Add collection subsetOf assertion for NUnit, xUnit and MsTest.#144

Merged

sergey-tihon merged 4 commits intofsprojects:masterfrom CaptnCodr:feature/subsetOf

Nov 2, 2019

+144-12

Commits on Oct 31, 2019

Commits on Nov 2, 2019

Fix copy paste error.
CaptnCodr
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