test(py-target): add test cases for custom Python-based targets

src/test/resources/py/tests/target/pyTarget-001.test.ttl

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+# baseURI: http://datashapes.org/py/tests/target/pyTarget-001.test
+# imports: http://datashapes.org/dash
+# prefix: ex
+
+@prefix dash: <http://datashapes.org/dash#> .
+@prefix ex: <http://datashapes.org/py/tests/target/pyTarget-001.test#> .
+@prefix owl: <http://www.w3.org/2002/07/owl#> .
+@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
+@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
+@prefix sh: <http://www.w3.org/ns/shacl#> .
+@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
+
+<http://datashapes.org/py/tests/target/pyTarget-001.test>
+  rdf:type owl:Ontology ;
+  rdfs:label "Test of sh:PyTarget 001" ;
+  owl:imports <http://datashapes.org/dash> ;
+.
+ex:GraphValidationTestCase
+  rdf:type dash:GraphValidationTestCase ;
+  dash:expectedResult [
+      rdf:type sh:ValidationReport ;
+      sh:conforms "false"^^xsd:boolean ;
+      sh:result [
+          rdf:type sh:ValidationResult ;
+          sh:focusNode ex:InvalidInstance1 ;
+          sh:resultPath rdfs:label ;
+          sh:resultSeverity sh:Violation ;
+          sh:sourceConstraintComponent sh:MaxCountConstraintComponent ;
+          sh:sourceShape ex:TestShape-label ;
+        ] ;
+    ] ;
+.
+ex:InvalidInstance1
+  rdf:type owl:Thing ;
+  rdfs:label "Invalid instance1" ;
+.
+ex:TestShape
+  rdf:type sh:NodeShape ;
+  rdfs:label "Test shape" ;
+  sh:property ex:TestShape-label ;
+  sh:target [
+      rdf:type sh:PyTarget ;
+      sh:pyLibrary [
+        a sh:PyLibrary ;
+        sh:pyLibraryURL "http://datashapes.org/py/tests/target/py_target-001.py"^^xsd:anyURI ;
+      ] ;
+      sh:pyFunctionName "py_target001" ;
+  ] ;
+.
+ex:TestShape-label
+  sh:path rdfs:label ;
+  rdfs:comment "Must not have any rdfs:label" ;
+  rdfs:label "label" ;
+  sh:datatype xsd:string ;
+  sh:maxCount 0 ;
+.
+ex:ValidInstance1
+  rdf:type owl:Thing ;
+.

src/test/resources/py/tests/target/py_target-001.py

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+def py_target001(_this):
+    target_nodes = []
+    rdf_type = py_tf.namedNode("http://www.w3.org/1999/02/22-rdf-syntax-ns#type")
+    owl_thing = py_tf.namedNode("http://www.w3.org/2002/07/owl#Thing")
+    it = _data.find(_this, rdf_type, owl_thing)
+    while t := it.next():
+        target_nodes.append(t.getSubject())
+    return target_nodes