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diff --git a/src/tests/test_os_zlib.c b/src/tests/test_os_zlib.c
new file mode 100644
index 0000000..736f628
--- /dev/null
+++ b/src/tests/test_os_zlib.c
@@ -0,0 +1,150 @@
+/* Copyright (C) 2014 Trend Micro Inc.
+ * All rights reserved.
+ *
+ * This program is a free software; you can redistribute it
+ * and/or modify it under the terms of the GNU General Public
+ * License (version 2) as published by the FSF - Free Software
+ * Foundation
+ */
+
+#include <check.h>
+#include <stdlib.h>
+#include "../os_zlib/os_zlib.h"
+
+Suite *test_suite(void);
+
+#define TEST_STRING_1 "Hello World!"
+#define TEST_STRING_2 "Test hello \n test \t test \r World\n"
+#define BUFFER_LENGTH 200
+
+START_TEST(test_success1)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, buffer, strlen(TEST_STRING_1), BUFFER_LENGTH);
+
+	ck_assert_uint_ne(i1, 0);
+
+	char buffer2[BUFFER_LENGTH];
+	unsigned long int i2 = os_zlib_uncompress(buffer, buffer2, i1, BUFFER_LENGTH);
+
+	ck_assert_uint_ne(i2, 0);
+	ck_assert_str_eq(buffer2, TEST_STRING_1);
+}
+END_TEST
+
+START_TEST(test_success2)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_2, buffer, strlen(TEST_STRING_2), BUFFER_LENGTH);
+
+	ck_assert_uint_ne(i1, 0);
+
+	char buffer2[BUFFER_LENGTH];
+	unsigned long int i2 = os_zlib_uncompress(buffer, buffer2, i1, BUFFER_LENGTH);
+
+	ck_assert_uint_ne(i2, 0);
+	ck_assert_str_eq(buffer2, TEST_STRING_2);
+}
+END_TEST
+
+START_TEST(test_failcompress1)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(NULL, buffer, strlen(TEST_STRING_1), BUFFER_LENGTH);
+	ck_assert_uint_eq(i1, 0);
+}
+END_TEST
+
+START_TEST(test_failcompress2)
+{
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, NULL, strlen(TEST_STRING_1), BUFFER_LENGTH);
+	ck_assert_uint_eq(i1, 0);
+}
+END_TEST
+
+START_TEST(test_failcompress3)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, buffer, strlen(TEST_STRING_1), 0);
+	ck_assert_uint_eq(i1, 0);
+}
+END_TEST
+
+START_TEST(test_failuncompress1)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, buffer, strlen(TEST_STRING_1), BUFFER_LENGTH);
+	ck_assert_uint_ne(i1, 0);
+
+	char buffer2[BUFFER_LENGTH];
+	unsigned long int i2 = os_zlib_uncompress(NULL, buffer2, i1, BUFFER_LENGTH);
+	ck_assert_uint_eq(i2, 0);
+}
+END_TEST
+
+START_TEST(test_failuncompress2)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, buffer, strlen(TEST_STRING_1), BUFFER_LENGTH);
+	ck_assert_uint_ne(i1, 0);
+
+	unsigned long int i2 = os_zlib_uncompress(buffer, NULL, i1, BUFFER_LENGTH);
+	ck_assert_uint_eq(i2, 0);
+}
+END_TEST
+
+START_TEST(test_failuncompress3)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, buffer, strlen(TEST_STRING_1), BUFFER_LENGTH);
+	ck_assert_uint_ne(i1, 0);
+
+	char buffer2[BUFFER_LENGTH];
+	unsigned long int i2 = os_zlib_uncompress(buffer, buffer2, 0, BUFFER_LENGTH);
+	ck_assert_uint_eq(i2, 0);
+}
+END_TEST
+
+START_TEST(test_failuncompress4)
+{
+	char buffer[BUFFER_LENGTH];
+	unsigned long int i1 = os_zlib_compress(TEST_STRING_1, buffer, strlen(TEST_STRING_1), BUFFER_LENGTH);
+	ck_assert_uint_ne(i1, 0);
+
+	char buffer2[BUFFER_LENGTH];
+	unsigned long int i2 = os_zlib_uncompress(buffer, buffer2, i1, 0);
+	ck_assert_uint_eq(i2, 0);
+}
+END_TEST
+
+
+Suite *test_suite(void)
+{
+	Suite *s = suite_create("os_zlib");
+
+	/* Core test case */
+	TCase *tc_core = tcase_create("Core");
+	tcase_add_test(tc_core, test_success1);
+	tcase_add_test(tc_core, test_success2);
+	tcase_add_test(tc_core, test_failcompress1);
+	tcase_add_test(tc_core, test_failcompress2);
+	tcase_add_test(tc_core, test_failcompress3);
+	tcase_add_test(tc_core, test_failuncompress1);
+	tcase_add_test(tc_core, test_failuncompress2);
+	tcase_add_test(tc_core, test_failuncompress3);
+	tcase_add_test(tc_core, test_failuncompress4);
+	suite_add_tcase(s, tc_core);
+
+	return (s);
+}
+
+int main(void)
+{
+	Suite *s = test_suite();
+	SRunner *sr = srunner_create(s);
+	srunner_run_all(sr, CK_NORMAL);
+	int number_failed = srunner_ntests_failed(sr);
+	srunner_free(sr);
+
+	return ((number_failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE);
+}