test: add test for loader

description is missing

test/fixtures/config.ts

@@ -0,0 +1,7 @@
+export const config = {
+  /** checked status */
+  checked: {
+    $default: false,
+    $schema: { deprecated: "use unchecked" },
+  },
+};

test/loader.test.ts

@@ -0,0 +1,39 @@
+import { describe, it, expect } from "vitest";
+import { loadSchema } from "../src/loader/loader";
+
+describe("loader", () => {
+  it("should load a schema", async () => {
+    const schema = await loadSchema("./test/fixtures/config.ts", {});
+    expect(schema).toMatchInlineSnapshot(`
+      {
+        "default": {
+          "config": {
+            "checked": false,
+          },
+        },
+        "id": "#",
+        "properties": {
+          "config": {
+            "default": {
+              "checked": false,
+            },
+            "id": "#config",
+            "properties": {
+              "checked": {
+                "default": false,
+                "deprecated": "use unchecked",
+                "description": "",
+                "id": "#config/checked",
+                "tags": [],
+                "title": "",
+                "type": "boolean",
+              },
+            },
+            "type": "object",
+          },
+        },
+        "type": "object",
+      }
+    `);
+  });
+});