count.test.js

// implement a function countChar that counts the number of times a character occurs in a string
const countChar = require("./count");
// 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 occurs one or more times in `str` (e.g., 'a' in 'aaaaa'),
// When the function is called with these inputs,
// Then it should correctly count occurrences of `char`.

test("should count multiple occurrences of a character", () => {
  const str = "aaaaa";
  const char = "a";
  const count = countChar(str, char);
  expect(count).toEqual(5);
});

// Scenario: No Occurrences
// Given the input string `str`,
// And a character `char` that does not exist within `str`.
// When the function is called with these inputs,
// Then it should return 0, indicating that no occurrences of `char` were found.
test(`should return 0 for no occurances of 'char' in 'str'`, () => {
  const str = "code your future";
  const char = "x";
  const count = countChar(str, char);
  expect(count).toEqual(0);
})

test(`in case sensitive case, should also return the number of character in the string`, () => {
  expect(countChar("Code Your Future!", "y")).toEqual(1);
});

test(`should return the count of character for non-alphabests`, () => {
  expect(countChar("86421", "1")).toEqual(1);
});

test(`should return 0 for empty strings`, () => {
  expect(countChar("code your future", "")).toEqual(0)
});

test(`should return the count for special characters`, () => {
  expect(countChar("code& $future £your", "$")).toEqual(1)
})