Update unittest

[galalen]

Description

Write unit tests for BatteryStatusRepository and update unit test for SyftWebSocket, fixes issue 123.

Affected Dependencies

None.

How has this been tested?

Run the test cases.

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have commented my code following the OpenMined Styleguide
• [x] I have labeled this PR with the relevant Type labels
• [x] My changes are covered by tests

[codecov[bot]]

Codecov Report

Merging #281 into dev will increase coverage by 0.59%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##              dev     #281      +/-   ##
==========================================
+ Coverage   60.72%   61.31%   +0.59%     
==========================================
  Files          44       44              
  Lines        1487     1489       +2     
  Branches      195      195              
==========================================
+ Hits          903      913      +10     
+ Misses        492      484       -8     
  Partials       92       92              

Impacted Files	Coverage Δ
...openmined/syft/networking/clients/SyftWebSocket.kt	79.16% <75.00%> (+0.90%)	:arrow_up:
...ed/syft/monitor/battery/BatteryStatusRepository.kt	90.90% <0.00%> (+45.45%)	:arrow_up:
...enmined/syft/monitor/battery/BatteryStatusModel.kt	100.00% <0.00%> (+75.00%)	:arrow_up:

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