Ensure TestFixture attribute added

GraalGmapGeneratorTests/GmapBuilderTests.cs

@@ -3,6 +3,7 @@ using NUnit.Framework;
 
 namespace GraalGmapGeneratorTests
 {
+    [TestFixture]
     public class GmapBuilderTests
     {
         GmapBuilder gmapBuilder;

GraalGmapGeneratorTests/GmapContentGeneratorTests.cs

@@ -8,6 +8,7 @@ using System.Text.RegularExpressions;
 
 namespace GraalGmapGeneratorTests
 {
+    [TestFixture]
     public class GmapContentGeneratorTests
     {
         [Test]

GraalGmapGeneratorTests/GmapPropertyValidatorsTests.cs

@@ -1,6 +1,4 @@
-using System;
 using System.Collections.Generic;
-using System.Linq;
 using GraalGmapGenerator;
 using NUnit.Framework;
 
@@ -72,7 +70,5 @@ namespace GraalGmapGeneratorTests
         {
             Assert.True(GmapPropertyValidators.IsValidDirectory(validPath));
         }
-
-        
     }
 }

GraalGmapGeneratorTests/GmapTests.cs

@@ -3,6 +3,7 @@ using NUnit.Framework;
 
 namespace GraalGmapGeneratorTests
 {
+    [TestFixture]
     public class GmapTests
     {
         [Test]