Init repo

test/MissionControl.Server.Tests/TestDatabase.cs

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+using Microsoft.Data.Sqlite;
+using Microsoft.EntityFrameworkCore;
+using MissionControl.Data;
+
+namespace MissionControl.Server.Tests;
+
+/// <summary>
+/// An in-memory SQLite database that speaks real EF Core, for fast endpoint tests
+/// without a SQL Server instance.
+/// </summary>
+public sealed class TestDatabase : IDisposable
+{
+    private readonly SqliteConnection _connection = new("DataSource=:memory:");
+
+    public TestDatabase()
+    {
+        _connection.Open();
+
+        var options = new DbContextOptionsBuilder<MissionControlContext>()
+            .UseSqlite(_connection)
+            .Options;
+
+        Context = new MissionControlContext(options);
+        Context.Database.EnsureCreated();
+    }
+
+    public MissionControlContext Context { get; }
+
+    public void Dispose()
+    {
+        Context.Dispose();
+        _connection.Dispose();
+    }
+}