Populating IOptions in integration tests

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 }
            };
            configBuilder.AddInMemoryCollection(inMemorySettings);
            configBuilder
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.Integrationtests.json", optional: false, reloadOnChange: true);
        });
        // ....
    }