Added test for ForwardRuleReasonerOWLHorst R6 rule

Author: patrickwestphal

sansa-inference-spark/src/test/resources/forward_chaining/axioms/test_r6.owl

@@ -0,0 +1,21 @@
+Prefix(:=<http://ex.com/default#>)
+
+Ontology(<http://ex.com/ont/sample1.owl>
+  <http://ex.com/ont/release/123/sample1.owl>
+
+  Declaration(Class(:Cls01))
+  Declaration(Class(:Cls02))
+  Declaration(Class(:Cls03))
+  Declaration(Class(:Cls04))
+
+  SubClassOf(:Cls02 :Cls01)
+  SubClassOf(:Cls03 :Cls01)
+
+  Declaration(NamedIndividual(:indivA))
+  Declaration(NamedIndividual(:indivB))
+  Declaration(NamedIndividual(:indivC))
+
+  ClassAssertion(:Cls03 :indivA)
+  ClassAssertion(:Cls02 :indivB)
+  ClassAssertion(:Cls04 :indivC)
+)

sansa-inference-spark/src/test/scala/net/sansa_stack/inference/spark/forwardchaining/axioms/ForwardRuleReasonerOWLHorstTest.scala

@@ -238,4 +238,31 @@ class ForwardRuleReasonerOWLHorstTest extends FunSuite with SharedSparkContext w
     assert(inferred.size == 1)
     assert(inferred.contains(df.getOWLClassAssertionAxiom(cls01, indivC)))
   }
+
+  /**
+    * R6:
+    *   Condition:
+    *     c rdfs:subClassOf c1
+    *     v rdf:type c
+    *   Consequence:
+    *     v rdf:type c1
+    */
+  test("Rule R6 should return correct results") {
+    val cls01 = df.getOWLClass(defaultPrefix + "Cls01")
+    val indivA = df.getOWLNamedIndividual(defaultPrefix + "indivA")
+    val indivB = df.getOWLNamedIndividual(defaultPrefix + "indivB")
+
+    val input = getClass.getResource(resourcePath + "test_r6.owl").getPath
+
+    val axiomsRDD = spark.owl(Syntax.FUNCTIONAL)(input)
+    val reasoner = new ForwardRuleReasonerOWLHorst(sc, sc.defaultMinPartitions)
+    val inferred: Seq[OWLAxiom] = reasoner.apply(axiomsRDD).collect()
+
+    // Two axioms should be inferred:
+    // ClassAssertion(bar:Cls1 :indivA)
+    // ClassAssertion(bar:Cls1 :indivB)
+    assert(inferred.size == 2)
+    assert(inferred.contains(df.getOWLClassAssertionAxiom(cls01, indivA)))
+    assert(inferred.contains(df.getOWLClassAssertionAxiom(cls01, indivB)))
+  }
 }