C#•2w ago

Populating IOptions in integration tests

Hi, I'm struggling with IOptions when building integration tests specifically, as I'm getting the 'InvalidOperationException: Section 'MySection' not found in configuration' on startup. Those options are mandatory. I know two approach, which both didn't seem to work. First is with AddInMemoryCollection

protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureAppConfiguration((context, configBuilder) =>
        {
            var inMemorySettings = new Dictionary<string, string?>
            {
                { "ConnectionStrings:DefaultConnection", connectionString },
                { "MySection:SomeAttribute", "Hello there!" },
            };
            configBuilder.AddInMemoryCollection(inMemorySettings);
        });
        // ....
    }

protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureAppConfiguration((context, configBuilder) =>
        {
            var inMemorySettings = new Dictionary<string, string?>
            {
                { "ConnectionStrings:DefaultConnection", connectionString },
                { "MySection:SomeAttribute", "Hello there!" },
            };
            configBuilder.AddInMemoryCollection(inMemorySettings);
        });
        // ....
    }

here I have no idea why I have no problem with the connection string, but with the option. Second approach I tried was to add a testing appsettings:

protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureAppConfiguration((context, configBuilder) =>
        {
            var inMemorySettings = new Dictionary<string, string?>
            {
                { "ConnectionStrings:DefaultConnection", connectionString }
            };
            configBuilder.AddInMemoryCollection(inMemorySettings);
            configBuilder
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.Integrationtests.json", optional: false, reloadOnChange: true);
        });
        // ....
    }

protected override void ConfigureWebHost(IWebHostBuilder builder)
    {
        builder.ConfigureAppConfiguration((context, configBuilder) =>
        {
            var inMemorySettings = new Dictionary<string, string?>
            {
                { "ConnectionStrings:DefaultConnection", connectionString }
            };
            configBuilder.AddInMemoryCollection(inMemorySettings);
            configBuilder
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.Integrationtests.json", optional: false, reloadOnChange: true);
        });
        // ....
    }

which I expected to work ... but it didn't either. So I guess I'm making a pretty obvious mistake, but I don't see it. I hope somebody can help me

5 Replies

JakenVeina•2w ago

well, the first thing I would tell you to do is stop trying to use ConfigureWebHost() in a testing project or are you trying to actually do full-stack testing of your web host? even if you are, I'd say it's prooooooobably a better idea to have dedicated DI for testing for your particular problem, that would allow you to potentially omit .Validate() on the options setups if you're not talking about full-stack testing, you should DEFINITELY take a more direct approach of just building a DI container for just the stuff you need for each test fixture

Unknown User•2w ago

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TauFrischOP•2w ago

ah, thanks for the answer! It actually seems to work, but with a catch. Now I'm getting: FileNotFoundException: The configuration file 'appsettings.Test.json' was not found and is not optional. The expected physical path was '/Users/abenda/Documen ts/GitHub/attendance-list-backend/tests/ApiIntegrationTests/ApiIntegrationTests/bin/Debug/net9.0/appsettings.Test.json'. can you tell me how I can motivate .net to copy the appsettings to the bin folder on build? 😅

Unknown User•2w ago

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TauFrischOP•2w ago

perfect, that helep! On Rider its options + enter :catok: thank's for the help!

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Populating IOptions in integration tests

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