bdk-ffi/bdk-swift/Tests/BitcoinDevKitTests/LiveTxBuilderTests.swift

import XCTest
@testable import BitcoinDevKit

final class LiveTxBuilderTests: XCTestCase {
    var dbFilePath: URL!

    override func setUpWithError() throws {
        super.setUp()
        let fileManager = FileManager.default
        let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask).first!
        let uniqueDbFileName = "bdk_persistence_\(UUID().uuidString).db"
        dbFilePath = documentDirectory.appendingPathComponent(uniqueDbFileName)

        if fileManager.fileExists(atPath: dbFilePath.path) {
            try fileManager.removeItem(at: dbFilePath)
        }
    }

    override func tearDownWithError() throws {
        let fileManager = FileManager.default
        if fileManager.fileExists(atPath: dbFilePath.path) {
            try fileManager.removeItem(at: dbFilePath)
        }
    }

    func testTxBuilder() throws {
        let descriptor = try Descriptor(
            descriptor: "wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)",
            network: Network.testnet
        )
        let wallet = try Wallet(
            descriptor: descriptor,
            changeDescriptor: nil,
            persistenceBackendPath: dbFilePath.path,
            network: .testnet
        )
        let esploraClient = EsploraClient(url: "https://esplora.testnet.kuutamo.cloud/")
        let update = try esploraClient.fullScan(
            wallet: wallet,
            stopGap: 10,
            parallelRequests: 1
        )
        try wallet.applyUpdate(update: update)

        XCTAssertGreaterThan(wallet.getBalance().total, UInt64(0), "Wallet must have positive balance, please add funds")

        let recipient: Address = try Address(address: "tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989", network: .testnet)
        let psbt: PartiallySignedTransaction = try TxBuilder()
            .addRecipient(script: recipient.scriptPubkey(), amount: 4200)
            .feeRate(feeRate: FeeRate.fromSatPerVb(satPerVb: 2))
            .finish(wallet: wallet)

        print(psbt.serialize())
        XCTAssertTrue(psbt.serialize().hasPrefix("cHNi"), "PSBT should start with cHNI")
    }

    func testComplexTxBuilder() throws {
        let descriptor = try Descriptor(
            descriptor: "wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/0/*)",
            network: Network.testnet
        )
        let changeDescriptor = try Descriptor(
            descriptor: "wpkh(tprv8ZgxMBicQKsPf2qfrEygW6fdYseJDDrVnDv26PH5BHdvSuG6ecCbHqLVof9yZcMoM31z9ur3tTYbSnr1WBqbGX97CbXcmp5H6qeMpyvx35B/84h/1h/0h/1/*)",
            network: Network.testnet
        )
        let wallet = try Wallet(
            descriptor: descriptor,
            changeDescriptor: changeDescriptor,
            persistenceBackendPath: dbFilePath.path,
            network: .testnet
        )
        let esploraClient = EsploraClient(url: "https://esplora.testnet.kuutamo.cloud/")
        let update = try esploraClient.fullScan(
            wallet: wallet,
            stopGap: 10,
            parallelRequests: 1
        )
        try wallet.applyUpdate(update: update)

        XCTAssertGreaterThan(wallet.getBalance().total, UInt64(0), "Wallet must have positive balance, please add funds")

        let recipient1: Address = try Address(address: "tb1qrnfslnrve9uncz9pzpvf83k3ukz22ljgees989", network: .testnet)
        let recipient2: Address = try Address(address: "tb1qw2c3lxufxqe2x9s4rdzh65tpf4d7fssjgh8nv6", network: .testnet)
        let allRecipients: [ScriptAmount] = [
            ScriptAmount(script: recipient1.scriptPubkey(), amount: 4200),
            ScriptAmount(script: recipient2.scriptPubkey(), amount: 4200)
        ]

        let psbt: PartiallySignedTransaction = try TxBuilder()
            .setRecipients(recipients: allRecipients)
            .feeRate(feeRate: FeeRate.fromSatPerVb(satPerVb: 4))
            .changePolicy(changePolicy: ChangeSpendPolicy.changeForbidden)
            .enableRbf()
            .finish(wallet: wallet)

        try! wallet.sign(psbt: psbt)

        XCTAssertTrue(psbt.serialize().hasPrefix("cHNi"), "PSBT should start with cHNI")
    }
}