         } catch {
             // TODO: Assert the expected error type
         }
-
-    } catch {
-        XCTFail("Error thrown from keychain: \(error)")
-        return
-    }
     }
 
     func itemFromArray(items: [PersistentToken], withPersistentRef persistentRef: NSData) -> PersistentToken? {

        }

        // Add both tokens to the keychain
        let savedItem1 = try keychain.addToken(token1)
        let savedItem2 = try keychain.addToken(token2)
        XCTAssertEqual(savedItem1.token, token1)
        XCTAssertEqual(savedItem2.token, token2)

        // Fetch both tokens from the keychain
        guard let fetchedItem1 = try keychain.persistentTokenWithIdentifier(savedItem1.identifier) else {
            XCTFail("Token should be in keychain: \(token1)")
            return
        }
        guard let fetchedItem2 = try keychain.persistentTokenWithIdentifier(savedItem2.identifier) else {
            XCTFail("Token should be in keychain: \(token2)")
            return
        }
        XCTAssertEqual(savedItem1, fetchedItem1)
        XCTAssertEqual(savedItem2, fetchedItem2)

        // Remove the first token from the keychain
        do {

    }

    func testDuplicateURLs() {
        guard let token1 = Token.URLSerializer.deserialize(kValidTokenURL),
            let token2 = Token.URLSerializer.deserialize(kValidTokenURL) else {
                XCTFail("Failed to construct tokens from url.")
