1 files changed, 6 insertions, 6 deletions
diff --git a/pbt/ts/src/property.test.ts b/pbt/ts/src/property.test.ts
index 920457a..addff34 100644
--- a/pbt/ts/src/property.test.ts
+++ b/pbt/ts/src/property.test.ts
@@ -7,18 +7,18 @@ import {
 } from './property';
 
 // from https://github.com/jlink/shrinking-challenge/blob/main/challenges/difference.md
-const predicate1: (pair: [number, number]) => boolean = ([x, y]) =>
-  x < 10 || x !== y;
+const predicate1: (pair: [number, number]) => Promise<boolean> = ([x, y]) =>
+  Promise.resolve(x < 10 || x !== y);
 
 describe('Find minimal counterexample', () => {
-  test('do not shrink example if no shrinker given', () => {
-    const result = property(pairOf(positiveInt), predicate1)(42, 1);
+  test('do not shrink example if no shrinker given', async () => {
+    const result = await property(pairOf(positiveInt), predicate1)(42, 1);
     expect(result.result).toBe('Falsified');
     expect(result.counterexample).toBeNull;
   });
 
-  test('shrink example if shrinker given', () => {
-    const result = property(
+  test('shrink example if shrinker given', async () => {
+    const result = await property(
       pairOf(positiveInt),
       predicate1,
       shrinkPair(shrinkPositive, shrinkPositive),