Tests: Add in-memory database for testing

Tests/DatabaseSetup.cs

@@ -0,0 +1,27 @@
+using Elwig.Helpers;
+using Microsoft.Data.Sqlite;
+using System.Reflection;
+
+namespace Tests {
+    [SetUpFixture]
+    public class DatabaseSetup {
+
+        private SqliteConnection? Connection;
+
+        [OneTimeSetUp]
+        public async Task SetupDatabase() {
+            AppDbContext.ConnectionStringOverride = $"Data Source=ElwigTestDB; Mode=Memory; Foreign Keys=True; Cache=Default";
+            Connection = await AppDbContext.ConnectAsync();
+            await AppDbContext.ExecuteEmbeddedScript(Connection, Assembly.GetExecutingAssembly(), "Tests.Resources.Create.sql");
+        }
+
+        [OneTimeTearDown]
+        public async Task TeardownDatabase() {
+            AppDbContext.ConnectionStringOverride = null;
+            if (Connection == null) return;
+            await Connection.DisposeAsync();
+            Connection = null;
+            // The in-memory database will be dropped if all connections to it are closed
+        }
+    }
+}

Tests/HelpersBillingTest.cs

@@ -0,0 +1,30 @@
+using Elwig.Helpers;
+using Microsoft.Data.Sqlite;
+using System.Reflection;
+
+namespace Tests {
+    [TestFixture]
+    public class HelpersBillingTest {
+
+        private SqliteConnection? Connection;
+
+        [OneTimeSetUp]
+        public async Task SetupDatabase() {
+            Connection = await AppDbContext.ConnectAsync();
+            await AppDbContext.ExecuteEmbeddedScript(Connection, Assembly.GetExecutingAssembly(), "Tests.Resources.BillingInsert.sql");
+        }
+
+        [OneTimeTearDown]
+        public async Task TeardownDatabase() {
+            if (Connection == null) return;
+            await AppDbContext.ExecuteEmbeddedScript(Connection, Assembly.GetExecutingAssembly(), "Tests.Resources.BillingDelete.sql");
+            await Connection.DisposeAsync();
+            Connection = null;
+        }
+
+        [Test]
+        public void Test() {
+            // TODO
+        }
+    }
+}

Tests/Resources/BillingDelete.sql

@@ -0,0 +1 @@
+-- deletes for HelpersBillingTest

Tests/Resources/BillingInsert.sql

@@ -0,0 +1 @@
+-- inserts for HelpersBillingTest

Tests/Tests.csproj

@@ -9,6 +9,14 @@
     <IsTestProject>true</IsTestProject>
   </PropertyGroup>
 
+  <ItemGroup>
+    <EmbeddedResource Include="Resources\*.sql" />
+  </ItemGroup>
+
+  <Target Name="PreBuild" BeforeTargets="PreBuildEvent">
+    <Exec Command="call fetch-resources.bat" />
+  </Target>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.3.2" />
     <PackageReference Include="NUnit" Version="3.13.3" />

Tests/fetch-resources.bat

@@ -0,0 +1 @@
+curl -s "https://www.necronda.net/elwig/files/create.sql?v=12" -u "elwig:ganzGeheim123!" -o "Resources\Create.sql"