctly every time.

• install ipfs to travis
• create property based tests
  • generate random strings/maps
  • compare result of cid function to ipfs function

[Danwhy]

This will require us to download ipfs to travis to run our tests:

https://docs.ipfs.io/introduction/install/

[nelsonic]

@Danwhy now you're onto something! 😍

[RobStallion]

Going to try and install IPFS locally on @Danwhy 's machine with curl and the commands from IPFS. If we can do this on his machine then we should be able to recreate these steps with travis.

[nelsonic]

@Danwhy / @RobStallion thank you for adding the T4 Label (_which seems reasonable if you document how to set-up IPFS CLI on Travis-CI and add some notes on Property-based-Testing to the README.md (or a separate doc) of https://github.com/dwyl/learn-elixir as per dwyl/learn-elixir#93

Please take a few minutes to follow dwyl/product-ux-research#34
(i.e. install and use the app to track the actual time you take on this issue...)

Thanks! (and keep up the great effort!) ✨

[RobStallion]

Travis failed to build with the updated yml file.

$ ./install.sh
We cannot install ./ipfs in one of the directories /usr/local/bin /usr/bin
It seems that we do not have the necessary write permissions.
Perhaps try running this script as a privileged user:
    sudo ./install.sh
The command "./install.sh" failed and exited with 1 during .
Your build has been stopped.

Going to try suggested fix.

[Danwhy]

Installed correctly, just need to make sure we cd back out of the ipfs directory

[RobStallion]

Successfully installed IPFS on travis...

[RobStallion]

forgetting basic steps...

Going to add ipfs init to travis yml

[Danwhy]

Tests added and running on Travis 👍