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diff --git a/src/test/scala/buzz/OWLAxiomSpec.scala b/src/test/scala/buzz/OWLAxiomSpec.scala
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+++ b/src/test/scala/buzz/OWLAxiomSpec.scala
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+package rsacomb
+
+import java.util.ArrayList
+import org.scalatest.{FlatSpec, Matchers, LoneElement}
+
+import uk.ac.manchester.cs.owl.owlapi.{OWLSubClassOfAxiomImpl}
+import uk.ac.manchester.cs.owl.owlapi.{OWLClassImpl, OWLObjectSomeValuesFromImpl, OWLObjectIntersectionOfImpl, OWLObjectOneOfImpl, OWLObjectAllValuesFromImpl, OWLObjectMaxCardinalityImpl, OWLNamedIndividualImpl}
+import uk.ac.manchester.cs.owl.owlapi.{OWLObjectPropertyImpl}
+import org.semanticweb.owlapi.model.{OWLAxiom,IRI}
+
+import tech.oxfordsemantic.jrdfox.logic.{Rule,Bind,BuiltinFunctionCall}
+import tech.oxfordsemantic.jrdfox.logic.{Atom, Predicate, Term, Variable, Individual}
+
+object OWLAxiomSpec {
+
+  // IRI
+  val iri_Professor = IRI.create("univ:Professor")
+  val iri_Female    = IRI.create("std:Female")
+  val iri_Student   = IRI.create("univ:Student")
+  val iri_PartTimeStudent = IRI.create("univ:PartTimeStudent")
+  val iri_Worker    = IRI.create("univ:Worker")
+  val iri_alice     = IRI.create("univ:alice")
+  val iri_supervises    = IRI.create("univ:supervises")
+  val iri_hasSupervisor = IRI.create("univ:hasSupervisor")
+  val iri_sameAs = IRI.create("owl:sameAs")
+
+  // RDFox Terms
+  val term_x = Variable.create("x")
+  val term_y = Variable.create("y")
+  val term_z = Variable.create("z")
+  val term_c1 = Individual.create("internal:c_1")
+  val term_c2 = Individual.create("internal:c_2")
+  val term_alice = Individual.create("univ:alice")
+
+  // RDFox Predicates
+  val pred_sameAs = Predicate.create("owl:sameAs")
+  val pred_Professor = Predicate.create(iri_Professor.getIRIString)
+  val pred_hasSupervisor = Predicate.create(iri_hasSupervisor.getIRIString)
+
+  // OWL Classes
+  // Name Class corresponding to
+  //
+  //    Professor
+  //
+  val class_Professor = new OWLClassImpl(iri_Professor)
+  val class_Female    = new OWLClassImpl(iri_Female)
+  val class_Student   = new OWLClassImpl(iri_Student)
+  val class_PartTimeStudent   = new OWLClassImpl(iri_PartTimeStudent)
+  val class_Worker    = new OWLClassImpl(iri_Worker)
+  val class_OWLClass = class_Professor
+  // Class Conjunction corresponding to
+  //
+  //    Student ∧ Worker
+  //
+  val class_OWLObjectIntersectionOf = 
+    new OWLObjectIntersectionOfImpl(
+      class_Student, class_Worker
+    )
+  // Singleton Class corresponding to
+  //
+  //    { alice }
+  //
+  val class_OWLObjectOneOf =
+    new OWLObjectOneOfImpl(
+      new OWLNamedIndividualImpl(iri_alice)
+    )
+  // Object Existential Restiction corresponding to
+  //
+  //    ∃ hasSupervisor.Professor
+  //
+  val class_OWLObjectSomeValuesFrom =
+    new OWLObjectSomeValuesFromImpl(
+      new OWLObjectPropertyImpl(iri_hasSupervisor),
+      class_Professor
+    )
+  // Object Max Cardinality Restriction corresponding to
+  //
+  //    ≤ 1 hasSupervisor . Professor
+  val class_OWLObjectMaxCardinality =
+    new OWLObjectMaxCardinalityImpl(
+      new OWLObjectPropertyImpl(iri_hasSupervisor),
+      1,
+      class_Professor
+    )
+
+  // OWL Axioms
+  // Axiom SubClassOf corresponding to
+  //
+  //    Student ∧ Worker -> PartTimeStudent
+  //
+  val axiom_OWLSubClassOf1 = 
+    new OWLSubClassOfAxiomImpl(
+      class_OWLObjectIntersectionOf,
+      class_PartTimeStudent,
+      new ArrayList()
+    )
+
+  // Axiom SubClassOf corresponding to
+  //
+  //    Student -> ∃ hasSupervisor.Professor
+  //
+  val axiom_OWLSubClassOf2 =
+    new OWLSubClassOfAxiomImpl(
+      class_Student,
+      class_OWLObjectSomeValuesFrom,
+      new ArrayList()
