Implement a countChar function and test with jest

Author: AhmadHmedann

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

@@ -1,5 +1,24 @@
 function countChar(stringOfCharacters, findCharacter) {
-  return 5
+ let counter=0;
+ let index=stringOfCharacters.indexOf(findCharacter);
+ while(index!== -1)
+ {
+  counter++;
+ 
+  index = stringOfCharacters.indexOf(findCharacter,index+1);
+ }
+ return counter;
 }
 
 module.exports = countChar;
+function assertFunction(currentOutput,targetOutput)
+{
+  console.assert(currentOutput===targetOutput,
+    `expect ${currentOutput} to equal ${targetOutput}`
+  );
+}
+assertFunction(countChar("Ahmaaa hmaaa",'a'),6);
+assertFunction(countChar("Ahmaaa hmaaa",'m'),2 );
+assertFunction(countChar("Ahmaaa hmaaa",'b'),0);
+assertFunction(countChar("Ahmaaa hmaaa",'A'),1);
+assertFunction(countChar("",'A'),0);

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

@@ -22,3 +22,22 @@ test("should count multiple occurrences of a character", () => {
 // And a character char that does not exist within the case-sensitive str,
 // When the function is called with these inputs,
 // Then it should return 0, indicating that no occurrences of the char were found in the case-sensitive str.
+test("should return 0  occurrences of b characters ",()=>{
+  const str="Ahmad Hmedan";
+  const char= "b";
+  const count=countChar(str,char);
+  expect(count).toEqual(0);
+})
+
+test("should return 1 occurrence of A characters",()=>{
+  const str = "Ahmad Hmedan";
+  const char = "A";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+})
+test("should return 2 occurrence of m characters",()=>{
+  const str = "Ahmad Hmedan";
+  const char = "m";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+})