implemented repeat function and associated tests

Author: i786m

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

@@ -1,5 +1,8 @@
-function repeat() {
-  return "hellohellohello";
+function repeat(str, count) {
+  if (count < 0) {
+    return "Count must be a non-negative integer"
+  }
+  return str.repeat(count);
 }
 
 module.exports = repeat;

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

@@ -21,12 +21,30 @@ test("should repeat the string count times", () => {
 // When the repeat 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 original string if count is 1", () => {
+  const str = "hello";
+  const count = 1;
+  expect(repeat(str, count)).toEqual("hello");
+}); 
+
 // case: Handle Count of 0:
 // Given a target string str and a count equal to 0,
 // When the repeat 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 empty string if count is 0", () => {
+  const str = "hello";
+  const count = 0;
+  expect(repeat(str, count)).toEqual("");
+});
+
 // case: Negative Count:
 // Given a target string str and a negative integer count,
 // When the repeat 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 return error message for negative count", () => {
+  const str = "hello";
+  const count = -2;
+  expect(repeat(str, count)).toEqual("Count must be a non-negative integer");
+});