write function repeat-str()

Author: XiaoQuark

Sprint-3/2-practice-tdd/repeat-str.js

@@ -1,5 +1,6 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count >= 0) return str.repeat(count);
+  else throw new Error("Invalid format: count cannot be");
 }
 
 module.exports = repeatStr;

Sprint-3/2-practice-tdd/repeat-str.test.js

@@ -49,5 +49,5 @@ test("should throw an error when count is negative", () => {
   const str = "hello";
   const count = -6;
   const repeatedStr = () => repeatStr(str, count);
-  expect(repeatedStr).toThrow(/negative/);
+  expect(repeatedStr).toThrow(/Invalid format/);
 });