C#•17mo ago

❔ WebApplicationFactory and integration tests

I've run into an issue with my integration tests and I'm looking for some insight. I'm using WebApplicationFactory and trying to set up a configuration inside it. Here's what it looks like:

protected override void ConfigureWebHost(IWebHostBuilder builder)
{
    // Setting up an in-memory collection for my database configuration here
    builder.ConfigureAppConfiguration(
        (context, config) =>
        {
            config.AddInMemoryCollection(
                    new Dictionary<string, string>
                    {
                        [$"{DatabaseConfiguration.SectionName}:{nameof(DatabaseConfiguration.MasterConnectionString)}"] =
                            connectionString,
                        [$"{DatabaseConfiguration.SectionName}:{nameof(DatabaseConfiguration.ReplicaConnectionString)}"] =
                            connectionString
                    });
            // Adding more services and authentication schemes
        });
}

protected override void ConfigureWebHost(IWebHostBuilder builder)
{
    // Setting up an in-memory collection for my database configuration here
    builder.ConfigureAppConfiguration(
        (context, config) =>
        {
            config.AddInMemoryCollection(
                    new Dictionary<string, string>
                    {
                        [$"{DatabaseConfiguration.SectionName}:{nameof(DatabaseConfiguration.MasterConnectionString)}"] =
                            connectionString,
                        [$"{DatabaseConfiguration.SectionName}:{nameof(DatabaseConfiguration.ReplicaConnectionString)}"] =
                            connectionString
                    });
            // Adding more services and authentication schemes
        });
}

Now, I have a separate setup in my Program.cs file, where I am adding some services including DbContexts. Here's how it looks:

WebApplicationBuilder builder = WebApplication.CreateBuilder();
// Some services and localization stuff
// ...
builder.Host
    .AddDbContexts<MasterDbContext, ReplicaDbContext>(true, true)
    .AddOpenIddict()
    .AddKafkaProducer<AuditLogProducer>();

WebApplicationBuilder builder = WebApplication.CreateBuilder();
// Some services and localization stuff
// ...
builder.Host
    .AddDbContexts<MasterDbContext, ReplicaDbContext>(true, true)
    .AddOpenIddict()
    .AddKafkaProducer<AuditLogProducer>();

My AddDbContexts method is actually adding contexts using UseNpgsql and it takes the connection string from my configuration.

2 Replies

no >> bodyOP•17mo ago

public static IHostBuilder AddDbContexts<TMaster, TReplica>(
this IHostBuilder hostBuilder,
bool initializeMaster,
bool initializeReplica)
where TMaster : DbContext
where TReplica : DbContext
=> hostBuilder.ConfigureServices(
    (hostContext, services) =>
    {
        DatabaseConfiguration databaseConfiguration =
            hostContext.Configuration.GetSection(DatabaseConfiguration.SectionName).Get<DatabaseConfiguration>() ??
            throw new ArgumentNullException(nameof(databaseConfiguration));
        // Some DbContext registration stuff
    });

public static IHostBuilder AddDbContexts<TMaster, TReplica>(
this IHostBuilder hostBuilder,
bool initializeMaster,
bool initializeReplica)
where TMaster : DbContext
where TReplica : DbContext
=> hostBuilder.ConfigureServices(
    (hostContext, services) =>
    {
        DatabaseConfiguration databaseConfiguration =
            hostContext.Configuration.GetSection(DatabaseConfiguration.SectionName).Get<DatabaseConfiguration>() ??
            throw new ArgumentNullException(nameof(databaseConfiguration));
        // Some DbContext registration stuff
    });

Here's the tricky part: my ConfigureAppConfiguration is called after the Program.cs so at the point when I need the connection strings, they are null. I tried to solve this by moving my configuration setup to IHostBuilder.ConfigureAppConfiguration instead of IWebHostBuilder.ConfigureAppConfiguration, but it didn't work. I feel like I'm missing something basic here. Any advice or pointers would be really appreciated. Thanks!

Accord•17mo ago

Looks like nothing has happened here. I will mark this as stale and this post will be archived until there is new activity.

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❔ WebApplicationFactory and integration tests