+    )
+
+  // Axiom SubClassOf corresponding to
+  //
+  //    ∃ hasSupervisor.Professor -> Student
+  //
+  val axiom_OWLSubClassOf3 =
+    new OWLSubClassOfAxiomImpl(
+      class_OWLObjectSomeValuesFrom,
+      class_Student,
+      new ArrayList()
+    )
+
+  // Axiom SubClassOf corresponding to
+  //
+  //    Student -> { alice }
+  //
+  val axiom_OWLSubClassOf4 =
+    new OWLSubClassOfAxiomImpl(
+      class_Student,
+      class_OWLObjectOneOf,
+      new ArrayList()
+    )
+
+  // Axiom SubClassOf corresponding to
+  //
+  //    Student -> ≤1 hasSupervisor.Professor
+  //
+  val axiom_OWLSubClassOf5 =
+    new OWLSubClassOfAxiomImpl(
+      class_Student,
+      class_OWLObjectMaxCardinality,
+      new ArrayList()
+    )
+
+  def convertAxiom(
+    axiom: OWLAxiom,
+    term: Term,
+    skolem: SkolemStrategy = SkolemStrategy.None
+  ) : List[Rule] = {
+    axiom.accept(RDFoxAxiomConverter(term,skolem))
+  }
+
+} // object OWLAxiomSpec
+
+class OWLAxiomSpec
+  extends FlatSpec with Matchers with LoneElement
+{
+  // Import required data
+  import OWLAxiomSpec._
+
+  // OWLSubClassOfAxiom #1
+  axiom_OWLSubClassOf1.toString should "be converted into a singleton List[Rule]" in {
+    val result = convertAxiom(axiom_OWLSubClassOf1,term_x)
+    result.loneElement shouldBe a [Rule]
+  }
+
+  it should "contain a conjuction of atoms (Student[?x],Worker[?x]) in the body of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf1,term_x)
+    val body = List(
+      Atom.create(Predicate.create(iri_Student.getIRIString),term_x),
+      Atom.create(Predicate.create(iri_Worker.getIRIString),term_x)
+    )
+    result.loneElement.getBody should contain theSameElementsAs body
+  }
+
+  it should "contain a single atom (PartTimeStudent[?x]) in the head of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf1,term_x)
+    val head = Atom.create(Predicate.create(iri_PartTimeStudent.getIRIString),term_x)
+    result.loneElement.getHead.loneElement should be (head)
+  }
+
+  // OWLSubClassOfAxiom #2 (w/ constant skolemization)
+  (axiom_OWLSubClassOf2.toString + "\n(w/ constant skolemization)") should
+    "be converted into a singleton List[Rule]" in
+  {
+    val skolem = SkolemStrategy.Constant(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2,term_x,skolem)
+    result.loneElement shouldBe a [Rule]
+  }
+
+  it should "contain a single atom (Student[?x]) in the body of the rule" in {
+    val skolem = SkolemStrategy.Constant(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2,term_x,skolem)
+    val body = Atom.create(Predicate.create(iri_Student.getIRIString),term_x)
+    result.loneElement.getBody.loneElement should equal (body)
+  }
+
+  it should "contain a conjuction of atoms (hasSupervisor[?x,?c],Professor[?c]) in the head of the rule" in {
+    val skolem = SkolemStrategy.Constant(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2,term_x,skolem)
+    val term_c = Individual.create(skolem.const)
+    val head = List(
+      Atom.create(Predicate.create(iri_hasSupervisor.getIRIString),term_x,term_c),
+      Atom.create(Predicate.create(iri_Professor.getIRIString),term_c)
+    )
+    result.loneElement.getHead should contain theSameElementsAs (head)
+  }
+
+  // OWLSubClassOfAxiom #2 (w/ skolemization)
+  (axiom_OWLSubClassOf2.toString + "\n(w/ skolemization)") should
+    "be converted into a singleton List[Rule]" in
+  {
+    val skolem = SkolemStrategy.Standard(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2, term_x, skolem)
+    result.loneElement shouldBe a [Rule]
+  }
+
+  it should "contain an atom (Student[?x]) in the body of the rule" in {
+    val skolem = SkolemStrategy.Standard(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2, term_x, skolem)
+    val body = Atom.create(Predicate.create(iri_Student.getIRIString),term_x)
