diff --git a/README.md b/README.md
index 1860ed8..3f19a28 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@ __Version:__ 0.5.0
 
 [![CircleCI](https://circleci.com/gh/census-instrumentation/opencensus-erlang.svg?style=svg)](https://circleci.com/gh/census-instrumentation/opencensus-erlang)
 [![codecov](https://codecov.io/gh/census-instrumentation/opencensus-erlang/branch/master/graph/badge.svg)](https://codecov.io/gh/census-instrumentation/opencensus-erlang)
-[![Hex.pm](https://img.shields.io/hexpm/v//opencensus.svg?maxAge=2592000)](https://hex.pm/packages/opencensus)
+[![Hex.pm](https://img.shields.io/hexpm/v/opencensus.svg?maxAge=2592000)](https://hex.pm/packages/opencensus)
 [![Hex.pm](https://img.shields.io/hexpm/dt/opencensus.svg?maxAge=2592000)](https://hex.pm/packages/opencensus)
 
 
diff --git a/rebar.config b/rebar.config
index b88a680..58fbbfd 100644
--- a/rebar.config
+++ b/rebar.config
@@ -8,9 +8,8 @@
         {counters, "~> 0.2.1"}]}.
 
 {project_plugins, [covertool,
-                   rebar3_lint]}.
-
-{plugins, [rebar3_proper]}.
+                   rebar3_lint,
+                   rebar3_proper]}.
 
 {profiles, [
   {test, [{erl_opts, [nowarn_export_all]},
@@ -32,7 +31,7 @@
 
 {cover_enabled, true}.
 {cover_opts, [verbose]}.
-{cover_excl_mods, [oc_trace_pb, oc_trace_config_pb, oc_span_transform, oc_stat_transform]}.
+{cover_excl_mods, [oc_span_transform, oc_stat_transform]}.
 {cover_export_enabled, true}.
 {covertool, [{coverdata_files, ["ct.coverdata"]}]}.
 
diff --git a/test/oc_sampler_period_or_count_prop_SUITE.erl b/test/oc_sampler_period_or_count_prop_SUITE.erl
new file mode 100644
index 0000000..e71e4db
--- /dev/null
+++ b/test/oc_sampler_period_or_count_prop_SUITE.erl
@@ -0,0 +1,41 @@
+%%%------------------------------------------------------------------------
+%% Copyright 2019, OpenCensus Authors
+%% Licensed under the Apache License, Version 2.0 (the "License");
+%% you may not use this file except in compliance with the License.
+%% You may obtain a copy of the License at
+%%
+%% http://www.apache.org/licenses/LICENSE-2.0
+%%
+%% Unless required by applicable law or agreed to in writing, software
+%% distributed under the License is distributed on an "AS IS" BASIS,
+%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+%% See the License for the specific language governing permissions and
+%% limitations under the License.
+%%
+%% @doc
+%% @end
+%%%-----------------------------------------------------------------------
+-module(oc_sampler_period_or_count_prop_SUITE).
+
+-compile(export_all).
+
+-include_lib("common_test/include/ct.hrl").
+
+all() ->
+    [compare_desired_sampling_result_with_factual, validate_sampling_by_checking_counters].
+
+init_per_suite(Config) ->
+    [{property_test_tool, proper} | Config].
+
+end_per_suite(_Config) ->
+    ok.
+
+compare_desired_sampling_result_with_factual(Config) ->
+    ct_property_test:quickcheck(
+      prop_period_or_count:prop_compare_desired_sampling_result_with_factual(),
+      Config).
+
+validate_sampling_by_checking_counters(Config) ->
+    ct_property_test:quickcheck(
+      prop_period_or_count:prop_validate_sampling_by_checking_counters(),
+      Config).
diff --git a/test/property_test/see_pr_2145 b/test/property_test/see_pr_2145
new file mode 100644
index 0000000..e69de29