test: added edge case tests for parseQueryString and fixed typo in age value

Author: Eugenie-A

Sprint-2/implement/querystring.test.js

@@ -3,10 +3,58 @@
 // Below is one test case for an edge case the implementation doesn't handle well.
 // Fix the implementation for this test, and try to think of as many other edge cases as possible - write tests and fix those too.
 
-const parseQueryString = require("./querystring.js")
+const parseQueryString = require("./querystring.js");
 
 test("parses querystring values containing =", () => {
   expect(parseQueryString("equation=x=y+1")).toEqual({
-    "equation": "x=y+1",
+    equation: "x=y+1",
+  });
+});
+
+test("handles multiple parameters", () => {
+  expect(parseQueryString("name=Alex&age=25&city=London")).toEqual({
+    name: "Alex",
+    age: "25",
+    city: "London",
+  });
+});
+
+test("handles empty value (key=)", () => {
+  expect(parseQueryString("search=&page=3")).toEqual({
+    search: "",
+    page: "3",
+  });
+});
+
+test("handles key without value", () => {
+  expect(parseQueryString("debug&sort=asc")).toEqual({
+    debug: "",
+    sort: "asc",
+  });
+});
+
+test("handles leading question mark", () => {
+  expect(parseQueryString("?q=javascript&lang=en")).toEqual({
+    q: "javascript",
+    lang: "en",
+  });
+});
+
+test("returns empty object when input is empty or just ?", () => {
+  expect(parseQueryString("")).toEqual({});
+  expect(parseQueryString("?")).toEqual({});
+});
+
+test("ignores trailing &", () => {
+  expect(parseQueryString("a=1&b=2&")).toEqual({
+    a: "1",
+    b: "2",
+  });
+});
+
+test("ignores repeated &", () => {
+  expect(parseQueryString("x=10&&y=20")).toEqual({
+    x: "10",
+    y: "20",
   });
 });