I am getting null reference exception in TestRenderer when rendering a component. Maybe someon will help me out from this.

[GunnarPiho]

This is the message I am getting

Message: 
Test method Abc.Tests.Razor.Shared.SmartEhrDetailTests.GetItemTypeTest threw exception:
System.NullReferenceException: Object reference not set to an instance of an object.

Stack Trace: 
RadzenSplitButtonItem.get_ItemClassList()
RadzenSplitButtonItem.BuildRenderTree(RenderTreeBuilder __builder)
ComponentState.RenderIntoBatch(RenderBatchBuilder batchBuilder, RenderFragment renderFragment, Exception& renderFragmentException)
--- End of stack trace from previous location ---
TestRenderer.AssertNoUnhandledExceptions() line 629
TestRenderer.Render[TResult](RenderFragment renderFragment, Func2 activator) line 480 TestRenderer.RenderFragment(RenderFragment renderFragment) line 101 TestContextBaseRenderExtensions.RenderInsideRenderTree(TestContextBase testContext, RenderFragment renderFragment) line 43 TestContextBaseRenderExtensions.RenderInsideRenderTree[TComponent](TestContextBase testContext, RenderFragment renderFragment) line 23 TestContext.Render[TComponent](RenderFragment renderFragment) line 68 TestContext.RenderComponent[TComponent](Action1 parameterBuilder) line 54
SmartEhrDetailTests.GetItemTypeTest() line 148
RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)

The line 148 is ...RenderComponent

[TestMethod] public void GetItemTypeTest() {
    var expected = random<ContactType>();
    var s = ((int)expected).ToString();
    var c = context.RenderComponent<RadzenSplitButtonItem>(p => {
        p.Add(x => x.Value, s);
    });
    var actual = obj.getItemType(c.Instance);
    areEqual(expected, actual);
}

[linkdotnet]

Hey @GunnarPiho

can you show the code of your component under test? The stack trace indicates it comes from the component on its first render cycle.