Tests: Add in-memory database for testing

.gitignore

@@ -3,3 +3,4 @@ bin/
 *.user
 .vs
 .idea
+Tests/Resources/Create.sql

Elwig/Helpers/AppDbContext.cs

@@ -64,7 +64,8 @@ namespace Elwig.Helpers {
         public DateTime SavedLastWriteTime { get; private set; }
         public bool HasBackendChanged => SavedLastWriteTime != LastWriteTime;
 
-        public static string ConnectionString => $"Data Source=\"{App.Config.DatabaseFile}\"; Foreign Keys=True; Mode=ReadWrite; Cache=Default";
+        public static string? ConnectionStringOverride { get; set; } = null;
+        public static string ConnectionString => ConnectionStringOverride ?? $"Data Source=\"{App.Config.DatabaseFile}\"; Mode=ReadWrite; Foreign Keys=True; Cache=Default";
 
         private readonly Dictionary<int, Dictionary<int, Dictionary<string, AreaComBucket>>> _memberAreaCommitmentBuckets = [];
         private readonly Dictionary<int, Dictionary<int, Dictionary<string, int>>> _memberDeliveryBuckets = [];

Elwig/Helpers/AppDbUpdater.cs

@@ -8,6 +8,7 @@ using System.Threading.Tasks;
 namespace Elwig.Helpers {
     public static class AppDbUpdater {
 
+        // Don't forget to update value in Tests/fetch-resources.bat!
         public static readonly int RequiredSchemaVersion = 12;
 
         private static int VersionOffset = 0;

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"