core: Implement RegtestWalletAppKit

The RegtestWalletAppKit sets up BitcoinJ and loads the given wallets.

core/build.gradle

@@ -1,6 +1,7 @@
 plugins {
     id 'bisq.java-conventions'
     id 'bisq.javafx'
+    id 'bisq.java-integration-tests'
 }
 
 javafx {
@@ -61,6 +62,10 @@ dependencies {
     testAnnotationProcessor libs.lombok
     testCompileOnly libs.lombok
     testImplementation libs.natpryce.make.it.easy
+
+    integrationTestImplementation libs.junit.jupiter
+    integrationTestAnnotationProcessor libs.lombok
+    integrationTestCompileOnly libs.lombok
 }
 
 test {

core/src/integrationTest/java/bisq/core/RegtestWalletAppKit.java

@@ -0,0 +1,41 @@
+package bisq.core;
+
+import bisq.core.btc.wallet.WalletFactory;
+
+import org.bitcoinj.core.NetworkParameters;
+import org.bitcoinj.kits.WalletAppKit;
+import org.bitcoinj.wallet.Wallet;
+
+import java.nio.file.Path;
+
+import java.util.List;
+
+import lombok.Getter;
+
+@Getter
+public class RegtestWalletAppKit {
+    private final WalletAppKit walletAppKit;
+
+    public RegtestWalletAppKit(NetworkParameters networkParams, Path dataDirPath, List<Wallet> wallets) {
+        walletAppKit = new WalletAppKit(networkParams, dataDirPath.toFile(), "dataDirFilePrefix") {
+            @Override
+            protected void onSetupCompleted() {
+                super.onSetupCompleted();
+                wallets.forEach(wallet -> {
+                    vChain.addWallet(wallet);
+                    vPeerGroup.addWallet(wallet);
+                });
+            }
+        };
+    }
+
+    public void initialize() {
+        walletAppKit.connectToLocalHost();
+
+        var walletFactory = new WalletFactory(walletAppKit.params());
+        walletAppKit.setWalletFactory((params, keyChainGroup) -> walletFactory.createBsqWallet());
+
+        walletAppKit.startAsync();
+        walletAppKit.awaitRunning();
+    }
+}