Add test to get reverse resolver from the registry

Author: livid

Sources/ENSKit/ENSKit.swift

@@ -33,6 +33,11 @@ public struct ENSKit {
         )
     }
 
+    public func resolver(addr: String) async throws -> ENSResolver? {
+        let reversedDomain = addr.lowercased().replacingOccurrences(of: "0x", with: "") + ".addr.reverse"
+        return try await resolver(name: reversedDomain)
+    }
+
     public func contenthash(name: String) async -> URL? {
         if let resolver = try? await resolver(name: name),
            let contenthash = try? await resolver.contenthash() {

Tests/ENSKitTests/EthereumContractTests/RegistryContractTests.swift

@@ -15,6 +15,17 @@ final class RegistryContractTests: XCTestCase {
         }
     }
 
+    func testReverseResolver() async throws {
+        let contract = RegistryContract(client: client)
+        let vitalik = Namehash.namehash("d8da6bf26964af9d7eed9e03e53415d37aa96045.addr.reverse")
+        let result = try await contract.resolver(namehash: vitalik)
+        if let ethResolver = result {
+            XCTAssertEqual(ethResolver, try! Address("0x5fbb459c49bb06083c33109fa4f14810ec2cf358"))
+        } else {
+            XCTFail()
+        }
+    }
+
     func testResolverNoResult() async throws {
         let contract = RegistryContract(client: client)
         let unsupported = Namehash.namehash("unsupportedENS")