test: add cases for count of 0 and negative count in repeatStr function

Author: Grajales-K

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

@@ -4,6 +4,8 @@ const repeatStr = require("./repeat-str");
 // When the repeatStr function is called with these inputs,
 // Then it should:
 
+// Clean Code example, Gherkin style (Given/When/Then)
+
 // Case: handle multiple repetitions:
 // Given a target string `str` and a positive integer `count` greater than 1,
 // When the repeatStr function is called with these inputs,
@@ -20,13 +22,38 @@ test("should repeat the string count times", () => {
 // Given a target string `str` and a `count` equal to 1,
 // When the repeatStr function is called with these inputs,
 // Then it should return the original `str` without repetition.
+test("Should return the original string if count is 1", () => {
+  expect(repeatStr("singleStf", 1)).toBe("singleStf");
+});
+
 
 // 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.
+test("Should return an empty string if the count is 0", () => {
+  expect(repeatStr("hello", 0)).toBe("");
+});
 
 // Case: Handle 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, as negative counts are not valid.
+test("Should throw an error if the count is negative", () => {
+  expect(() => repeatStr("hi", -3)).toThrow();
+});
+
+function repeatStr(str, count) {
+  if (count < 0) {
+    throw new Error("count cannot be negative");
+  }
+  if (count === 1) return str;
+
+  let result = "";
+  for (let i = 0; i < count; i++) {
+    result = result + str;
+  }
+  return result;
+}
+
+module.exports = repeatStr;