Add unit tests

test/lager_test_backend.erl

@@ -210,7 +210,7 @@ lager_test_() ->
             },
             {"unsafe logging with args works",
                 fun() ->
-                        lager:warning("test message ~p", [self()]),
+                        lager:warning_unsafe("test message ~p", [self()]),
                         ?assertEqual(1, count()),
                         {Level, _Time, Message,_Metadata}  = pop(),
                         ?assertMatch(Level, lager_util:level_to_num(warning)),
@@ -479,6 +479,26 @@ lager_test_() ->
                         lager:clear_all_traces(),
                         lager:info([{requestid, 6}], "hello world"),
                         ?assertEqual(10, count()),
+                        lager:clear_all_traces(),
+                        lager:trace(?MODULE, [{requestid, '>=', 5}, {requestid, '=<', 7}], debug),
+                        lager:info([{requestid, 4}], "nope!"),
+                        lager:info([{requestid, 5}], "hello world"),
+                        lager:info([{requestid, 7}], "hello world again"),
+                        ?assertEqual(12, count()),
+                        lager:clear_all_traces(),
+                        lager:trace(?MODULE, [{foo, '!=', bar}]),
+                        lager:info([{foo, bar}], "hello world"),
+                        ?assertEqual(12, count()),
+                        lager:info([{foo, baz}], "blarg"),
+                        ?assertEqual(13, count()),
+                        lager:clear_all_traces(),
+                        lager:trace(?MODULE, [{all, [{foo, '=', bar}, {null, false}]}]),
+                        lager:info([{foo, bar}], "should not be logged"),
+                        ?assertEqual(13, count()),
+                        lager:clear_all_traces(),
+                        lager:trace(?MODULE, [{any, [{foo, '=', bar}, {null, true}]}]),
+                        lager:info([{foo, qux}], "should be logged"),
+                        ?assertEqual(14, count()),
                         ok
                 end
             },