test: testSuite minor improvements

[tbruyelle]

• Use t.Name() instead of providing a name as an argument. This only removes verbosity.

• Call t.Helper() at the beginning of testSuite's methods that makes assertions. This improves the output of failing tests, instead of having a referrence to the testSuite_test.go file, you get a referrence to the dom_test.go file.

[codecov-io]

Codecov Report

Merging #234 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #234   +/-   ##
=======================================
  Coverage   57.64%   57.64%           
=======================================
  Files           3        3           
  Lines         654      654           
=======================================
  Hits          377      377           
  Misses        219      219           
  Partials       58       58

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