Implement Connection tests (#175)

Author: kblok

lib/PuppeteerSharp.Tests/Connection/ConnectionTests.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace PuppeteerSharp.Tests.Frame
+{
+    [Collection("PuppeteerLoaderFixture collection")]
+    public class ConnectionTests : PuppeteerPageBaseTest
+    {
+        [Fact]
+        public async Task ShouldThrowNiceErrors()
+        {
+            var exception = await Assert.ThrowsAsync<MessageException>(async () =>
+            {
+                await TheSourceOfTheProblems();
+            });
+            Assert.Contains("TheSourceOfTheProblems", exception.StackTrace);
+            Assert.Contains("ThisCommand.DoesNotExist", exception.Message);
+        }
+
+        private async Task TheSourceOfTheProblems()
+        {
+            await Page.Client.SendAsync("ThisCommand.DoesNotExist");
+        }
+    }
+}