session-ios/Signal/test/util/StringAdditionsTest.swift

//
//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
//

import XCTest

class StringAdditionsTest: XCTestCase {

    override func setUp() {
        super.setUp()
        // Put setup code here. This method is called before the invocation of each test method in the class.
    }

    override func tearDown() {
        // Put teardown code here. This method is called after the invocation of each test method in the class.
        super.tearDown()
    }

    func testASCII() {
        let originalString = "Hello World"

        var truncatedString = originalString.truncated(toByteCount: 8)
        XCTAssertEqual("Hello Wo", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 0)
        XCTAssertEqual("", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 11)
        XCTAssertEqual("Hello World", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 12)
        XCTAssertEqual("Hello World", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 100)
        XCTAssertEqual("Hello World", truncatedString)
    }

    func testMultiByte() {
        let originalString = "🇨🇦🇨🇦🇨🇦🇨🇦"

        var truncatedString = originalString.truncated(toByteCount: 0)
        XCTAssertEqual("", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 1)
        XCTAssertEqual("", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 7)
        XCTAssertEqual("", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 8)
        XCTAssertEqual("🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 9)
        XCTAssertEqual("🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 15)
        XCTAssertEqual("🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 16)
        XCTAssertEqual("🇨🇦🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 17)
        XCTAssertEqual("🇨🇦🇨🇦", truncatedString)
    }

    func testMixed() {
        let originalString = "Oh🇨🇦Canada🇨🇦"

        var truncatedString = originalString.truncated(toByteCount: 0)
        XCTAssertEqual("", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 1)
        XCTAssertEqual("O", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 7)
        XCTAssertEqual("Oh", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 9)
        XCTAssertEqual("Oh", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 10)
        XCTAssertEqual("Oh🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 11)
        XCTAssertEqual("Oh🇨🇦C", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 23)
        XCTAssertEqual("Oh🇨🇦Canada", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 24)
        XCTAssertEqual("Oh🇨🇦Canada🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 25)
        XCTAssertEqual("Oh🇨🇦Canada🇨🇦", truncatedString)

        truncatedString = originalString.truncated(toByteCount: 100)
        XCTAssertEqual("Oh🇨🇦Canada🇨🇦", truncatedString)
    }

}