Merge pull request #2036 from khashiguchi/master

Implement Host.isEqual and Test

Author: ikesyo

Foundation/Host.swift

@@ -75,7 +75,8 @@ open class Host: NSObject {
     }
 
     open func isEqual(to aHost: Host) -> Bool {
-        return false
+        if self === aHost { return true }
+        return addresses.firstIndex { aHost.addresses.contains($0) } != nil
     }
 
     internal func _resolveCurrent() {

TestFoundation/TestHost.swift

@@ -12,6 +12,7 @@ class TestHost: XCTestCase {
     static var allTests: [(String, (TestHost) -> () throws -> Void)] {
         return [
             ("test_addressesDoNotGrow", test_addressesDoNotGrow),
+            ("test_isEqual", test_isEqual)
         ]
     }
 
@@ -32,5 +33,21 @@ class TestHost: XCTestCase {
         let swiftAddressesSecond = swift.addresses
         XCTAssertEqual(swiftAddressesSecond.count, swiftAddressesFirst.count)
     }
+
+    func test_isEqual() {
+        let host0 = Host(address: "8.8.8.8")
+        let host1 = Host(address: "8.8.8.8")
+        XCTAssertTrue(host0.isEqual(to: host1))
+
+        let host2 = Host(address: "8.8.8.9")
+        XCTAssertFalse(host0.isEqual(to: host2))
+
+        let swift0 = Host(name: "swift.org")
+        let swift1 = Host(name: "swift.org")
+        XCTAssertTrue(swift0.isEqual(to: swift1))
+
+        let google = Host(name: "google.com")
+        XCTAssertFalse(swift0.isEqual(to: google))
+    }
 }