Add unit test for NpgmqClient constructor with connection string

Npgmq.Test/NpgmqClientTest.cs

@@ -56,6 +56,22 @@ private async Task<bool> IsMinPgmqVersion(string minVersion)
         return version is not null && new Version(version) >= new Version(minVersion);
     }
 
+    [Fact]
+    public async Task NpgmqClient_should_work_when_created_using_a_connection_string()
+    {
+        // Arrange
+        await ResetTestQueueAsync();
+        var sut = new NpgmqClient(_connectionString); // Don't use _sut here, as we want to test a new instance
+
+        // Act
+        await sut.SendAsync(TestQueueName, new TestMessage { Foo = 123 });
+        var msg = await sut.ReadAsync<TestMessage>(TestQueueName);
+
+        // Assert
+        Assert.NotNull(msg);
+        msg.Message.ShouldDeepEqual(new TestMessage { Foo = 123 });
+    }
+
     [Fact]
     public async Task ArchiveAsync_should_archive_a_single_message()
     {

Npgmq/NpgmqClient.cs

@@ -16,7 +16,7 @@ public class NpgmqClient : INpgmqClient
     private readonly NpgmqCommandFactory _commandFactory;
 
     /// <summary>
-    /// Create a new <see cref="NpgmqClient"/>.
+    /// Create a new <see cref="NpgmqClient"/> using a connection string.
     /// </summary>
     /// <param name="connectionString">The connection string.</param>
     public NpgmqClient(string connectionString)
@@ -25,7 +25,7 @@ public NpgmqClient(string connectionString)
     }
 
     /// <summary>
-    /// Create a new <see cref="NpgmqClient"/>.
+    /// Create a new <see cref="NpgmqClient"/> using an existing <see cref="NpgsqlConnection"/>.
     /// </summary>
     /// <param name="connection">The connection to use.</param>
     public NpgmqClient(NpgsqlConnection connection)