feat(core): implement an attribute to set custom event name (#41)

closes #40

src/SecTester.Core/Bus/EventNameAttribute.cs

@@ -0,0 +1,13 @@
+namespace SecTester.Core.Bus;
+
+[System.AttributeUsage(System.AttributeTargets.Class |
+                       System.AttributeTargets.Struct)]
+public class EventNameAttribute : System.Attribute
+{
+  public string Name { get; }
+
+  public EventNameAttribute(string name)
+  {
+    Name = name;
+  }
+}

test/SecTester.Core.Tests/Bus/EventNameAttributeTests.cs

@@ -0,0 +1,28 @@
+using SecTester.Core.Bus;
+
+namespace SecTester.Core.Tests.Bus;
+
+public class EventNameAttributeTests
+{
+  [EventName(name: "custom_name")]
+  private record ConcreteEvent(string Payload) : Event
+  {
+    public string Payload = Payload;
+  }
+
+  [Fact]
+  public void EventNameAttribute_SetsCustomName()
+  {
+    // arrange
+    var info = typeof(ConcreteEvent);
+
+    // act
+    var attribute = info.GetCustomAttributes(typeof(EventNameAttribute), true).FirstOrDefault();
+
+    // assert
+    attribute.Should().BeEquivalentTo(new
+    {
+      Name = "custom_name"
+    });
+  }
+}