querystring.test.js

// In the prep, we implemented a function to parse query strings.
// Unfortunately, it contains several bugs!
// 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")


test("parses querystring values containing =", () => {
  expect(parseQueryString("equation=x=y+1")).toEqual({
    "equation": "x=y+1",
  });
});

test("parses empty querystring as empty object", () => {
  expect(parseQueryString("")).toEqual({});
});

test("parses single key with empty value", () => {
  expect(parseQueryString("flag=")).toEqual({ flag: "" });
});

test("parses key with no =", () => {
  expect(parseQueryString("flag")).toEqual({ flag: "" });
});

test("parses multiple key value pairs", () => {
  expect(parseQueryString("a=1&b=2")).toEqual({ a: "1", b: "2" });
});

test("later duplicate keys overwrite earlier ones", () => {
  expect(parseQueryString("a=1&a=2")).toEqual({ a: "2" });
});