Add test case to verify countChar returns 0 for non-existent character

Author: alexandru-pocovnicu

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

@@ -22,3 +22,10 @@ test("should count multiple occurrences of a character", () => {
 // 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 occurence", () => {
+  const str = "asdf";
+  const char = "l";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
+});