repeat task is done

Author: shaghayeghfar

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

@@ -1,12 +1,29 @@
 function repeat(str, count) {
-  if (count < 0) {
+  if (str === undefined) {
+    throw new Error("String must be defined");
+  }
+  if (str === null || typeof str !== "string") {
+    throw new Error("String must be a valid string");
+  }
+
+  if (count === undefined || typeof count !== "number") {
+    throw new Error("Count must be a number");
+  }
+
+  if (count < 0 || !Number.isInteger(count)) {
     throw new Error("Count must be a non-negative integer");
   }
 
+  if (str === "" || count === 0) {
+    return "";
+  }
+
+  // 5. Repeat the string count times
   let result = "";
   for (let i = 0; i < count; i++) {
     result += str;
   }
+
   return result;
 }
 

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

@@ -51,3 +51,38 @@ test("should throw an error when count is negative", () => {
     "Count must be a non-negative integer"
   );
 });
+
+// case: Undefined String
+// Given that str is undefined and count is a positive integer,
+// When the repeat function is called with these inputs,
+// Then it should throw an error or return an appropriate message,
+// since repeating an undefined value does not make sense.
+
+test("should throw an error when string is undefined", () => {
+  const str = undefined;
+  const count = 2;
+  expect(() => repeat(str, count)).toThrow("String must be defined");
+});
+
+// case: Empty String
+// Given an empty string str and a positive integer count,
+// When the repeat function is called,
+// Then it should return an empty string, since there is nothing to repeat.
+
+test("should return an empty string when input string is empty", () => {
+  const str = "";
+  const count = 3;
+  const repeatedStr = repeat(str, count);
+  expect(repeatedStr).toEqual("");
+});
+
+// case: Null String
+// Given that str is null and count is a positive integer,
+// When the repeat function is called,
+// Then it should throw an error, because null is not a valid string input.
+
+test("should throw an error when string is null", () => {
+  const str = null;
+  const count = 2;
+  expect(() => repeat(str, count)).toThrow("String must be a valid string");
+});