feat: reject token if it's not valid

src/libs/lazy.spec.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from "bun:test";
+
+import { lazy } from "./lazy";
+
+describe("lazy", () => {
+  it("lazy value returned when get is called", () => {
+    const value = lazy(() => "value");
+
+    expect(value.get()).toBe("value");
+  });
+
+  it("lazy function not called if get isn't called", () => {
+    let setValue = false;
+    lazy(() => {
+      setValue = true;
+      return "value";
+    });
+
+    expect(setValue).toBeFalse();
+  });
+
+  it("lazy function called if get is called", () => {
+    let setValue = false;
+    lazy(() => {
+      setValue = true;
+      return "value";
+    }).get();
+
+    expect(setValue).toBeTrue();
+  });
+
+  it("lazy function called only once if get is called multiple times", () => {
+    let count = 0;
+    const value = lazy(() => {
+      count++;
+      return "value";
+    });
+    const NUM_TIMES_CALLED = 1_000_000;
+    for (let i = 0; i < NUM_TIMES_CALLED; i++) {
+      value.get();
+    }
+
+    expect(count).toBe(1);
+  });
+});