Rewrite timer tests to handle timer imprecision on macOS

tests/quic/testTimeout.nim

@@ -10,42 +10,36 @@ suite "timeout":
     body
     Moment.now() - start
 
-  template checkDuration(duration, minimum: Duration, overshoot = 5.milliseconds) =
-    check duration > minimum
-    check duration < minimum + overshoot
-
   asynctest "can expire":
     let duration = measure:
       let timeout = newTimeout()
       timeout.set(10.milliseconds)
       await timeout.expired()
-    checkDuration duration, 10.milliseconds
+    check duration > 10.milliseconds
 
   asynctest "can be reset before expiry":
+    let timeout = newTimeout()
+    timeout.set(10.milliseconds)
     let duration = measure:
-      let timeout = newTimeout()
-      timeout.set(10.milliseconds)
-      await sleepAsync(5.milliseconds)
-      timeout.set(10.milliseconds)
+      timeout.set(20.milliseconds)
       await timeout.expired()
-    checkDuration duration, 15.milliseconds
+    check duration > 20.milliseconds
 
   asynctest "can be reset after expiry":
+    let timeout = newTimeout()
+    timeout.set(10.milliseconds)
+    await timeout.expired()
     let duration = measure:
-      let timeout = newTimeout()
       timeout.set(10.milliseconds)
       await timeout.expired()
-      timeout.set(10.milliseconds)
-      await timeout.expired()
-    checkDuration duration, 20.milliseconds
+    check duration > 10.milliseconds
 
   asynctest "can be stopped":
     let timeout = newTimeout()
     timeout.set(10.milliseconds)
     let expiry = timeout.expired()
-    await sleepAsync(5.milliseconds)
     timeout.stop()
-    await sleepAsync(5.milliseconds)
+    await sleepAsync(10.milliseconds)
     check not expiry.finished()
     expiry.cancel()
 
@@ -54,9 +48,8 @@ suite "timeout":
     proc callback = called = true
     let timeout = newTimeout(callback)
     timeout.set(10.milliseconds)
-    await sleepAsync(5.milliseconds)
     check not called
-    await sleepAsync(5.milliseconds)
+    await timeout.expired()
     check called
     timeout.stop()