1 files changed, 77 insertions, 0 deletions

diff --git a/spec/01-time_spec.lua b/spec/01-time_spec.lua
new file mode 100644
index 0000000..80faa75
--- /dev/null
+++ b/spec/01-time_spec.lua
@@ -0,0 +1,77 @@
+local system = require 'system.core'
+
+describe('Test time functions', function()
+
+  -- returns the new second, on the new second
+  local function wait_for_second_rollover()
+    local start_time = math.floor(os.time())
+    local end_time = math.floor(os.time())
+    while end_time == start_time do
+      end_time = math.floor(os.time())
+    end
+    return end_time
+  end
+
+
+  describe("time()", function()
+
+    it('returns current time', function()
+      wait_for_second_rollover()
+      local expected_time = wait_for_second_rollover()
+      local received_time = system.gettime()
+      assert.is.near(expected_time, received_time, 0.02)
+
+      wait_for_second_rollover()
+      assert.is.near(1, system.gettime() - received_time, 0.02)
+    end)
+
+  end)
+
+
+
+  describe("monotime()", function()
+
+    it('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)
+
+  end)
+
+
+
+  describe("sleep()", function()
+
+    it("should sleep for the specified time", function()
+      local start_time = system.gettime()
+      system.sleep(1, 1)
+      local end_time = system.gettime()
+      local elapsed_time = end_time - start_time
+      assert.is.near(elapsed_time, 1, 0.01)
+    end)
+
+
+    it("should sleep for the specified time; fractional", function()
+      local start_time = system.gettime()
+      system.sleep(0.5, 1)
+      local end_time = system.gettime()
+      local elapsed_time = end_time - start_time
+      assert.is.near(0.5, elapsed_time, 0.01)
+    end)
+
+
+    it("should return immediately for a non-positive sleep time", function()
+      local start_time = system.gettime()
+      system.sleep(-1)
+      local end_time = system.gettime()
+      local elapsed_time = end_time - start_time
+      assert.is.near(elapsed_time, 0, 0.01)
+    end)
+
+  end)
+
+end)