Why test code not working for using NbitcoinTest?

[zydjohnHotmail]

Hello:
I want to run some test for using Nbitcoin.Tests & Nbitcoin.RPC.
I created one xUnit Test Project, and some NUGET packages.
The following is my code:

using NBitcoin.Tests;
using NBitcoin;
using Xunit.Abstractions;
using NBitcoin.RPC;

namespace IntegrationTest1
{
public class UnitTest1
{
public ITestOutputHelper Logger { get; }

    public UnitTest1(ITestOutputHelper logger)
    {
        Logger = logger;
    }

    [Fact]
    public void AliceSendToBob()
    {
        using var env =
        NodeBuilder.Create(NodeDownloadData.Bitcoin.v0_20_0, Bitcoin.Instance.Regtest);
        CoreNode? miner = env.CreateNode();
        CoreNode? alice = env.CreateNode();
        CoreNode? bob = env.CreateNode();
        env.StartAll();
        Logger.WriteLine("Miner, Alice and Bob started");
        RPCClient? minerRPC = miner.CreateRPCClient();
        RPCClient? aliceRPC = alice.CreateRPCClient();
        RPCClient? bobRPC = bob.CreateRPCClient();
        minerRPC.Generate(100);
        BitcoinAddress? aliceAddress = aliceRPC.GetNewAddress();
        Logger.WriteLine("Miner just sent 1 BTC to Alice");
        minerRPC.SendToAddress(aliceAddress, Money.Coins(1.0m));
        Logger.WriteLine("Let's connect the Miner to Alice and Bob");
        miner.Sync(alice, true);
        miner.Sync(bob, true);
        Assert.Equal(Money.Coins(1.0m), aliceRPC.GetBalance());
        Logger.WriteLine("Alice check account balance!");
    }

}

}

But my test failed:
Message: 
NBitcoin.RPC.RPCException : Insufficient funds

I don’t quite understand, I think the miner has more than enough funds to give to Alice, but the test failed.
Let me know how to change the code, so the test can succeed.
Thanks,

[lontivero]

Because you have mature coins. A utxo must be at least 101 depth and in your test none has that.

[zydjohnHotmail]

Hi,
Thanks for your response. I hope if I understand it correctly:
minerRPC.Generate(100);
This statement means miner has generated 100 blocks in block height, then how can I find how much money the miner has now, so when I want to send Alice money from miner, I can make sure that miner has enough already mature funds?
Can I see it from VS2022 debug window or use some NBitcoin function?
Please advise,
Thanks,

[zydjohnHotmail]

OK. Thanks, I understand it now!