count.test.js

// implement a function countChar that counts the number of times a character occurs in a string

function countChar(str, char) {
  let index = 0;
  for (let i = 0; i < str.length; i++) {
    if (str[i] === char) {
      index++;
    }
    while (str[i + 1] === char) {
      i++;
      index++;
    }
  }
  return index;
}
test("This will check consecutive occurrences or no occurrences of a given character", function () {
  expect(countChar("asad", "s")).toBe(1);
  expect(countChar("assa", "s")).toBe(2);
  expect(countChar("aaad", "s")).toBe(0);
  expect(countChar("asssssd", "s")).toBe(5);
});
// Given a string str and a single character char to search for,
// When the countChar function is called with these inputs,
// Then it should:

// Scenario: Multiple Occurrences
// Given the input string str,
// And a character char that may occur multiple times with overlaps within str (e.g., 'a' in 'aaaaa'),
// When the function is called with these inputs,
// Then it should correctly count consecutive occurrences of char (e.g., 'a' appears five times in 'aaaaa').

// Scenario: No Occurrences
// Given the input string str,
// 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