Initialize testing framework setup

[lsetiawan]

Overview

This PR adds a README to the tests directory, as well as moving things around to start setting up for a testing framework. Discussions will follow.

[codecov-commenter]

Codecov Report

Merging #902 (33cc4f2) into dev (f3ced32) will decrease coverage by 2.76%.
The diff coverage is 23.63%.

@@            Coverage Diff             @@
##              dev     #902      +/-   ##
==========================================
- Coverage   78.64%   75.88%   -2.77%     
==========================================
  Files          54       54              
  Lines        5132     5187      +55     
==========================================
- Hits         4036     3936     -100     
- Misses       1096     1251     +155     

Flag	Coverage Δ
unittests	75.88% <23.63%> (-2.77%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
echopype/testing.py	27.58% <23.63%> (-72.42%)	⬇️
echopype/consolidate/api.py	25.80% <0.00%> (-67.75%)	⬇️
echopype/utils/coding.py	25.92% <0.00%> (-66.67%)	⬇️
echopype/utils/prov.py	34.78% <0.00%> (-60.87%)	⬇️
echopype/utils/io.py	68.24% <0.00%> (-16.90%)	⬇️
echopype/calibrate/env_params.py	89.47% <0.00%> (-3.51%)	⬇️
echopype/echodata/echodata.py	78.50% <0.00%> (-2.69%)	⬇️
echopype/convert/set_groups_base.py	91.24% <0.00%> (-2.19%)	⬇️
echopype/calibrate/calibrate_ek.py	93.30% <0.00%> (-0.71%)	⬇️
echopype/convert/utils/ek_raw_parsers.py	55.74% <0.00%> (-0.17%)	⬇️

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[leewujung]

@lsetiawan: thanks for setting this up -- this looks great!

@emiliom @b-reyes and I just discussed this and we decided:

• we will not merge this PR until after the v0.6.4
• but we will get together next Wednesday to take care of all the needed changes! 🚀

[leewujung]

I'll use this PR as a parking space for things to remember for our hack session:

• make sure to create temp directory such as those from tempfile and in various tests into the hidden echopype working directory created in Add echopype working directory #896 (this will address half of Utilize echopype working directory #897)

[leewujung]

I have verified that all tests passed locally. Not sure what's going on with the CI in the last few runs. Some of the failures seemed to be outside of the plotting tests. The plotting tests were the ones that more often had this type of intermittent problem.

@emiliom : I think i'll wait until this last run finished and merge, regardless of whether everything passes, so that you can PR to this test-overhaul branch.

Update: actually I think something got messed up by the redo PRs. Maybe you could just have the branch on your fork until I resolve this?

[emiliom]

Update: actually I think something got messed up by the redo PRs. Maybe you could just have the branch on your fork until I resolve this?

Alright. See https://github.com/emiliom/echopype/tree/test-convert-refactor. That branch was developed on the latest dev as of Wednesday or early Thursday at the latest.