fix: create 2 more tests for special cases and change the function so they all pass

Author: XiaoQuark

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

@@ -1,5 +1,7 @@
 function countChar(stringOfCharacters, findCharacter) {
-  const charRegex = new RegExp(findCharacter, "g");
+  const metaCharRegex = /[.^$*+?{}\[\]\\|()]/g;
+  const safeChar = findCharacter.replace(metaCharRegex, `\\$&`);
+  const charRegex = new RegExp(safeChar, "g");
   const charArr = [...stringOfCharacters.matchAll(charRegex)];
   return charArr.length;
 }

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

@@ -29,3 +29,19 @@ test("should count 0 occurrences of a character", () => {
   const count = countChar(str, char);
   expect(count).toEqual(0);
 });
+
+test("should be case sensitive and return only occurrences of same case characters", () => {
+  const str = "Dodgers";
+  const char = "D";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should count occurrences of regex metacharacters", () => {
+  const str = "a*b*c";
+  const char = "*";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+
+// metacharacters . ^ $ * + ? { } [ ] \ | ( )