Adjust test to cover owl:rational case

Author: mdesalvo

RDFSharp.Test/Query/Mirella/Algebra/Expressions/RDFAbsExpressionTest.cs

@@ -86,7 +86,7 @@ public void ShouldApplyExpressionWithVariableAndCalculateResult()
             table.Columns.Add("?A", typeof(string));
             table.Columns.Add("?B", typeof(string));
             DataRow row = table.NewRow();
-            row["?A"] = new RDFTypedLiteral("-5.1", RDFModelEnums.RDFDatatypes.XSD_DOUBLE).ToString();
+            row["?A"] = new RDFTypedLiteral("-11/2", RDFModelEnums.RDFDatatypes.OWL_RATIONAL).ToString();
             row["?B"] = new RDFTypedLiteral("25", RDFModelEnums.RDFDatatypes.XSD_INT).ToString();
             table.Rows.Add(row);
             table.AcceptChanges();
@@ -96,7 +96,7 @@ public void ShouldApplyExpressionWithVariableAndCalculateResult()
             RDFPatternMember expressionResult = expression.ApplyExpression(table.Rows[0]);
 
             Assert.IsNotNull(expressionResult);
-            Assert.IsTrue(expressionResult.Equals(new RDFTypedLiteral("5.1", RDFModelEnums.RDFDatatypes.XSD_DOUBLE)));
+            Assert.IsTrue(expressionResult.Equals(new RDFTypedLiteral("5.5", RDFModelEnums.RDFDatatypes.XSD_DOUBLE)));
         }
 
         [TestMethod]