Move the test data file and add some comments

Mainly so it is clear where the file is being used from.

test/data/contrived/README.md

@@ -0,0 +1,5 @@
+# Contrived Test Data
+
+This directory contains test data contrived for specific purposes. Files in this
+directory should clearly indicate their purpose with a comment.
+

test/data/defined_namespaces/multiple-comments.ttl → test/data/contrived/multiple-comments.ttl

@@ -2,6 +2,10 @@
 @prefix owl:            <http://www.w3.org/2002/07/owl#> .
 @prefix ex:             <http://example.org/multiline-string-example#> .
 
+# This file contains a RDF class with multiple rdfs:comment properties and is
+# used to verify the RDFLib defined namespace creator. It is used in
+# </test/test_namespace/test_definednamespace_creator.py>.
+
 <http://example.org/multiline-string-example>
     a owl:Ontology .
 
@@ -10,4 +14,4 @@ ex:SomeClass a rdfs:Class, owl:Class;
     rdfs:comment "If one uses multiple comment properties, "@en;
     rdfs:comment "then it should still only create a single class variable."@en;
     rdfs:isDefinedBy <http://example.org/multiline-string-example>;
-.
+.

test/test_namespace/test_definednamespace_creator.py

@@ -129,10 +129,7 @@ def test_definednamespace_creator_multiple_comments():
         / "defined_namespace_creator.py"
     )
     multiple_comments_data_file = (
-        Path(__file__).parent.parent
-        / "data"
-        / "defined_namespaces"
-        / "multiple-comments.ttl"
+        Path(__file__).parent.parent / "data" / "contrived" / "multiple-comments.ttl"
     )
     print("\n")
     print(f"Using {definednamespace_script}...")