test: add excluded-in-CI live tests

bdk-swift/Tests/BitcoinDevKitTests/OfflineDescriptorTests.swift

@@ -0,0 +1,20 @@
+import XCTest
+@testable import BitcoinDevKit
+
+final class OfflineDescriptorTests: XCTestCase {
+    func testDescriptorBip86() throws {
+        let mnemonic: Mnemonic = try Mnemonic.fromString(mnemonic: "space echo position wrist orient erupt relief museum myself grain wisdom tumble")
+        let descriptorSecretKey: DescriptorSecretKey = DescriptorSecretKey(
+            network: Network.testnet,
+            mnemonic: mnemonic,
+            password: nil
+        )
+        let descriptor: Descriptor = Descriptor.newBip86(
+            secretKey: descriptorSecretKey,
+            keychain: KeychainKind.external,
+            network: Network.testnet
+        )
+
+        XCTAssertEqual(descriptor.asString(), "tr([be1eec8f/86'/1'/0']tpubDCTtszwSxPx3tATqDrsSyqScPNnUChwQAVAkanuDUCJQESGBbkt68nXXKRDifYSDbeMa2Xg2euKbXaU3YphvGWftDE7ozRKPriT6vAo3xsc/0/*)#m7puekcx")
+    }
+}