+    result.loneElement.getBody should contain (body)
+  }
+
+  it should "contain a built-in function call (BIND(?y,SKOLEM(?f,?x))) in the body of the rule" in {
+    val skolem = SkolemStrategy.Standard(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2, term_x, skolem)
+    val call = Bind.create(BuiltinFunctionCall.create("SKOLEM",term_x),term_y)
+    result.loneElement.getBody should contain (call)
+  }
+
+  it should "contain a conjuction of atom (hasSupervisor[?x,?y],Professor[?y]) in the head of the rule" in {
+    val skolem = SkolemStrategy.Standard(axiom_OWLSubClassOf2.toString)
+    val result = convertAxiom(axiom_OWLSubClassOf2, term_x, skolem)
+    val head = List(
+      Atom.create(Predicate.create(iri_hasSupervisor.getIRIString),term_x,term_y),
+      Atom.create(Predicate.create(iri_Professor.getIRIString),term_y)
+    )
+    result.loneElement.getHead should contain theSameElementsAs head
+  }
+
+  // OWLSubClassOfAxiom #3
+  axiom_OWLSubClassOf3.toString should "be converted into a singleton List[Rule]" in {
+    val result = convertAxiom(axiom_OWLSubClassOf3,term_x)
+    result.loneElement shouldBe a [Rule]
+  }
+
+  it should "contain a conjunction of atoms (hasSupervisor[?x,?y],Professor[?y]) in the body of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf3,term_x)
+    val body = List(
+      Atom.create(Predicate.create(iri_hasSupervisor.getIRIString),term_x,term_y),
+      Atom.create(Predicate.create(iri_Professor.getIRIString),term_y)
+    )
+    result.loneElement.getBody should contain theSameElementsAs body
+  }
+
+  it should "contain a single atom (Student[?x]) in the head of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf3, term_x)
+    val head = Atom.create(Predicate.create(iri_Student.getIRIString),term_x)
+    result.loneElement.getHead.loneElement should be (head)
+  }
+
+  // OWLSubClassOfAxiom #4
+  axiom_OWLSubClassOf4.toString should "be converted into a singleton List[Rule]" in {
+    val result = convertAxiom(axiom_OWLSubClassOf4,term_x)
+    result.loneElement shouldBe a [Rule]
+  }
+
+  it should "contain a single atoms (Student[?x]) in the body of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf4,term_x)
+    val body = Atom.create(Predicate.create(iri_Student.getIRIString),term_x)
+    result.loneElement.getBody.loneElement should be (body)
+  }
+
+  it should "contain a single atom (sameAs[?x,alice])) in the head of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf4, term_x)
+    val head = Atom.create(Predicate.create(iri_sameAs.getIRIString),term_x,term_alice)
+    result.loneElement.getHead.loneElement should be (head)
+  }
+
+  // OWLSubClassOfAxiom #5
+  axiom_OWLSubClassOf5.toString should "be converted into a singleton List[Rule]" in {
+    val result = convertAxiom(axiom_OWLSubClassOf5,term_x)
+    result.loneElement shouldBe a [Rule]
+  }
+
+  it should "contain a conjunction of atoms (...) in the body of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf5,term_x)
+    val body = List(
+      Atom.create(Predicate.create(iri_Student.getIRIString),term_x),
+      Atom.create(Predicate.create(iri_hasSupervisor.getIRIString),term_x,term_y),
+      Atom.create(Predicate.create(iri_Professor.getIRIString),term_y),
+      Atom.create(Predicate.create(iri_hasSupervisor.getIRIString),term_x,term_z),
+      Atom.create(Predicate.create(iri_Professor.getIRIString),term_z)
+    )
+    result.loneElement.getBody should contain theSameElementsAs body
+  }
+
+  it should "contain a single atom (sameAs[?x,?z])) in the head of the rule" in {
+    val result = convertAxiom(axiom_OWLSubClassOf5, term_x)
+    val head = Atom.create(Predicate.create(iri_sameAs.getIRIString),term_y,term_z)
+    result.loneElement.getHead.loneElement should be (head)
+  }
+
+} // class OWLAxiomSpec