TEST(StateMachine, ramp_down)
{
StateMachine sm;
// fill up CL ring buffer first and go to restrictive state
for (unsigned i = 0; i < 100; ++i) {
sm.update(ChannelLoad(70, 100));
}
ASSERT_STREQ("Restrictive", sm.state().name());
// cool down to CL = 50%
// ring buffer: 60.0, 55.0, 52.5, 51.25, 50.625...
for (unsigned i = 0; i < 50; ++i) {
sm.update(ChannelLoad(50, 100));
}
EXPECT_STREQ("Restrictive", sm.state().name());
// ring buffer: 55.0, 52.5... -> active 5
sm.update(ChannelLoad(50, 100));
EXPECT_STREQ("Active 5", sm.state().name());
// ring buffer: 51.25, 50.625... -> active 5
sm.update(ChannelLoad(50, 100));
sm.update(ChannelLoad(50, 100));
EXPECT_STREQ("Active 5", sm.state().name());
// ring buffer: 50.625... -> active 4
sm.update(ChannelLoad(50, 100));
EXPECT_STREQ("Active 4", sm.state().name());
}
TEST(StateMachine, ctor)
{
StateMachine sm;
EXPECT_STREQ("Relaxed", sm.state().name());
EXPECT_EQ(milliseconds(60), sm.transmission_interval());
EXPECT_NEAR(16.66, sm.message_rate(), 0.01);
}
TEST(StateMachine, ramp_up)
{
StateMachine sm;
// keep below minChannelLoad at first: relaxed
sm.update(ChannelLoad(30, 100)); // smoothed: 0.15
sm.update(ChannelLoad(17, 100)); // smoothed: 0.16
EXPECT_STREQ("Relaxed", sm.state().name());
// now exceed minChannelLoad for 10 samples: active 1
sm.update(ChannelLoad(29, 100)); // smoothed: 0.225
for (unsigned i = 0; i < 8; ++i) {
sm.update(ChannelLoad(20, 100));
EXPECT_STREQ("Relaxed", sm.state().name());
}
sm.update(ChannelLoad(20, 100)); // smoothed: > 0.20
EXPECT_STREQ("Active 1", sm.state().name());
// now let's jump to active 3 directly
sm.update(ChannelLoad(54, 100)); // smoothed: 0.37
EXPECT_STREQ("Active 3", sm.state().name());
// go to restrictive state (over active 5)
sm.update(ChannelLoad(83, 100)); // smoothed: 0.60
EXPECT_STREQ("Active 5", sm.state().name());
for (unsigned i = 0; i < 8; ++i) {
sm.update(ChannelLoad(60, 100));
EXPECT_STREQ("Active 5", sm.state().name());
}
sm.update(ChannelLoad(60, 100));
EXPECT_STREQ("Restrictive", sm.state().name());
}
