Add comprehensive tests for repeatStr function

Author: arunkumarakilan

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

@@ -1,5 +1,26 @@
-function repeatStr() {
-  return "hellohellohello";
+function repeatStr(str, count) {
+  if (count <0)
+  {
+  throw new Error("negative counts are not valid");
+  }
+  else if(count === 1)
+  {
+    return str;
+  }
+  else if (count === 0)
+  {
+    return "";
+  }
+  else 
+  {
+    let result ="";
+    for (let i =0; i<count;i++)
+    {
+
+      result =result+str;
+    }
+    return result;
+  }
 }
 
 module.exports = repeatStr;

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

@@ -12,8 +12,23 @@ const repeatStr = require("./repeat-str");
 test("should repeat the string count times", () => {
   const str = "hello";
   const count = 3;
-  const repeatedStr = repeatStr(str, count);
-  expect(repeatedStr).toEqual("hellohellohello");
+  expect(repeatStr(str,count)).toEqual("hellohellohello");
+});
+test(" should return original 'str' without repetition", ()=>{
+  const str = "hello";
+  const count = 1;
+  expect(repeatStr(str, count)).toEqual("hello");
+});
+test("should return empty string", ()=>{
+  const str = "hello";
+  const count = 0;
+  expect(repeatStr(str, count)).toEqual("");
+
+});
+test("should throw negative counts are not valid Error", ()=>{
+const str = "hello";
+  const count = -1;
+  expect(()=> repeatStr(str, count)).toThrow();
 });
 
 // Case: handle count of 1: