Additional SHACL tests and tests for the SHACL tests themselves #16
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In this pull request, I add the SHACL-based tests I suggested in http://www.phyloref.org/blog/2016/10/validating-shapes/, namely:
I also add a test script that deliberately constructs invalid trees to ensure that the SHACL tests catch them. This lead to me rearranging the SHACL code somewhat.