Property keyed projection tests

Tests/ProjectionsTests/PropertyKeyedProjectionTests.cs

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+// Copyright (c) Dolittle. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+using Dolittle.SDK.Events;
+using Dolittle.SDK.Testing.Projections;
+using FluentAssertions;
+using Xunit;
+
+namespace Dolittle.SDK.Projections;
+
+[EventType("215ecbf9-cfe8-4656-84c5-5f6302ef6cd3")]
+public record AnEvent(string TheProperty, string TheValue);
+
+[EventType("7c85e7c3-aff4-42f4-b577-d70000b636c6")]
+public record ADeleteEvent(string TheProperty);
+
+[Projection("f850fb88-2f09-45ca-a987-94b7fbb115a5")]
+public class PropertyKeyedProjection : ReadModel
+{
+    public string TheValue { get; set; }
+
+    [KeyFromProperty(nameof(AnEvent.TheProperty))]
+    public void On(AnEvent evt)
+    {
+        TheValue = evt.TheValue;
+    }
+
+    [KeyFromProperty(nameof(AnEvent.TheProperty))]
+    public ProjectionResultType On(ADeleteEvent evt) => ProjectionResultType.Delete;
+}
+
+public class PropertyKeyedProjectionTests : ProjectionTests<PropertyKeyedProjection>
+{
+    const string EventSource = "Foo";
+    const string Property = "TheProperty";
+
+    [Fact]
+    public void CanProjectOnProperty()
+    {
+        WithEvent(EventSource, new AnEvent(Property, "42"));
+
+        ReadModel(Property).TheValue.Should().Be("42");
+    }
+
+    [Fact]
+    public void CanProjectDeleteOnProperty()
+    {
+        WithEvent(EventSource, new AnEvent(Property, "42"));
+        WithEvent(EventSource, new ADeleteEvent(Property));
+
+        ReadModelShouldBeDeleted(Property);
+    }
+}