chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/durable/src/testing/assertions.ts

@@ -0,0 +1,39 @@
+import type { StorageConformanceAssertions } from "./types.ts";
+
+export type ExpectLike = (actual: unknown, message?: string) => unknown;
+
+type ExpectResult = {
+	toBe(expected: unknown): unknown;
+	toBeGreaterThan(expected: number): unknown;
+	toEqual(expected: unknown): unknown;
+	toMatchObject(expected: unknown): unknown;
+	toBeTruthy(): unknown;
+	readonly rejects: {
+		toThrow(expected?: string | RegExp): unknown;
+	};
+};
+
+/** Adapts a Vitest/Jest-compatible `expect` function without importing either runner. */
+export function createExpectAssertions(expect: ExpectLike): StorageConformanceAssertions {
+	const result = (actual: unknown, message?: string): ExpectResult => expect(actual, message) as ExpectResult;
+	return {
+		ok(value, message) {
+			result(value, message).toBeTruthy();
+		},
+		strictEqual(actual, expected) {
+			result(actual).toBe(expected);
+		},
+		deepEqual(actual, expected) {
+			result(actual).toEqual(expected);
+		},
+		partialDeepEqual(actual, expected) {
+			result(actual).toMatchObject(expected);
+		},
+		greaterThan(actual, expected) {
+			result(actual).toBeGreaterThan(expected);
+		},
+		async rejects(operation, messageIncludes) {
+			await result(operation).rejects.toThrow(messageIncludes);
+		},
+	};
+}