fix: correctly detect global testing framework

Author: thebuilder

src/__tests__/setup.test.ts

@@ -1,12 +1,16 @@
 import { vi } from "vitest";
-import { mockAllIsIntersecting } from "../test-utils";
+import { mockAllIsIntersecting, setupIntersectionMocking } from "../test-utils";
 
 vi.hoisted(() => {
   // Clear the `vi` from global, so we can detect if this is a test env
   // @ts-ignore
   window.vi = undefined;
 });
 
+afterEach(() => {
+  vi.resetAllMocks();
+});
+
 test("should warn if not running in test env", () => {
   vi.spyOn(console, "error").mockImplementation(() => {});
   mockAllIsIntersecting(true);
@@ -26,3 +30,10 @@ afterEach(() => {
   resetIntersectionMocking();
 });`);
 });
+
+test('should not warn if running in test env with global "vi"', () => {
+  vi.spyOn(console, "error").mockImplementation(() => {});
+  setupIntersectionMocking(vi.fn);
+  mockAllIsIntersecting(true);
+  expect(console.error).not.toHaveBeenCalled();
+});

src/test-utils.ts

@@ -34,6 +34,16 @@ function isMocking() {
   if (util && typeof util.isMockFunction === "function") {
     return util.isMockFunction(window.IntersectionObserver);
   }
+
+  // No global test utility found. Check if the IntersectionObserver was manually mocked.
+  if (
+    typeof window !== "undefined" &&
+    window.IntersectionObserver &&
+    "mockClear" in window.IntersectionObserver
+  ) {
+    return true;
+  }
+
   return false;
 }