         XCTAssertEqual(lineString.lineNumber(at: 1), lineNumber)  // 2
         XCTAssertEqual(lineString.lineRange(at: 1), lineRange)    // NSRange(1..<3)
         
-        for _ in (0..<20) {
+        for _ in 0..<20 {
             let lineString = LineString(String(" 🐶 \n 🐱 \n 🐮 \n".shuffled()))
             
             for index in (0..<lineString.string.length).shuffled() {

        let lineString2 = LineString("dog \n\n cat \n cow ")
        XCTAssertEqual(lineString2.lineNumber(at: 17), 4)
        
        for _ in (0..<20) {
            let string = String(" 🐶 \n 🐱 \n 🐮 \n".shuffled())
            let lineString = LineString(string)
            

        let lineString2 = LineString("dog \n\n cat \n cow ")
        XCTAssertEqual(lineString2.lineRange(at: 17), NSRange(12..<17))
        
        for _ in 0..<20 {
            let string = String(" 🐶 \n 🐱 \n 🐮 \n".shuffled())
            let lineString = LineString(string)
            
