Spec-ifying NGramTest

[snabar]

Changing the NGramTest to extend SwTransformerSpec

[salesforce-cla]

Thanks for the contribution! It looks like @snabar is an internal user so signing the CLA is not required. However, we need to confirm this.

[tovbinm]

@snabar lgtm. something is off with the style. please fix

[codecov]

Codecov Report

Merging #297 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #297   +/-   ##
=======================================
  Coverage   86.25%   86.25%           
=======================================
  Files         320      320           
  Lines       10471    10471           
  Branches      352      352           
=======================================
  Hits         9032     9032           
  Misses       1439     1439

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[tovbinm]

@snabar please sign the CLA

[snabar]

@tovbinm It took me to some google form to confirm that i was a salesforce employee, and i filled out the form.