Add tests

samples/IntegrationTestApp/MainWindow.axaml

@@ -56,6 +56,16 @@
         </StackPanel>
       </TabItem>
 
+      <TabItem Header="RadioButton">
+        <StackPanel Orientation="Vertical">
+          <RadioButton Name="BasicRadioButton">Sample RadioButton</RadioButton>
+          <StackPanel Orientation="Vertical">
+            <RadioButton Name="ThreeStatesRadioButton1" IsChecked="True" IsThreeState="True">Three States: Option 1</RadioButton>
+            <RadioButton Name="ThreeStatesRadioButton2" IsChecked="False" IsThreeState="True">Three States: Option 2</RadioButton>
+          </StackPanel>
+        </StackPanel>
+      </TabItem>
+      
       <TabItem Header="CheckBox">
         <StackPanel>
           <CheckBox Name="UncheckedCheckBox">Unchecked</CheckBox>

tests/Avalonia.IntegrationTests.Appium/RadioButtonTests.cs

@@ -0,0 +1,48 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using OpenQA.Selenium.Appium;
+using Xunit;
+
+namespace Avalonia.IntegrationTests.Appium
+{
+    [Collection("Default")]
+    public class RadioButtonTests
+    {
+        private readonly AppiumDriver<AppiumWebElement> _session;
+
+        public RadioButtonTests(TestAppFixture fixture)
+        {
+            _session = fixture.Session;
+
+            var tabs = _session.FindElementByAccessibilityId("MainTabs");
+            tabs.FindElementByName("RadioButton").Click();
+        }
+
+
+        [Fact]
+        public void RadioButton_IsChecked_True_When_Clicked()
+        {
+            var button = _session.FindElementByAccessibilityId("BasicRadioButton");
+            Assert.False(button.GetIsChecked());
+            button.Click();
+            Assert.True(button.GetIsChecked());
+        }
+
+        [Fact]
+        public void ThreeState_RadioButton_IsChecked_False_When_Other_ThreeState_RadioButton_Checked()
+        {
+            var button1 = _session.FindElementByAccessibilityId("ThreeStatesRadioButton1");
+            var button2 = _session.FindElementByAccessibilityId("ThreeStatesRadioButton2");
+            Assert.True(button1.GetIsChecked());
+            Assert.False(button2.GetIsChecked());
+            button2.Click();
+            Assert.False(button1.GetIsChecked());
+            Assert.True(button2.GetIsChecked());
+        }
+
+    }
+}