diff --git a/userspace/libsinsp/test/CMakeLists.txt b/userspace/libsinsp/test/CMakeLists.txt
index 1b96c79d2e..1d5342aa8a 100644
--- a/userspace/libsinsp/test/CMakeLists.txt
+++ b/userspace/libsinsp/test/CMakeLists.txt
@@ -17,13 +17,15 @@
 #
 
 include_directories("${GTEST_INCLUDE_DIR}")
+include_directories("..")
 
 add_executable(unit-test-libsinsp
-	testy_test_face.ut.cpp
+	cgroup_list_counter.ut.cpp
 )
 
 target_link_libraries(unit-test-libsinsp
 	"${GTEST_MAIN_LIB}"
+	sinsp
 )
 
 add_custom_target(run-unit-test-libsinsp
diff --git a/userspace/libsinsp/test/cgroup_list_counter.ut.cpp b/userspace/libsinsp/test/cgroup_list_counter.ut.cpp
new file mode 100644
index 0000000000..bd6322d7c5
--- /dev/null
+++ b/userspace/libsinsp/test/cgroup_list_counter.ut.cpp
@@ -0,0 +1,65 @@
+/*
+Copyright (C) 2019 Sysdig Inc.
+
+This file is part of sysdig.
+
+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.
+
+*/
+
+#include <gtest.h>
+#include <cgroup_list_counter.h>
+
+TEST(cgroup_list_counter_test, basic)
+{
+	libsinsp::cgroup_list_counter counter;
+	ASSERT_EQ(8, counter("0-5,8,14"));
+	ASSERT_EQ(1, counter("5"));
+	ASSERT_EQ(6, counter("9-14"));
+}
+
+TEST(cgroup_list_counter_test, invalid_value)
+{
+	libsinsp::cgroup_list_counter counter;
+	ASSERT_EQ(-1, counter(""));
+	ASSERT_EQ(-1, counter(",1"));
+}
+
+TEST(cgroup_list_counter_test, invalid_range_missing_number)
+{
+	libsinsp::cgroup_list_counter counter;
+	ASSERT_EQ(-1, counter("-5,8,14"));
+	ASSERT_EQ(-1, counter("1,-5,8,14"));
+	ASSERT_EQ(-1, counter("1,4-,14"));
+	ASSERT_EQ(-1, counter("1,4-"));
+}
+
+TEST(cgroup_list_counter_test, invalid_range_double_dash)
+{
+	libsinsp::cgroup_list_counter counter;
+	ASSERT_EQ(-1, counter("1,4-5-6,14"));
+}
+
+TEST(cgroup_list_counter_test, invalid_range_wrong_order)
+{
+	libsinsp::cgroup_list_counter counter;
+	ASSERT_EQ(-1, counter("1,6-5,14"));
+}
+
+TEST(cgroup_list_counter_test, not_a_number)
+{
+	libsinsp::cgroup_list_counter counter;
+	ASSERT_EQ(-1, counter("1,5-a,14"));
+}
+
+
diff --git a/userspace/libsinsp/test/testy_test_face.ut.cpp b/userspace/libsinsp/test/testy_test_face.ut.cpp
deleted file mode 100644
index b8c3912df8..0000000000
--- a/userspace/libsinsp/test/testy_test_face.ut.cpp
+++ /dev/null
@@ -1,28 +0,0 @@
-/*
-Copyright (C) 2019 Sysdig Inc.
-
-This file is part of sysdig.
-
-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.
-
-*/
-
-#include <gtest.h>
-
-/**
- * Ensure that tests are being tested
- */
-TEST(testy_test_face_test, basic)
-{
-	ASSERT_TRUE(true);
-}