Merge pull request #677 from tig/scenario_tests

Adds unit test that executes every Scenario in UI Catalog

UICatalog/Scenario.cs

@@ -227,7 +227,7 @@ namespace UICatalog {
 		/// Returns an instance of each <see cref="Scenario"/> defined in the project. 
 		/// https://stackoverflow.com/questions/5411694/get-all-inherited-classes-of-an-abstract-class
 		/// </summary>
-		internal static List<Type> GetDerivedClasses<T> ()
+		public static List<Type> GetDerivedClasses<T> ()
 		{
 			List<Type> objects = new List<Type> ();
 			foreach (Type type in typeof (T).Assembly.GetTypes ()

UnitTests/ScenarioTests.cs

@@ -0,0 +1,65 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Terminal.Gui;
+using UICatalog;
+using Xunit;
+
+// Alais Console to MockConsole so we don't accidentally use Console
+using Console = Terminal.Gui.FakeConsole;
+
+namespace Terminal.Gui {
+	public class ScenarioTests {
+		int CreateInput (string input)
+		{
+			// Put a control-q in at the end
+			Console.MockKeyPresses.Push (new ConsoleKeyInfo ('q', ConsoleKey.Q, shift: false, alt: false, control: true));
+			foreach (var c in input.Reverse ()) {
+				if (char.IsLetter (c)) {
+					Console.MockKeyPresses.Push (new ConsoleKeyInfo (char.ToLower (c), (ConsoleKey)char.ToUpper (c), shift: char.IsUpper (c), alt: false, control: false));
+				} else {
+					Console.MockKeyPresses.Push (new ConsoleKeyInfo (c, (ConsoleKey)c, shift: false, alt: false, control: false));
+				}
+			}
+			return Console.MockKeyPresses.Count;
+		}
+
+		/// <summary>
+		/// This runs through all Sceanrios defined in UI Catalog, calling Init, Setup, and Run.
+		/// It puts a Ctrl-Q in the input queue so the Scenario immediately exits. 
+		/// Should find any egregious regressions.
+		/// </summary>
+		[Fact]
+		public void Run_All_Sceanrios ()
+		{
+			List<Type> scenarioClasses = Scenario.GetDerivedClasses<Scenario> ();
+			Assert.NotEmpty (scenarioClasses);
+
+			foreach (var scenarioClass in scenarioClasses) {
+				// Setup some fake kepresses 
+				// Passing empty string will cause just a ctrl-q to be fired
+				int stackSize = CreateInput ("");
+				int iterations = 0;
+				Application.Iteration = () => {
+					iterations++;
+					// Stop if we run out of control...
+					if (iterations > 10) {
+						Application.RequestStop ();
+					}
+				};
+				Application.Init (new FakeDriver (), new NetMainLoop (() => FakeConsole.ReadKey (true)));
+
+				var scenario = (Scenario)Activator.CreateInstance (scenarioClass);
+				scenario.Init (Application.Top, Colors.Base);
+				scenario.Setup ();
+				scenario.Run ();
+
+				Application.Shutdown ();
+
+				// # of key up events should match # of iterations
+				Assert.Equal (1, iterations);
+				Assert.Equal (stackSize, iterations);
+			}
+		}
+	}
+}