Tests: disable 3 tests not supported in .Net Core 1.1

src/UnitTests/ComplexTests/Complex32Test.TextHandling.cs

@@ -247,6 +247,7 @@ namespace MathNet.Numerics.UnitTests.ComplexTests
             Assert.AreEqual(float.MinValue, z.Imaginary, "E3");
         }
 
+#if !NETCOREAPP1_1
         /// <summary>
         /// Try parse can handle symbols with a culture.
         /// </summary>
@@ -291,6 +292,7 @@ namespace MathNet.Numerics.UnitTests.ComplexTests
             Assert.AreEqual(float.MaxValue, z.Real, "E2");
             Assert.AreEqual(float.MinValue, z.Imaginary, "E3");
         }
+#endif
 
         /// <summary>
         /// Try parse returns false when given bad value with invariant.

src/UnitTests/ComplexTests/ComplexTest.TextHandling.cs

@@ -150,6 +150,7 @@ namespace MathNet.Numerics.UnitTests.ComplexTests
             Assert.AreEqual(double.MinValue, z.Imaginary, "E3");
         }
 
+#if !NETCOREAPP1_1
         /// <summary>
         /// Try parse can handle symbols with a culture.
         /// </summary>
@@ -196,6 +197,7 @@ namespace MathNet.Numerics.UnitTests.ComplexTests
             Assert.AreEqual(double.MaxValue, z.Real, "E2");
             Assert.AreEqual(double.MinValue, z.Imaginary, "E3");
         }
+#endif
 
         /// <summary>
         /// Try parse returns <c>false</c> when given bad value with invariant.

src/UnitTests/Random/RandomSerializationTests.cs

@@ -27,17 +27,16 @@
 // OTHER DEALINGS IN THE SOFTWARE.
 // </copyright>
 
+#if !NETCOREAPP1_1
+
 using System;
 using System.IO;
 using System.Linq;
 using System.Runtime.Serialization;
+using System.Runtime.Serialization.Formatters.Binary;
 using MathNet.Numerics.Random;
 using NUnit.Framework;
 
-#if !NETCOREAPP1_1
-using System.Runtime.Serialization.Formatters.Binary;
-#endif
-
 namespace MathNet.Numerics.UnitTests.Random
 {
     [TestFixture]
@@ -70,7 +69,6 @@ namespace MathNet.Numerics.UnitTests.Random
             Assert.That(actual.NextDoubleSequence().Take(10).ToArray(), Is.EqualTo(expected.NextDoubleSequence().Take(10).ToArray()).AsCollection);
         }
 
-#if !NETCOREAPP1_1
         [Test]
         [TestCase(typeof(MersenneTwister))]
         [TestCase(typeof(Mcg59))]
@@ -97,6 +95,7 @@ namespace MathNet.Numerics.UnitTests.Random
             Assert.That(actual.GetType(), Is.EqualTo(randomType));
             Assert.That(actual.NextDoubleSequence().Take(10).ToArray(), Is.EqualTo(expected.NextDoubleSequence().Take(10).ToArray()).AsCollection);
         }
-#endif
     }
 }
+
+#endif