Moved analyzer tests to its own project

Also moves tests to `./test` which makes it possible
for all test projects to share the same .editorconfig
files and similar.

test/Spectre.Console.Tests/Unit/Cli/CommandAppTests.Injection.cs

@@ -0,0 +1,67 @@
+using Shouldly;
+using Spectre.Console.Testing;
+using Spectre.Console.Tests.Data;
+using Xunit;
+using Spectre.Console.Cli;
+
+namespace Spectre.Console.Tests.Unit.Cli
+{
+    public sealed partial class CommandAppTests
+    {
+        public sealed class Injection
+        {
+            public sealed class FakeDependency
+            {
+            }
+
+            public sealed class InjectSettings : CommandSettings
+            {
+                public FakeDependency Fake { get; set; }
+
+                [CommandOption("--name <NAME>")]
+                public string Name { get; }
+
+                [CommandOption("--age <AGE>")]
+                public int Age { get; set; }
+
+                public InjectSettings(FakeDependency fake, string name)
+                {
+                    Fake = fake;
+                    Name = "Hello " + name;
+                }
+            }
+
+            [Fact]
+            public void Should_Inject_Parameters()
+            {
+                // Given
+                var app = new CommandAppTester();
+                var dependency = new FakeDependency();
+
+                app.SetDefaultCommand<GenericCommand<InjectSettings>>();
+                app.Configure(config =>
+                {
+                    config.Settings.Registrar.RegisterInstance(dependency);
+                    config.PropagateExceptions();
+                });
+
+                // When
+                var result = app.Run(new[]
+                {
+                    "--name", "foo",
+                    "--age", "35",
+                });
+
+                // Then
+                result.ExitCode.ShouldBe(0);
+                result.Settings.ShouldBeOfType<InjectSettings>().And(injected =>
+                {
+                    injected.ShouldNotBeNull();
+                    injected.Fake.ShouldBeSameAs(dependency);
+                    injected.Name.ShouldBe("Hello foo");
+                    injected.Age.ShouldBe(35);
+                });
+            }
+        }
+    }
+}