1 files changed, 11 insertions, 0 deletions

diff --git a/spec/time_spec.lua b/spec/time_spec.lua
index c9d3d6d..e1b457a 100644
--- a/spec/time_spec.lua
+++ b/spec/time_spec.lua
@@ -12,9 +12,20 @@ describe('Test time functions', function()
     assert.is_near(expected, avg, 1 + delta)
   end)
 
+  it('monottime returns monotonically increasing time', function()
+    local starttime = system.monotime()
+    local endtime = system.monotime()
+    local delta = endtime - starttime
+    assert.is_true(starttime > 0)
+    assert.is_true(delta >= 0)
+    assert.is_true(system.monotime() - endtime >= 0)
+  end)
+
   it('sleep will wait for specified amount of time', function()
     local starttime = system.gettime()
+    local starttick = system.monotime()
     system.sleep(0.5)
     assert.is_near(0.5, system.gettime() - starttime, 0.1)
+    assert.is_near(0.5, system.monotime() - starttick, 0.1)
   end)
 end)