feat: implement repeat function and add tests for string repetition cases

Author: Tarawally

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

@@ -1,5 +1,12 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (count < 0) throw new Error("Count cannot be negative");
+  if (count === 0) return "";
+
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result += str;
+  }
+  return result;
 }
 
-module.exports = repeatStr;
+module.exports = repeat;

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

@@ -21,12 +21,34 @@ test("should repeat the string count times", () => {
 // When the repeatStr function is called with these inputs,
 // Then it should return the original str without repetition, ensuring that a count of 1 results in no repetition.
 
+test("should return the original string when count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("hello");
+});
+
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeatStr function is called with these inputs,
 // Then it should return an empty string, ensuring that a count of 0 results in an empty output.
 
+test("should return an empty string when count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  const repeatedStr = repeatStr(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeatStr function is called with these inputs,
 // Then it should throw an error or return an appropriate error message, as negative counts are not valid.
+
+test("should throw an error when count is negative", () => {
+  const str = "hello";
+  const count = -1;
+  expect(() => {
+    repeatStr(str, count);
+  }).toThrow("Count cannot be negative");
+});