Redo of the unit tests

[MaillPierre]

Currently most of the unit tests are:

• Badly named
• implemented using LDScript
• uncommented
• Not directly linked to one function
• of unknown coverage

We need to correct that

[FabienGandon]

Talked to @pchampin and the first pointers for tests are:

• RDF Test Suite Curation Community Group https://www.w3.org/groups/cg/rdf-tests/
• Repository for the RDF Tests Community Group https://github.com/w3c/rdf-tests
• RDF Test Suite https://w3c.github.io/rdf-tests/rdf/
• RDF and SPARQL Test Suites https://w3c.github.io/rdf-tests/

[FabienGandon]

Fun fact : media types have a dereferenceable URI with a description in Turtle
e.g. https://www.w3.org/ns/iana/media-types/image/gif

@prefix : <#>.
@prefix reg: <https://www.w3.org/ns/assignments/reg#>.
@prefix html: <https://tools.ietf.org/html/>.
@prefix medi: <../media-types.ttl#>.

:Resource
    reg:file [ reg:file "image/gif"; reg:type "template" ];
    reg:name "gif";
    reg:xref html:rfc2045, html:rfc2046.
medi:image reg:record :Resource.

more at https://www.w3.org/ns/iana/media-types/
full dump https://www.w3.org/ns/iana/media-types/media-types.ttl