如何对状态包含 StatePointer 的 `Contract` 进行单元测试

Question

当我测试 Contract 的 ContractState 有一个 LinearPointer 到另一个状态时，日志首先显示警告

[WARN] 15:13:20,131 [Test worker] transactions.TransactionBuilder. - WARNING: You must pass in a ServiceHub reference to TransactionBuilder to resolve state pointers outside of flows. If you are writing a unit test then pass in a MockServices instance.

当然测试失败了，因为 Contract 验证的 LedgerTransaction 没有解决指向的状态。

所以我按照说明将 MockService 传递给了 TransactionBuilder。但是出现如下错误：

java.lang.UnsupportedOperationException
    at net.corda.testing.node.MockServices.getVaultService(MockServices.kt:438)
    at net.corda.core.contracts.LinearPointer.resolve(StatePointer.kt:183)
    at net.corda.core.transactions.TransactionBuilder.resolveStatePointers(TransactionBuilder.kt:738)
    at net.corda.core.transactions.TransactionBuilder.addOutputState(TransactionBuilder.kt:804)

挖源码的时候，发现MockService的vaultService找不回来了：

override val vaultService: VaultService get() = throw UnsupportedOperationException()

那么，我应该如何测试这种 Contract，其验证涉及解析 StatePointers 引用的状态？

Answer 1

好的，当我写这个问题时，一个解决方案让我印象深刻：

手动将指向的状态添加到事务中作为参考状态

如何对状态包含 StatePointer 的 `Contract` 进行单元测试

How to unit-test `Contract` whose state contains `StatePointer`

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