simplify like refs

Signed-off-by: William Casarin <jb55@jb55.com>

damusTests/LikeTests.swift

@@ -0,0 +1,33 @@
+//
+//  LikeTests.swift
+//  damusTests
+//
+//  Created by William Casarin on 2022-05-08.
+//
+
+import XCTest
+@testable import damus
+
+class LikeTests: XCTestCase {
+
+    override func setUpWithError() throws {
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+
+    override func tearDownWithError() throws {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+    }
+
+    func testLikeHasNotification() throws {
+        let liked = NostrEvent(content: "awesome #[0] post", pubkey: "orig_pk", tags: [["p", "cindy"], ["e", "bob"]])
+        liked.calculate_id()
+        let id = liked.id
+        let like_ev = make_like_event(pubkey: "pubkey", liked: liked)!
+        
+        XCTAssertTrue(like_ev.references(id: "orig_pk", key: "p"))
+        XCTAssertTrue(like_ev.references(id: "cindy", key: "p"))
+        XCTAssertTrue(like_ev.references(id: "bob", key: "e"))
+        XCTAssertEqual(like_ev.last_refid()!.ref_id, id)
+    }
+
+}