Add count tests for partial matches and empty string

Author: lwandogwele52-ui

practice-tdd/count.test.js

@@ -27,4 +27,32 @@ test("should return 0 when the character does not occur in the string", () => {
   const char = "z";
   const count = countChar(str, char);
   expect(count).toEqual(0);
+});
+
+test("should count correctly when the character appears in only part of the string", () => {
+  const str = "hello";
+  const char = "l";
+  const count = countChar(str, char);
+  expect(count).toEqual(2);
+});
+
+test("should count a character that appears once in the middle of the string", () => {
+  const str = "abc";
+  const char = "b";
+  const count = countChar(str, char);
+  expect(count).toEqual(1);
+});
+
+test("should count a character that appears in separate parts of the string", () => {
+  const str = "banana";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(3);
+});
+
+test("should return 0 when the string is empty", () => {
+  const str = "";
+  const char = "a";
+  const count = countChar(str, char);
+  expect(count).toEqual(0);
 });