Add more test cases

Author: sxwei123

test/str.spec.ts test/object.spec.tstest/str.spec.ts renamed to test/object.spec.ts

@@ -1,5 +1,9 @@
 import stringify from "../src";
 
+test("empty object", () => {
+  expect(stringify({})).toEqual("{}");
+});
+
 test("simple object", () => {
   const obj = { c: 6, b: [4, 5], a: 3, z: null };
   expect(stringify(obj)).toEqual('{"a":3,"b":[4,5],"c":6,"z":null}');
@@ -30,7 +34,38 @@ test("object with empty string", () => {
   expect(stringify(obj)).toEqual('{"a":3,"z":""}');
 });
 
+test("object with Symbol", () => {
+  const obj = { a: 12, z: Symbol("") };
+  expect(stringify(obj)).toEqual('{"a":12}');
+});
+
+test("non-enumerable properties", () => {
+  const obj = Object.create(null, {
+    x: { value: "x", enumerable: false },
+    y: { value: "y", enumerable: true },
+  });
+  expect(stringify(obj)).toEqual('{"y":"y"}');
+});
+
 test("array with empty string", () => {
   const obj = [4, "", 6];
   expect(stringify(obj)).toEqual('[4,"",6]');
 });
+
+test("simple function", () => {
+  const obj = () => {
+    // empty
+  };
+  expect(stringify(obj)).toEqual(undefined);
+});
+
+test("standard data structures", () => {
+  expect(
+    stringify([
+      new Set([1]),
+      new Map([[1, 2]]),
+      new WeakSet([{ a: 1 }]),
+      new WeakMap([[{ a: 1 }, 2]]),
+    ])
+  ).toEqual("[{},{},{},{}]");
+});

test/primitive.spec.ts

@@ -0,0 +1,29 @@
+import stringify from "../src";
+
+test("undefined", () => {
+  expect(stringify(undefined)).toEqual(undefined);
+});
+
+test("true", () => {
+  expect(stringify(true)).toEqual("true");
+});
+
+test("string", () => {
+  expect(stringify("foo")).toEqual(`"foo"`);
+});
+
+test("symbol", () => {
+  expect(stringify(Symbol(""))).toEqual(undefined);
+});
+
+test("NaN", () => {
+  expect(stringify(NaN)).toEqual("null");
+});
+
+test("Infinity", () => {
+  expect(stringify(Infinity)).toEqual("null");
+});
+
+test("null", () => {
+  expect(stringify(null)).toEqual("null");
+});