Major update to test framework

[tfukaza]

The biggest change in this PR is the updated and near-final live testing framework. Running unit tests in test/livetests will execute a series of test that will use a real broker for tests.

The directory contains three types of files:

• test_streamer_common.py: Tests features that are common to all streamers.
• test_broker_common.py: Tests features that are common to all brokers.
• test_api_[BROKER].py: Tests specific to [BROKER]

For the first two, there is a decorator @decorator_repeat_test defined. This allows the same test to be run for different brokers. For example, decorating a test with @decorator_repeat_test([Robinhood, Webull]) will run the test for Robinhood and Webull.

Currently only Robinhood is being tested, as other brokers seem to have lots of bugs. We want to hold off debugging those until the API class API is stabilized.

For now, we ask developers to run these tests locally with their own credentials. To run the tests, the SECRET_PATH env variable needs to be set to specify where secret.yaml is for the brokers.

[codecov[bot]]

Codecov Report

Merging #261 (162c84b) into main (fcdd55d) will decrease coverage by 0.14%. The diff coverage is 20.53%.

@@            Coverage Diff             @@
##             main     #261      +/-   ##
==========================================
- Coverage   55.63%   55.48%   -0.15%     
==========================================
  Files          24       24              
  Lines        3764     3765       +1     
==========================================
- Hits         2094     2089       -5     
- Misses       1670     1676       +6     

Flag	Coverage Δ
unittests	55.48% <20.53%> (-0.15%)	:arrow_down:

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

Impacted Files	Coverage Δ
harvest/api/alpaca.py	3.04% <0.00%> (-0.17%)	:arrow_down:
harvest/api/kraken.py	2.38% <0.00%> (+0.05%)	:arrow_up:
harvest/api/paper.py	83.78% <ø> (ø)
harvest/api/robinhood.py	1.51% <0.00%> (-0.03%)	:arrow_down:
harvest/api/webull.py	1.47% <0.00%> (ø)
harvest/storage/base_storage.py	81.08% <57.14%> (+1.97%)	:arrow_up:
harvest/api/_base.py	69.20% <66.66%> (-1.54%)	:arrow_down:
harvest/utils.py	86.62% <81.81%> (+0.33%)	:arrow_up:
harvest/api/yahoo.py	82.75% <100.00%> (+0.09%)	:arrow_up:
harvest/trader/trader.py	84.34% <100.00%> (+0.11%)	:arrow_up:
... and 2 more

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