1 files changed, 39 insertions, 0 deletions
diff --git a/preact/compat/test/browser/scheduler.test.js b/preact/compat/test/browser/scheduler.test.js
new file mode 100644
index 0000000..fdb426d
--- /dev/null
+++ b/preact/compat/test/browser/scheduler.test.js
@@ -0,0 +1,39 @@
+import {
+	unstable_runWithPriority,
+	unstable_NormalPriority,
+	unstable_LowPriority,
+	unstable_IdlePriority,
+	unstable_UserBlockingPriority,
+	unstable_ImmediatePriority,
+	unstable_now
+} from 'preact/compat/scheduler';
+
+describe('scheduler', () => {
+	describe('runWithPriority', () => {
+		it('should call callback ', () => {
+			const spy = sinon.spy();
+			unstable_runWithPriority(unstable_IdlePriority, spy);
+			expect(spy.callCount).to.equal(1);
+
+			unstable_runWithPriority(unstable_LowPriority, spy);
+			expect(spy.callCount).to.equal(2);
+
+			unstable_runWithPriority(unstable_NormalPriority, spy);
+			expect(spy.callCount).to.equal(3);
+
+			unstable_runWithPriority(unstable_UserBlockingPriority, spy);
+			expect(spy.callCount).to.equal(4);
+
+			unstable_runWithPriority(unstable_ImmediatePriority, spy);
+			expect(spy.callCount).to.equal(5);
+		});
+	});
+
+	describe('unstable_now', () => {
+		it('should return number', () => {
+			const res = unstable_now();
+			expect(res).is.a('number');
+			expect(res > 0).to.equal(true);
+		});
+	});
+});