add unit test for serialize

test/serialize.test.js

@@ -0,0 +1,77 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import serialize from "../lib/serialize.js";
+
+test("serialize should work on simple object", () => {
+  const output = serialize({
+    assumptions: {
+      arrayLikeIsIterable: true,
+      constantReexports: false,
+    },
+    presets: ["@babel/preset-env", "@babel/preset-react"],
+  });
+  assert.strictEqual(
+    output,
+    `{,"assumptions":{,"arrayLikeIsIterable":!0,"constantReexports":!1},"presets":[@babel/preset-env,@babel/preset-react]}`,
+  );
+});
+
+test("serialize should sort object keys", () => {
+  const output1 = serialize({ a: "a", b: "b", c: "c" });
+  const output2 = serialize({ c: "c", b: "b", a: "a" });
+  assert.strictEqual(output1, `{,"a":a,"b":b,"c":c}`);
+  assert.strictEqual(output2, `{,"a":a,"b":b,"c":c}`);
+});
+
+test("serialize should respect toJSON method", () => {
+  const output = serialize({
+    plugins: [
+      {
+        toJSON() {
+          return "custom plugins";
+        },
+      },
+    ],
+  });
+  assert.strictEqual(output, `{,"plugins":[custom plugins]}`);
+});
+
+test("serialize should support numbers and NaN", () => {
+  const output = serialize({
+    plugins: [["custom plugin", { number: 2, NaN: NaN }]],
+  });
+  assert.strictEqual(
+    output,
+    `{,"plugins":[[custom plugin,{,"NaN":null,"number":2}]]}`,
+  );
+});
+
+test("serialize should support nullish values", () => {
+  const output = serialize({
+    plugins: [
+      [
+        "custom plugin",
+        {
+          null: null,
+          undefined: undefined,
+          arrayNull: [null],
+          arrayUndefined: [undefined],
+        },
+      ],
+    ],
+  });
+  assert.strictEqual(
+    output,
+    `{,"plugins":[[custom plugin,{,"arrayNull":[null],"arrayUndefined":[null],"null":null}]]}`,
+  );
+});
+
+test("serialize should support set", () => {
+  const output = serialize({
+    plugins: ["custom plugin", [{ visitNodeTypes: new Set(["Identifier"]) }]],
+  });
+  assert.strictEqual(
+    output,
+    `{,"plugins":[custom plugin,[{,"visitNodeTypes":{}}]]}`,
+  );
+});