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我正在将 IdentityServer4 升级到 3.1 版，升级后我遇到了单元测试问题。IdentityServer4.EntityFramework.Stores.ClientStore如下所示：

public class IfloClientStore : ClientStore
{
    private const string Saml2BearerClientSuffix = "_saml2bearer";

    public IfloClientStore(IConfigurationDbContext context, ILogger<ClientStore> logger) : base(context, logger)
    {
    }

    public override async Task<Client> FindClientByIdAsync(string clientId)
    {
        if(string.IsNullOrWhiteSpace(clientId))
            throw new ArgumentException(nameof(clientId) +" is null or empty");

        clientId = clientId.ToLowerInvariant();

        var result = await base.FindClientByIdAsync(MapClientId(clientId));

        if (result == null)
            throw new ResourceNotFoundException(clientId);

        if (IsSamlClient(clientId))
            AllowSamlFlow(result);

        return result;
    }

    private void AllowSamlFlow(Client client)
    {
        client.AllowedGrantTypes.Add(Constants.GrantTypes.Saml2BearerGrant);
    }

    private bool IsSamlClient(string clientId)
    {
        return clientId.EndsWith(Saml2BearerClientSuffix);
    }

    private string MapClientId(string clientId)
    {
        if (IsSamlClient(clientId))
            return clientId.Substring(0, clientId.Length - Saml2BearerClientSuffix.Length);
        return clientId;
    }
}

我的单元测试：

 [Test]
    public async Task FindClientByIdAsync_Given_PFP_Saml2Bearer_Client_Return_PFP_SamlAllowed_Client()
    {
        var client = await underTest.FindClientByIdAsync(PfpWebClientIdForSaml);

        client.ClientId.Should().Be(PfpWebClientId);
        client.AllowedGrantTypes.Single().Should().Be("urn:ietf:params:oauth:grant-type:saml2-bearer");
    }

执行时抛出此异常FindClientByIdAsync：

Message: 
System.InvalidOperationException : The provider for the source IQueryable doesn't implement IAsyncQueryProvider. Only providers that implement IAsyncQueryProvider can be used for Entity Framework asynchronous operations.

堆栈跟踪： EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable 1 source, Expression expression, CancellationToken cancellationToken) EntityFrameworkQueryableExtensions.ExecuteAsync[TSource,TResult](MethodInfo operatorMethodInfo, IQueryable1 源，CancellationToken cancelToken) EntityFrameworkQueryableExtensions.FirstOrDefaultAsync[TSource](IQueryable 1 source, CancellationToken cancellationToken) ClientStore.FindClientByIdAsync(String clientId) IfloClientStore.FindClientByIdAsync(String clientId) line 27 TestIfloClientStore.FindClientByIdAsync_Given_PFP_Saml2Bearer_Client_Return_PFP_SamlAllowed_Client() line 43 GenericAdapter1.GetResult() AsyncToSyncAdapter.Await(Func`1 调用) TestMethodCommand.RunTestMethod(TestExecutionContext 上下文) TestMethodCommand.Execute(TestExecutionContext context) <>c__DisplayClass1_0.b__0() BeforeAndAfterTestCommand.RunTestMethodInThreadAbortSafeZone(TestExecutionContext context, Action action)

如果我降级IdentityServer4.EntityFramework到 3.0 版，它工作得很好。但我想确定 IDS4 是否有错误，或者我是否因为升级而必须更改某些内容。有人可以帮助我吗？

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