[spec] Add more TimeVal tests (#4672)

That should please CodeCov.

spec/unit/timeval_spec.lua

@@ -15,6 +15,13 @@ describe("TimeVal module", function()
         end
     end)
 
+    it("should add", function()
+        local timev1 = TimeVal:new{ sec = 5, usec = 5000}
+        local timev2 = TimeVal:new{ sec = 10, usec = 6000}
+
+        assert.is.same({sec = 15,usec = 11000}, timev1 + timev2)
+    end)
+
     it("should subtract", function()
         local timev1 = TimeVal:new{ sec = 5, usec = 5000}
         local timev2 = TimeVal:new{ sec = 10, usec = 6000}
@@ -31,4 +38,26 @@ describe("TimeVal module", function()
 
         assert.has.errors(function() return timev1 - timev2 end)
     end)
+
+    it("should derive sec and usec from more than 1 sec worth of usec", function()
+        local timev1 = TimeVal:new{ sec = 5, usec = 5000000}
+
+        assert.is.same({sec = 10,usec = 0}, timev1)
+    end)
+
+    it("should compare", function()
+        local timev1 = TimeVal:new{ sec = 5, usec = 5000}
+        local timev2 = TimeVal:new{ sec = 10, usec = 6000}
+        local timev3 = TimeVal:new{ sec = 5, usec = 5000}
+
+        assert.is_true(timev2 > timev1)
+        assert.is_true(timev2 >= timev1)
+
+        assert.is_true(timev1 < timev2)
+        assert.is_true(timev1 <= timev2)
+
+        assert.is_true(timev1 == timev3)
+        assert.is_true(timev1 >= timev3)
+        assert.is_true(timev1 <= timev3)
+    end)
 end)