tested table creation

src/Blumchen/IDictionaryExtensions.cs

@@ -1,6 +1,3 @@
-using System.Collections;
-using Blumchen.Subscriber;
-
 namespace Blumchen;
 
 internal static class IDictionaryExtensions

src/UnitTests/UnitTests.csproj

@@ -7,6 +7,7 @@
   </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="FsCheck.Xunit" Version="2.16.6" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
         <PackageReference Include="NSubstitute" Version="5.1.0" />
         <PackageReference Include="NSubstitute.Analyzers.CSharp" Version="1.0.17">

src/UnitTests/message_table_creation.cs

@@ -0,0 +1,51 @@
+using Blumchen;
+using FsCheck.Xunit;
+
+namespace UnitTests
+{
+    public class message_table_creation
+    {
+        [Fact]
+        public void default_table_descriptor()
+        {
+             const string sql = """
+                                 CREATE TABLE IF NOT EXISTS outbox (
+                                    id Bigint PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
+                                    message_type Varchar(250) NOT NULL,
+                                    data Jsonb NOT NULL
+                                 );
+                                 """;
+
+            var implicitTableDescriptor = new TableDescriptorBuilder().Build();
+            var explicitTableDescriptor = new TableDescriptorBuilder().UseDefaults().Build();
+            Assert.Equal(implicitTableDescriptor.ToString(), explicitTableDescriptor.ToString());
+            Assert.Equal(sql, implicitTableDescriptor.ToString());
+        }
+
+        [Property]
+        public void with_varying_descriptor(
+            string tableName,
+            string idColName,
+            string messageTypeColName,
+            int messageTypeColDimension,
+            string dataColName)
+        {
+            var sql = $"""
+                       CREATE TABLE IF NOT EXISTS {tableName} (
+                          {idColName} Bigint PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY,
+                          {messageTypeColName} Varchar({messageTypeColDimension}) NOT NULL,
+                          {dataColName} Jsonb NOT NULL
+                       );
+                       """;
+
+            var tableDescriptor = new TableDescriptorBuilder()
+                .Named(tableName)
+                .Id(idColName)
+                .MessageType(messageTypeColName, messageTypeColDimension)
+                .MessageData(dataColName)
+            .Build();
+
+            Assert.Equal(sql, tableDescriptor.ToString());
+        }
+    }
+}