test: add regtest esplora client test

Author: thunderbiscuit

bdk-android/lib/build.gradle.kts

@@ -56,6 +56,7 @@ dependencies {
     androidTestImplementation("androidx.test.espresso:espresso-core:3.4.0")
     androidTestImplementation("org.jetbrains.kotlin:kotlin-test:1.6.10")
     androidTestImplementation("org.jetbrains.kotlin:kotlin-test-junit:1.6.10")
+    androidTestImplementation("org.kotlinbitcointools:regtest-toolbox:0.2.0")
 }
 
 mavenPublishing {

bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit/Constants.kt

@@ -41,3 +41,5 @@ val NON_EXTENDED_DESCRIPTOR_1: Descriptor = Descriptor(
 const val TEST_EXTENDED_PRIVKEY_0 = "tprv8ZgxMBicQKsPdWAHbugK2tjtVtRjKGixYVZUdL7xLHMgXZS6BFbFi1UDb1CHT25Z5PU1F9j7wGxwUiRhqz9E3nZRztikGUV6HoRDYcqPhM4"
 const val BIP84_TEST_RECEIVE_PATH_0 = "84h/1h/0h/0"
 val TEST_BIP84_DESCRIPTOR_0 = Descriptor("wpkh($TEST_EXTENDED_PRIVKEY_0/$BIP84_TEST_RECEIVE_PATH_0/*)", Network.REGTEST)
+
+const val ESPLORA_REGTEST_URL = "http://10.0.2.2:3002"

bdk-android/lib/src/androidTest/kotlin/org/bitcoindevkit/EsploraClientTest.kt

@@ -0,0 +1,55 @@
+package org.bitcoindevkit
+
+import kotlin.test.Test
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.runBlocking
+import org.junit.runner.RunWith
+import org.kotlinbitcointools.regtesttoolbox.regenv.RegEnv
+import kotlin.time.Duration.Companion.milliseconds
+
+@RunWith(AndroidJUnit4::class)
+class EsploraClientTest {
+    private val conn: Persister = Persister.newInMemory()
+
+    @Test
+    fun walletSyncWithEsploraClient() {
+        runBlocking {
+            val regtestEnv = RegEnv.connectTo(
+                host = "10.0.2.2",
+                walletName = "faucet",
+                username = "regtest",
+                password = "password",
+            )
+
+            val wallet: Wallet = Wallet.createSingle(
+                descriptor = BIP86_DESCRIPTOR,
+                network = Network.REGTEST,
+                persister = conn
+            )
+            val newAddress = wallet.revealNextAddress(KeychainKind.EXTERNAL).address
+
+            val txidString = regtestEnv.send(newAddress.toString(), 0.12345678, 2.0)
+            regtestEnv.mine(2)
+
+            val esploraClient = EsploraClient(ESPLORA_REGTEST_URL)
+            val txid = Txid.fromString(txidString)
+            // Wait for the Esplora client to see the transaction. Try 5x per second for 20 seconds.
+            repeat(100) {
+                if (esploraClient.getTx(txid) != null) return@repeat
+                delay(200.milliseconds)
+            }
+
+            val fullScanRequest: FullScanRequest = wallet.startFullScan().build()
+            val update = esploraClient.fullScan(fullScanRequest, 10uL, 1uL)
+
+            wallet.applyUpdate(update)
+            wallet.persist(conn)
+
+            val balance = wallet.balance().total.toSat()
+            assert(balance > 0uL) {
+                "Balance should be greater than zero, but was $balance"
+            }
+        }
+    }
+}