#17 fix

appveyor.yml

@@ -1,7 +1,7 @@
-version: 1.0.4
+version: 1.0.5
 
 environment:
-  nugetVersion: 1.0.4
+  nugetVersion: 1.0.5
 
 init:
   - ps: Update-AppveyorBuild -Version $env:nugetVersion
@@ -35,6 +35,6 @@ for:
   branches:
       only:
         - develop
-  version: 1.0.4-beta{build}
+  version: 1.0.6-beta{build}
   environment:
-    nugetVersion: 1.0.4-beta$(APPVEYOR_BUILD_NUMBER)
+    nugetVersion: 1.0.6-beta$(APPVEYOR_BUILD_NUMBER)

src/Core/AllureNUnitHelper.cs

@@ -231,14 +231,15 @@ private void StopTestCase()
         {
             UpdateTestDataFromAttributes();
             for (var i = 0; i < _test.Arguments.Length; i++)
+            {
                 AllureLifecycle.UpdateTestCase(x => x.parameters.Add(new Parameter
                 {
                     // ReSharper disable once AccessToModifiedClosure
                     name = $"Param #{i}",
-                    // ReSharper disable once AccessToModifiedClosure
-                    value = _test.Arguments[i].ToString()
+                    // ReSharper disable once AccessToModifiedClosure                   
+                    value = _test.Arguments[i] == null ? "NULL" : _test.Arguments[i].ToString()
                 }));
-
+            }
 
             AllureLifecycle.UpdateTestCase(x => x.statusDetails = new StatusDetails
             {

src/TestSamples/TestClass7.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Threading;
+using NUnit.Allure.Attributes;
 using NUnit.Allure.Core;
 using NUnit.Framework;
 
@@ -50,5 +51,15 @@ public void Test2()
         {
             Console.WriteLine("Test2");
         }
+
+        [Test, Combinatorial]
+        [AllureLink("https://github.com/unickq/allure-nunit/issues/17")]
+        public void TestExample(
+            [Range(1, 3)] int valA,
+            [Values(null, 2)] int? valB
+        )
+        {
+            Assert.AreEqual(valA, valB);
+        }
     }
 }