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| <!DOCTYPE html> | ||
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| <title>In-Memory Testing | FluentMigrator documentation </title> | ||
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| <article class="content wrap" id="_content" data-uid="in-memory-testing"> | ||
| <h1 id="in-memory-testing">In-Memory Testing</h1> | ||
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| <p>When performing integration testing, it's sometimes helpful to be able to use an in-memory database (such as Sqlite) to act as the database while tests are running. As a result, this article describes how you can accomplish this with FluentMigrator.</p> | ||
| <p><em>Credit to Craig on this <a href="https://stackoverflow.com/a/66926940">StackOverflow answer</a> that in turn created an issue for us to add this to the documentation.</em></p> | ||
| <p><em>Note: Sqlite only keeps the in-memory database in memory for the time the process is running. In addition, all connection strings that utilize the same name will access the same database.</em></p> | ||
| <p>Create InMemory database, setup FluentMigrator and execute migrations during test setup:</p> | ||
| <pre><code class="lang-csharp">public static IDisposable CreateInMemoryDatabase(Assembly AssemblyWithMigrations, IServiceCollection services = null) | ||
| { | ||
| if (services == null) | ||
| services = new ServiceCollection(); | ||
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| var connectionString = GetSharedConnectionString(); | ||
| var connection = GetPersistantConnection(connectionString); | ||
| MigrateDb(services, connectionString, AssemblyWithMigrations); | ||
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| services.AddSingleton<IConnectionFactory>(new InMemoryConnectionFactory(connectionString)); | ||
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| return services.BuildServiceProvider() | ||
| .GetRequiredService<IDisposableUnderlyingQueryingTool>(); | ||
| } | ||
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| private static string GetSharedConnectionString() | ||
| { | ||
| var dbName = Guid.NewGuid().ToString(); | ||
| return $"Data Source={dbName};Mode=Memory;Cache=Shared"; | ||
| } | ||
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| private static void MigrateDb(IServiceCollection services, string connectionString, Assembly assemblyWithMigrations) | ||
| { | ||
| var sp = services.AddFluentMigratorCore() | ||
| .ConfigureRunner(fluentMigratorBuilder => fluentMigratorBuilder | ||
| .AddSQLite() | ||
| .WithGlobalConnectionString(connectionString) | ||
| .ScanIn(assemblyWithMigrations).For.Migrations() | ||
| ) | ||
| .BuildServiceProvider(); | ||
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| var runner = sp.GetRequiredService<IMigrationRunner>(); | ||
| runner.MigrateUp(); | ||
| } | ||
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| private static IDbConnection GetPersistantConnection(string connectionString) | ||
| { | ||
| var connection = new SqliteConnection(connectionString); | ||
| connection.Open(); | ||
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| return connection; | ||
| } | ||
| </code></pre> | ||
| <p>This serves as an example test utilizing the static methods above:</p> | ||
| <pre><code class="lang-csharp">[TestFixture] | ||
| public Test : IDisposable { | ||
| private readonly IDisposable _holdingConnection; | ||
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| [Test] | ||
| public Test() { | ||
| _holdingConnection = CreateInMemoryDatabase(typeof(MyFirstMigration).Assembly); | ||
| } | ||
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| public void Dispose() { | ||
| _holdingConnection.Dispose(); | ||
| } | ||
| } | ||
| </code></pre> | ||
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