Fix flaky test.

Summary: Flakyness was caused by a small chance that the function would still be in the heap when adding a function. Increased delay to 3 seconds.

Reviewed By: yfeldblum

Differential Revision: D6855408

fbshipit-source-id: 47d4035698a5d14a7ed71902656210f0e17b0b5d

folly/experimental/test/FunctionSchedulerTest.cpp

@@ -264,7 +264,7 @@ TEST(FunctionScheduler, ResetFunc2) {
   fs.addFunctionOnce([&] { total += 3; }, "add6", testInterval(2));
   delay(1);
   EXPECT_TRUE(fs.resetFunctionTimer("add4"));
-  delay(2);
+  delay(3);
   EXPECT_FALSE(fs.resetFunctionTimer("add3"));
   fs.addFunctionOnce([&] { total += 3; }, "add4", testInterval(1));
 }