Add tests of EventStreamId

Author: Andreas Gehrke

src/Atc.Cosmos.EventStore.Cqrs/EventStreamId.cs

@@ -31,7 +31,7 @@ public EventStreamId(EventStreamId existing)
     public string Value { get; }
 
     public static implicit operator EventStreamId(StreamId id)
-        => FromStreamId(id.Value);
+        => FromStreamId(id);
 
     public static EventStreamId FromStreamId(StreamId id)
         => new(

test/Atc.Cosmos.EventStore.Cqrs.Tests/EventStreamIdTests.cs

@@ -0,0 +1,45 @@
+using FluentAssertions;
+using Xunit;
+
+namespace Atc.Cosmos.EventStore.Cqrs.Commands.Tests;
+
+public class EventStreamIdTests
+{
+    [Fact]
+    public void Ctor_must_throw_when_no_arguments_are_provided()
+    {
+        Assert.Throws<ArgumentException>(() => new EventStreamId());
+    }
+
+    [Fact]
+    public void Value_property_must_return_joined_parts()
+    {
+        var id = new EventStreamId("foo", "bar");
+        id.Value.Should().Be("foo.bar");
+    }
+
+    [Fact]
+    public void Parts_property_must_return_parts()
+    {
+        var id = new EventStreamId("foo", "bar");
+        id.Parts.Should().BeEquivalentTo("foo", "bar");
+    }
+
+    [Fact]
+    public void EventStreamId_can_be_cloned_using_ctor()
+    {
+        var id = new EventStreamId("foo", "bar");
+        var clone = new EventStreamId(id);
+        id.Value.Should().Be(clone.Value);
+    }
+
+    [Fact]
+    public void EventStreamId_can_be_created_from_StreamId()
+    {
+        var streamId = new StreamId("foo.bar");
+        EventStreamId eventStreamId = streamId;
+        EventStreamId eventStreamId2 = EventStreamId.FromStreamId(streamId);
+        eventStreamId.Value.Should().Be("foo.bar");
+        eventStreamId2.Value.Should().Be("foo.bar");
+    }
+}