Add status support

src/Spectre.Console.Tests/Tools/DummySpinners.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+
+namespace Spectre.Console.Tests
+{
+    public sealed class DummySpinner1 : Spinner
+    {
+        public override TimeSpan Interval => TimeSpan.FromMilliseconds(100);
+        public override bool IsUnicode => true;
+        public override IReadOnlyList<string> Frames => new List<string>
+            {
+                    "*",
+            };
+    }
+
+    public sealed class DummySpinner2 : Spinner
+    {
+        public override TimeSpan Interval => TimeSpan.FromMilliseconds(100);
+        public override bool IsUnicode => true;
+        public override IReadOnlyList<string> Frames => new List<string>
+            {
+                    "-",
+            };
+    }
+}

src/Spectre.Console.Tests/Unit/StatusTests.cs

@@ -0,0 +1,42 @@
+using Shouldly;
+using Xunit;
+
+namespace Spectre.Console.Tests.Unit
+{
+    public sealed partial class StatusTests
+    {
+        [Fact]
+        public void Should_Render_Status_Correctly()
+        {
+            // Given
+            var console = new TestableAnsiConsole(ColorSystem.TrueColor, width: 10);
+
+            var status = new Status(console);
+            status.AutoRefresh = false;
+            status.Spinner = new DummySpinner1();
+
+            // When
+            status.Start("foo", ctx =>
+            {
+                ctx.Refresh();
+                ctx.Spinner(new DummySpinner2());
+                ctx.Status("bar");
+                ctx.Refresh();
+                ctx.Spinner(new DummySpinner1());
+                ctx.Status("baz");
+            });
+
+            // Then
+            console.Output
+                .NormalizeLineEndings()
+                .ShouldBe(
+                    "[?25l     \n" +
+                    "* foo\n" +
+                    "          \n" +
+                    "- bar\n" +
+                    "          \n" +
+                    "* baz\n" +
+                    "     [?25h");
+        }
+    }
+}