diff --git a/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/StandaloneAppTest.cs b/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/StandaloneAppTest.cs
index 05129d9937..217fdaaba5 100644
--- a/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/StandaloneAppTest.cs
+++ b/test/Microsoft.AspNetCore.Blazor.E2ETest/Tests/StandaloneAppTest.cs
@@ -6,6 +6,7 @@ using Microsoft.AspNetCore.Blazor.E2ETest.Infrastructure.ServerFixtures;
 using OpenQA.Selenium;
 using OpenQA.Selenium.Support.UI;
 using System;
+using System.Linq;
 using Xunit;
 
 namespace Microsoft.AspNetCore.Blazor.E2ETest.Tests
@@ -71,6 +72,47 @@ namespace Microsoft.AspNetCore.Blazor.E2ETest.Tests
                 item => Assert.Equal("Home", item.Text));
         }
 
+        [Fact]
+        public void HasCounterPage()
+        {
+            // Navigate to "Counter"
+            Browser.FindElement(By.LinkText("Counter")).Click();
+            Assert.Equal("Counter", Browser.FindElement(By.TagName("h1")).Text);
+
+            // Observe the initial value is zero
+            var countDisplayElement = Browser.FindElement(By.CssSelector("h1 + p"));
+            Assert.Equal("Current count: 0", countDisplayElement.Text);
+
+            // Click the button; see it counts
+            var button = Browser.FindElement(By.CssSelector(".col-sm-9 button"));
+            button.Click();
+            button.Click();
+            button.Click();
+            Assert.Equal("Current count: 3", countDisplayElement.Text);
+        }
+
+        [Fact]
+        public void HasFetchDataPage()
+        {
+            // Navigate to "Counter"
+            Browser.FindElement(By.LinkText("Fetch data")).Click();
+            Assert.Equal("Weather forecast", Browser.FindElement(By.TagName("h1")).Text);
+
+            // Wait until loaded
+            var tableSelector = By.CssSelector("table.table");
+            new WebDriverWait(Browser, TimeSpan.FromSeconds(10)).Until(
+                driver => driver.FindElement(tableSelector) != null);
+
+            // Check the table is displayed correctly
+            var rows = Browser.FindElements(By.CssSelector("table.table tbody tr"));
+            Assert.Equal(5, rows.Count);
+            var cells = rows.SelectMany(row => row.FindElements(By.TagName("td")));
+            foreach (var cell in cells)
+            {
+                Assert.True(!string.IsNullOrEmpty(cell.Text));
+            }
+        }
+
         private void WaitUntilLoaded()
         {
             new WebDriverWait(Browser, TimeSpan.FromSeconds(30)).Until(
diff --git a/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs b/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs
new file mode 100644
index 0000000000..b7377cb426
--- /dev/null
+++ b/test/Microsoft.AspNetCore.Blazor.Test/JsonUtilTest.cs
@@ -0,0 +1,80 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using Xunit;
+
+namespace Microsoft.AspNetCore.Blazor.Test
+{
+    public class JsonUtilTest
+    {
+        // It's not useful to have a complete set of behavior specifications for
+        // what the JSON serializer/deserializer does in all cases here. We merely
+        // expose a simple wrapper over a third-party library that maintains its
+        // own specs and tests.
+        //
+        // We should only add tests here to cover behaviors that Blazor itself
+        // depends on.
+
+        [Theory]
+        [InlineData(null, "null")]
+        [InlineData("My string", "\"My string\"")]
+        [InlineData(123, "123")]
+        [InlineData(123.456f, "123.456")]
+        [InlineData(123.456d, "123.456")]
+        [InlineData(true, "true")]
+        public void CanSerializePrimitivesToJson(object value, string expectedJson)
+        {
+            Assert.Equal(expectedJson, JsonUtil.Serialize(value));
+        }
+
+        [Theory]
+        [InlineData("null", null)]
+        [InlineData("\"My string\"", "My string")]
+        [InlineData("123", 123L)] // Would also accept 123 as a System.Int32, but Int64 is fine as a default
+        [InlineData("123.456", 123.456d)]
+        [InlineData("true", true)]
+        public void CanDeserializePrimitivesFromJson(string json, object expectedValue)
+        {
+            Assert.Equal(expectedValue, JsonUtil.Deserialize<object>(json));
+        }
+
+        [Fact]
+        public void CanSerializeClassToJson()
+        {
+            // Arrange
+            var person = new Person
+            {
+                Id = 1844,
+                Name = "Athos",
+                Pets = new[] { "Aramis", "Porthos", "D'Artagnan" }
+            };
+
+            // Act/Assert
+            Assert.Equal(
+                "{\"Id\":1844,\"Name\":\"Athos\",\"Pets\":[\"Aramis\",\"Porthos\",\"D'Artagnan\"]}",
+                JsonUtil.Serialize(person));
+        }
+
+        [Fact]
+        public void CanDeserializeClassFromJson()
+        {
+            // Arrange
+            var json = "{\"Id\":1844,\"Name\":\"Athos\",\"Pets\":[\"Aramis\",\"Porthos\",\"D'Artagnan\"]}";
+
+            // Act
+            var person = JsonUtil.Deserialize<Person>(json);
+
+            // Assert
+            Assert.Equal(1844, person.Id);
+            Assert.Equal("Athos", person.Name);
+            Assert.Equal(new[] { "Aramis", "Porthos", "D'Artagnan" }, person.Pets);
+        }
+
+        class Person
+        {
+            public int Id { get; set; }
+            public string Name { get; set; }
+            public string[] Pets { get; set; }
+        }
+    }
+}