test: add comprehensive AbortSignal.any() test coverage

test/js/web/abort/abort-signal-any.test.ts

@@ -0,0 +1,204 @@
+import { describe, expect, test } from "bun:test";
+
+/**
+ * Comprehensive tests for AbortSignal.any()
+ * 
+ * AbortSignal.any() creates a composite signal that aborts when any of the
+ * provided signals abort. This test suite covers edge cases and ensures
+ * standards-compliant behavior.
+ */
+describe("AbortSignal.any()", () => {
+    describe("basic functionality", () => {
+        test("should return a non-aborted signal for empty array", () => {
+            // @ts-ignore - TypeScript may not have this typed
+            const signal = AbortSignal.any([]);
+            expect(signal).toBeInstanceOf(AbortSignal);
+            expect(signal.aborted).toBe(false);
+        });
+
+        test("should follow a single signal", () => {
+            const controller = new AbortController();
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal]);
+
+            expect(composite.aborted).toBe(false);
+            controller.abort();
+            expect(composite.aborted).toBe(true);
+        });
+
+        test("should abort when any of multiple signals abort", () => {
+            const controller1 = new AbortController();
+            const controller2 = new AbortController();
+            const controller3 = new AbortController();
+
+            // @ts-ignore
+            const composite = AbortSignal.any([
+                controller1.signal,
+                controller2.signal,
+                controller3.signal
+            ]);
+
+            expect(composite.aborted).toBe(false);
+            controller2.abort("middle signal aborted");
+            expect(composite.aborted).toBe(true);
+        });
+    });
+
+    describe("already-aborted signals", () => {
+        test("should immediately abort if any input signal is already aborted", () => {
+            const abortedController = new AbortController();
+            abortedController.abort("pre-aborted");
+
+            const freshController = new AbortController();
+
+            // @ts-ignore
+            const composite = AbortSignal.any([
+                freshController.signal,
+                abortedController.signal
+            ]);
+
+            expect(composite.aborted).toBe(true);
+        });
+
+        test("should use AbortSignal.abort() result correctly", () => {
+            const alreadyAborted = AbortSignal.abort("already aborted reason");
+            const controller = new AbortController();
+
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal, alreadyAborted]);
+
+            expect(composite.aborted).toBe(true);
+            expect(composite.reason).toBe("already aborted reason");
+        });
+
+        test("should work with all signals already aborted", () => {
+            const aborted1 = AbortSignal.abort("first");
+            const aborted2 = AbortSignal.abort("second");
+
+            // @ts-ignore
+            const composite = AbortSignal.any([aborted1, aborted2]);
+
+            expect(composite.aborted).toBe(true);
+            // First aborted signal's reason should be used
+            expect(composite.reason).toBe("first");
+        });
+    });
+
+    describe("reason propagation", () => {
+        // Table-driven tests for different reason types per coderabbitai suggestion
+        const reasonCases = [
+            { name: "Error", reason: new Error("custom abort reason") },
+            { name: "string", reason: "string reason" },
+            { name: "object", reason: { code: 42, message: "custom object" } },
+        ];
+
+        test.each(reasonCases)("should propagate $name reasons", ({ reason }) => {
+            const controller = new AbortController();
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal]);
+            controller.abort(reason);
+            expect(composite.reason).toBe(reason);
+        });
+
+        test("should use DOMException for default abort reason", () => {
+            const controller = new AbortController();
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal]);
+
+            controller.abort();
+
+            expect(composite.reason).toBeInstanceOf(DOMException);
+            expect(composite.reason.name).toBe("AbortError");
+        });
+    });
+
+    describe("event handling", () => {
+        test("should fire abort event when composite aborts", async () => {
+            const { promise, resolve } = Promise.withResolvers<boolean>();
+
+            const controller = new AbortController();
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal]);
+
+            composite.addEventListener("abort", () => resolve(true));
+
+            // Abort fires synchronously, so the event listener is called before abort() returns
+            controller.abort();
+
+            const result = await promise;
+            expect(result).toBe(true);
+        });
+
+        test("should only fire abort event once even with multiple source aborts", async () => {
+            let abortCount = 0;
+
+            const controller1 = new AbortController();
+            const controller2 = new AbortController();
+
+            // @ts-ignore
+            const composite = AbortSignal.any([controller1.signal, controller2.signal]);
+
+            composite.addEventListener("abort", () => abortCount++);
+
+            controller1.abort();
+            controller2.abort();
+
+            // Wait a tick to ensure all events have fired
+            await Bun.sleep(10);
+
+            expect(abortCount).toBe(1);
+        });
+    });
+
+    describe("nested AbortSignal.any()", () => {
+        test("should work with nested any() calls", () => {
+            const controller1 = new AbortController();
+            const controller2 = new AbortController();
+            const controller3 = new AbortController();
+
+            // @ts-ignore
+            const nested = AbortSignal.any([controller1.signal, controller2.signal]);
+            // @ts-ignore
+            const composite = AbortSignal.any([nested, controller3.signal]);
+
+            expect(composite.aborted).toBe(false);
+
+            controller2.abort("from nested");
+
+            expect(nested.aborted).toBe(true);
+            expect(composite.aborted).toBe(true);
+            expect(composite.reason).toBe("from nested");
+        });
+    });
+
+    describe("with AbortSignal.timeout()", () => {
+        test("should work with timeout signals", async () => {
+            const controller = new AbortController();
+            const timeoutSignal = AbortSignal.timeout(50);
+
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal, timeoutSignal]);
+
+            expect(composite.aborted).toBe(false);
+
+            await Bun.sleep(100);
+
+            expect(composite.aborted).toBe(true);
+            expect(composite.reason).toBeInstanceOf(DOMException);
+            expect(composite.reason.name).toBe("TimeoutError");
+        });
+
+        test("should prefer manual abort over timeout if it comes first", async () => {
+            const controller = new AbortController();
+            const timeoutSignal = AbortSignal.timeout(1000);
+
+            // @ts-ignore
+            const composite = AbortSignal.any([controller.signal, timeoutSignal]);
+
+            controller.abort("manual abort");
+
+            expect(composite.aborted).toBe(true);
+            expect(composite.reason).toBe("manual abort");
+        });
+    });
+});