Add nidigital system tests for remaining source and capture methods

[ni-jfitzger]

• This contribution adheres to CONTRIBUTING.md.

• I've updated CHANGELOG.md if applicable.

• I've added tests applicable for this pull request

What does this Pull Request accomplish?

• Adds test test_create_source_waveform_serial
• Adds test test_create_source_waveform_from_file_tdms
• Adds test test_write_source_waveform_data_from_file_tdms
• Adds test test_create_capture_waveform_serial
• Adds test test_create_capture_waveform_from_file_digicapture

List issues fixed by this Pull Request below, if any.

What testing has been done?

Ran system tests on a system with ni-digital 19.0.1 installed.

[codecov]

Codecov Report

Merging #1431 into master will increase coverage by 0.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1431      +/-   ##
==========================================
+ Coverage   91.90%   92.80%   +0.90%     
==========================================
  Files          20       30      +10     
  Lines        3642     6423    +2781     
==========================================
+ Hits         3347     5961    +2614     
- Misses        295      462     +167     

Flag	Coverage Δ
#codegenunittests	88.24% <ø> (ø)
#nidcpowersystemtests	98.58% <ø> (?)
#nidigitalsystemtests	95.37% <ø> (?)
#nidmmsystemtests	95.48% <ø> (?)
#nifakeunittests	96.40% <ø> (+0.03%)	⬆️
#nimodinstsystemtests	87.23% <ø> (?)
#nimodinstunittests	95.37% <ø> (ø)
#niscopesystemtests	83.15% <ø> (?)
#nisesystemtests	100.00% <ø> (?)
#niswitchsystemtests	98.11% <ø> (?)
#nitclksystemtests	100.00% <ø> (?)
#nitclkunittests	95.45% <ø> (ø)

Impacted Files	Coverage Δ
generated/niswitch/niswitch/_library.py	98.11% <0.00%> (ø)
generated/nidigital/nidigital/_library.py	95.16% <0.00%> (ø)
generated/nitclk/nitclk/_library.py	100.00% <0.00%> (ø)
generated/nidcpower/nidcpower/_library.py	98.58% <0.00%> (ø)
generated/nimodinst/nimodinst/_library.py	87.23% <0.00%> (ø)
generated/nise/nise/_library.py	100.00% <0.00%> (ø)
generated/niscope/niscope/_library.py	86.69% <0.00%> (ø)
generated/niscope/niscope/waveform_info.py	57.35% <0.00%> (ø)
...digital/nidigital/history_ram_cycle_information.py	100.00% <0.00%> (ø)
generated/nidmm/nidmm/_library.py	95.48% <0.00%> (ø)
... and 2 more

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[ni-jfitzger]

@sbethur Please review this PR very carefully. The tests pass, but I really have no idea what I'm doing or how these methods really work. I just stole code from other tests and messed with it until it passed. There's a fair chance that I missed, messed up or overlooked something that matters outside the execution of the methods being tested.

[ni-jfitzger]

Note that between the renamed test_files project and the new test_create_capture_waveform_serial project, some files may be exactly the same, leading Git to be confused about which file was renamed and which was added.

[sbethur]

test this please