从Microsoft.AspNetCore.TestHost.TestServer获取连接字符串值

Question

I have a test project, i need to get the connection string value in a test class

public class EmplyeesScenarios
{
    private readonly TestServer _testServer;
    private readonly AppDbContext _testService;

    public EmplyeesScenarios()
    {
        _testServer = TestServerFactory.CreateServer<TestsStartup>();
        var dbOption = new DbContextOptionsBuilder<AppDbContext>()
                       .UseSqlServer("//here i need to put the same connection string of _testServer")
                       .Options;
        _testService = new AppDbContext(dbOption);

    }
}

Answer 1

You can use the service collection on your test host. For example:

var config = _testServer.Host.Services.GetRequiredService<IConfigurationRoot>();
var connectionString = config.GetConnectionString("Foo");

However, you should actually be using this for all your services, so instead of trying to new up your context at all, just do:

var context = _testServer.Host.Services.GetRequiredService<AppDbContext>();

No connection string needed.

Answer 2

Assuming that your test server is set up properly, you should just resolve your database context from the server instance directly. Like this:

_testServer = TestServerFactory.CreateServer<TestsStartup>();

// create service scope and retrieve database context
using (var scope = _testServer.Host.Services.CreateScope())
{
    var db = scope.ServiceProvider.GetService<AppDbContext>();

    // ensure that the db is created for example
    await db.Database.EnsureCreatedAsync();

    // add test fixtures or whatever
}

Technically, you could also resolve the configuration from the test host and the read the connection string out of it but since you are doing an integration test , you should actually test the full integration and not deviate from the existing setup by creating your database context manually.