test: add variants for blank prefixes and base (#2421)

Test that the base directive and blank prefixes are handled correctly.

Author: aucampia

test/data/variants/blank_and_base_prefix-asserts.json

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+{
+  "quad_count": 6,
+  "exact_match": true
+}

test/data/variants/blank_and_base_prefix.nt

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+<http://example.org/blank_prefix#subject0> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Class> .
+<http://example.org/blank_prefix#subject0> <http://www.w3.org/2000/01/rdf-schema#label> "subject0"@en .
+<http://example.org/blank_prefix#subject0> <http://example.org/blank_prefix#predicate00> <http://example.org/blank_prefix#object00> .
+<http://example.org/blank_prefix#subject1> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/2002/07/owl#Class> .
+<http://example.org/blank_prefix#subject1> <http://www.w3.org/2000/01/rdf-schema#label> "subject0"@en .
+<http://example.org/blank_prefix#subject1> <http://example.org/blank_prefix#predicate10> <http://example.org/blank_prefix#object10> .

test/data/variants/blank_and_base_prefix.ttl

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+@base                   <http://example.org/blank_prefix> .
+@prefix :               <http://example.org/blank_prefix#> .
+@prefix rdfs:           <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix owl:            <http://www.w3.org/2002/07/owl#> .
+
+# A Turtle document using both a blank and a base prefix together with well
+# known prefixes.
+
+:subject0 a owl:Class;
+    rdfs:label "subject0"@en;
+    :predicate00 :object00;
+    .
+
+<#subject1> a owl:Class;
+    rdfs:label "subject0"@en;
+    <#predicate10> <#object10>;
+    .

test/data/variants/blank_and_base_prefix.xml

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+<rdf:RDF
+    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+    xmlns:egdo="http://example.org/"
+    xmlns:owl="http://www.w3.org/2002/07/owl#"
+    xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
+    xmlns="http://example.org/blank_prefix#"
+    xml:base="http://example.org/blank_prefix">
+
+  <!--
+    An RDF/XML document using both a blank and a base prefix together with well
+    known prefixes.
+  -->
+
+  <rdf:Description rdf:about="#subject0">
+    <predicate00 rdf:resource="#object00"/>
+    <rdfs:label xml:lang="en">subject0</rdfs:label>
+    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#Class"/>
+  </rdf:Description>
+
+  <rdf:Description rdf:about="#subject1">
+    <predicate10 rdf:resource="#object10"/>
+    <rdfs:label xml:lang="en">subject0</rdfs:label>
+    <rdf:type rdf:resource="http://www.w3.org/2002/07/owl#Class"/>
+  </rdf:Description>
+
+</rdf:RDF>