Introduce NewTestLocalNode, simplify tests

[Geod24]

Once again, getting rid of missing error checks and simplifying test code by providing trivial wrapper... Which would not be necessary if go had default parameter, but that's another story.

[codecov-io]

Codecov Report

Merging #922 into master will decrease coverage by 0.01%. The diff coverage is 58.33%.

@@            Coverage Diff             @@
##           master     #922      +/-   ##
==========================================
- Coverage   60.75%   60.73%   -0.02%     
==========================================
  Files         159      160       +1     
  Lines       11260    11267       +7     
==========================================
+ Hits         6841     6843       +2     
- Misses       3615     3617       +2     
- Partials      804      807       +3

Flag	Coverage Δ
#integration_tests_long_term	44.05% <25%> (+0.18%)	:arrow_up:
#integration_tests_node	40.52% <25%> (-0.04%)	:arrow_down:
#integration_tests_retry	37.69% <25%> (-0.04%)	:arrow_down:
#unittests	47.36% <58.33%> (-0.07%)	:arrow_down:

Impacted Files	Coverage Δ
lib/network/test.go	100% <100%> (ø)	:arrow_up:
lib/node/local_node.go	79% <50%> (-2.64%)	:arrow_down:
lib/node/test.go	60% <60%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 6a0f6ca...0f57854. Read the comment docs.

[codecov-io]

Codecov Report

Merging #922 into master will decrease coverage by 0.01%. The diff coverage is 58.33%.

@@            Coverage Diff             @@
##           master     #922      +/-   ##
==========================================
- Coverage   60.75%   60.73%   -0.02%     
==========================================
  Files         159      160       +1     
  Lines       11260    11267       +7     
==========================================
+ Hits         6841     6843       +2     
- Misses       3615     3617       +2     
- Partials      804      807       +3

Flag	Coverage Δ
#integration_tests_long_term	44.05% <25%> (+0.18%)	:arrow_up:
#integration_tests_node	40.52% <25%> (-0.04%)	:arrow_down:
#integration_tests_retry	37.69% <25%> (-0.04%)	:arrow_down:
#unittests	47.36% <58.33%> (-0.07%)	:arrow_down:

Impacted Files	Coverage Δ
lib/network/test.go	100% <100%> (ø)	:arrow_up:
lib/node/local_node.go	79% <50%> (-2.64%)	:arrow_down:
lib/node/test.go	60% <60%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 6a0f6ca...0f57854. Read the comment docs.