Add test for OpenPROnGitHub command

Author: jcansdale

src/GitHub.App/SampleData/PullRequestListViewModelDesigner.cs

@@ -34,7 +34,7 @@ public PullRequestListViewModelDesigner()
                 Assignee = new AccountDesigner { Login = "haacked", IsUser = true },
             });
             prs.Add(new PullRequestModel(409, "Fix publish button style and a really, really long name for this thing... OMG look how long this name is yusssss",
-                new AccountDesigner { Login = "shana", IsUser = true },                
+                new AccountDesigner { Login = "shana", IsUser = true },
                 DateTimeOffset.Now - TimeSpan.FromHours(5))
             {
                 CommentCount = 27,
@@ -76,5 +76,6 @@ public PullRequestListViewModelDesigner()
 
         public ReactiveCommand<object> OpenPullRequest { get; }
         public ReactiveCommand<object> CreatePullRequest { get; }
+        public ReactiveCommand<object> OpenPROnGitHub { get; }
     }
 }

src/GitHub.Exports.Reactive/ViewModels/IPullRequestListViewModel.cs

@@ -41,5 +41,6 @@ public interface IPullRequestListViewModel : IViewModel, ICanNavigate, IHasBusy
         IAccount SelectedAssignee { get; set; }
         ReactiveCommand<object> OpenPullRequest { get; }
         ReactiveCommand<object> CreatePullRequest { get; }
+        ReactiveCommand<object> OpenPROnGitHub { get; }
     }
 }

src/UnitTests/GitHub.App/ViewModels/PullRequestListViewModelTests.cs

@@ -7,6 +7,7 @@
 using GitHub.Services;
 using GitHub.Settings;
 using GitHub.ViewModels;
+using GitHub.Primitives;
 using NSubstitute;
 using Xunit;
 
@@ -90,6 +91,23 @@ public void ResettingAuthorToNoneShouldNotTriggerFilter()
             prViewModel.PullRequests.Received(2).Filter = AnyFilter;
         }
 
+        [Theory]
+        [InlineData("https://github.com/owner/repo", 666, "https://github.com/owner/repo/pull/666")]
+        public void OpenPROnGitHubShouldOpenBrowser(string cloneUrl, int pullNumber, string expectUrl)
+        {
+            var repositoryHost = CreateRepositoryHost();
+            var repository = Substitute.For<ILocalRepositoryModel>();
+            var settings = CreateSettings();
+            var browser = Substitute.For<IVisualStudioBrowser>();
+            var prViewModel = new PullRequestListViewModel(repositoryHost, repository, settings, browser);
+            prViewModel.SelectedRepository = Substitute.For<IRemoteRepositoryModel>();
+            prViewModel.SelectedRepository.CloneUrl.Returns(new UriString(cloneUrl));
+
+            prViewModel.OpenPROnGitHub.Execute(pullNumber);
+
+            browser.ReceivedWithAnyArgs(1).OpenUrl(new Uri(expectUrl));
+        }
+
         Func<IPullRequestModel, int, IList<IPullRequestModel>, bool> AnyFilter =>
             Arg.Any<Func<IPullRequestModel, int, IList<IPullRequestModel>, bool>>();