Implemented Frame.evaluate tests (#153)

Author: Meir017

lib/PuppeteerSharp.Tests/Frame/EvaluateTests.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Xunit;
+
+namespace PuppeteerSharp.Tests.Frame
+{
+    [Collection("PuppeteerLoaderFixture collection")]
+    public class EvaluateTests : PuppeteerPageBaseTest
+    {
+        [Fact]
+        public async Task ShouldHaveDifferentExecutionContexts()
+        {
+            await Page.GoToAsync(TestConstants.EmptyPage);
+            await FrameUtils.AttachFrame(Page, "frame1", TestConstants.EmptyPage);
+            Assert.Equal(2, Page.Frames.Count());
+
+            var frame1 = Page.Frames.ElementAt(0);
+            var frame2 = Page.Frames.ElementAt(1);
+
+            await frame1.EvaluateExpressionAsync("window.FOO = 'foo'");
+            await frame2.EvaluateExpressionAsync("window.FOO = 'bar'");
+
+            Assert.Equal("foo", await frame1.EvaluateExpressionAsync<string>("window.FOO"));
+            Assert.Equal("bar", await frame2.EvaluateExpressionAsync<string>("window.FOO"));
+        }
+
+        [Fact]
+        public async Task ShouldExecuteAfterCrossSiteNavigation()
+        {
+            await Page.GoToAsync(TestConstants.EmptyPage);
+            var mainFrame = Page.MainFrame;
+            Assert.Contains("localhost", await mainFrame.EvaluateExpressionAsync<string>("window.location.href"));
+
+            await Page.GoToAsync(TestConstants.CrossProcessHttpPrefix + "/empty.html");
+            Assert.Contains("127", await mainFrame.EvaluateExpressionAsync<string>("window.location.href"));
+        }
+    }
+}

lib/PuppeteerSharp.Tests/FrameUtils.cs

@@ -17,7 +17,7 @@ await page.EvaluateFunctionAsync(@"(frameId, url) => {
             }", frameId, url);
         }
 
-        public static string DumpFrames(Frame frame, string indentation = "")
+        public static string DumpFrames(PuppeteerSharp.Frame frame, string indentation = "")
         {
             var result = indentation + Regex.Replace(frame.Url, @":\d{4}", ":<PORT>");
             foreach (var child in frame.ChildFrames)