test: add test for null and empty deferredPromises.

rzvxa · Jan 2, 2024 · 5dbac24 · 5dbac24
1 parent c78f59c
commit 5dbac24
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/tests/dwait.spec.ts b/tests/dwait.spec.ts
@@ -157,6 +157,17 @@ describe("dwait Tests", () => {
     const dwaitPromise2 = dwait(resolveClass());
     expect(dwaitPromise1).toBe(dwaitPromise1);
   });
+
+  test("should throw on accessing properties on null or undefined deferred operations", async () => {
+    const nullPromise = dwait(null)[NUMBER];
+    const undefinedPromise = dwait(undefined)[NUMBER];
+    await expect(nullPromise).rejects.toEqual(
+      new RangeError(`Property ${NUMBER} does not exists on null.`)
+    );
+    await expect(undefinedPromise).rejects.toEqual(
+      new RangeError(`Property ${NUMBER} does not exists on undefined.`)
+    );
+  });
 });
 
 describe("isDeferredPromise Tests", () => {