[test] unit test for new MockForward scheduler method

Author: amitiuttarwar

src/test/scheduler_tests.cpp

@@ -5,8 +5,6 @@
 #include <random.h>
 #include <scheduler.h>
 
-#include <test/util/setup_common.h>
-
 #include <boost/thread.hpp>
 #include <boost/test/unit_test.hpp>
 
@@ -155,4 +153,45 @@ BOOST_AUTO_TEST_CASE(singlethreadedscheduler_ordered)
     BOOST_CHECK_EQUAL(counter2, 100);
 }
 
+BOOST_AUTO_TEST_CASE(mockforward)
+{
+    CScheduler scheduler;
+
+    int counter{0};
+    CScheduler::Function dummy = [&counter]{counter++;};
+
+    // schedule jobs for 2, 5 & 8 minutes into the future
+    int64_t min_in_milli = 60*1000;
+    scheduler.scheduleFromNow(dummy, 2*min_in_milli);
+    scheduler.scheduleFromNow(dummy, 5*min_in_milli);
+    scheduler.scheduleFromNow(dummy, 8*min_in_milli);
+
+    // check taskQueue
+    boost::chrono::system_clock::time_point first, last;
+    size_t num_tasks = scheduler.getQueueInfo(first, last);
+    BOOST_CHECK_EQUAL(num_tasks, 3ul);
+
+    std::thread scheduler_thread([&]() { scheduler.serviceQueue(); });
+
+    // bump the scheduler forward 5 minutes
+    scheduler.MockForward(boost::chrono::seconds(5*60));
+
+    // ensure scheduler has chance to process all tasks queued for before 1 ms from now.
+    scheduler.scheduleFromNow([&scheduler]{ scheduler.stop(false); }, 1);
+    scheduler_thread.join();
+
+    // check that the queue only has one job remaining
+    num_tasks = scheduler.getQueueInfo(first, last);
+    BOOST_CHECK_EQUAL(num_tasks, 1ul);
+
+    // check that the dummy function actually ran
+    BOOST_CHECK_EQUAL(counter, 2);
+
+    // check that the time of the remaining job has been updated
+    boost::chrono::system_clock::time_point now = boost::chrono::system_clock::now();
+    int delta = boost::chrono::duration_cast<boost::chrono::seconds>(first - now).count();
+    // should be between 2 & 3 minutes from now
+    BOOST_CHECK(delta > 2*60 && delta < 3*60);
+}
+
 BOOST_AUTO_TEST_SUITE_END()