diff --git a/common/tests.h b/common/tests.h
index fd0c054..56e9949 100644
--- a/common/tests.h
+++ b/common/tests.h
@@ -2,10 +2,48 @@
 #define TESTS_H
 #include <string.h>
 #include <stdio.h>
-#define TEST_SOURCE      "HeLlo world!\0It's a\tBEAUTIFUL\tday!"
+#define TEST_SOURCE "HeLlo world!\0It's a\tBEAUTIFUL\tday!"
 #define TEST_SOURCE_LENGHT 35
-#define TEST_DESTINATION "GooDBye\0and thanks \tfor\rall the fish!"
+#define TEST_DESTINATION "GooDBye\0and thanks _for\rall the fish!"
 #define TEST_DESTINATION_LENGHT 38
+#define TEST_BUF_SIZE 100
+#define TESTS_FUNC_NAME
+#define TESTS_RETURN_PRINTF "%p"
+#define TESTS_PRINT_BUFFERS(TESTS_FUNC_CASE) \
+	printf("original " TESTS_FUNC_CASE "\n"); \
+	dump(s1, TEST_SOURCE_LENGHT); \
+	dump(d1, TEST_DESTINATION_LENGHT); \
+	printf("replicated " TESTS_FUNC_CASE "\n"); \
+	dump(s2, TEST_SOURCE_LENGHT); \
+	dump(d2, TEST_DESTINATION_LENGHT);
+
+#define TESTS_RESET_BUFFERS \
+	memcpy(d1, d, TEST_BUF_SIZE); \
+	memcpy(s1, s, TEST_BUF_SIZE); \
+	memcpy(d2, d, TEST_BUF_SIZE); \
+	memcpy(s2, s, TEST_BUF_SIZE);
+#define TESTS_PRINT_BUFCMP(TESTS_FUNC_CASE) \
+	printf( \
+		"buffers comparison:\n    " TESTS_FUNC_CASE ":\t%i\n ft_" TESTS_FUNC_CASE ":\t%i\n", \
+		bufcmp(s1, s2, TEST_SOURCE_LENGHT), \
+		bufcmp(d1, d2, TEST_DESTINATION_LENGHT) \
+	);
+#define TESTS_PRINT_RETVALS printf("return values: orig: " TESTS_RETURN_PRINTF " ft: %p\n", r1, r2)
+#define TESTS_SYNOPSIS(TESTS_FUNC_CASE) \
+	TESTS_PRINT_BUFFERS(TESTS_FUNC_CASE); \
+	TESTS_PRINT_BUFCMP(TESTS_FUNC_CASE); \
+	TESTS_PRINT_RETVALS; \
+	TESTS_RESET_BUFFERS;
+#define TESTS_SEED(type) \
+	char	s[TEST_BUF_SIZE] = TEST_SOURCE; \
+	char	d[TEST_BUF_SIZE] = TEST_DESTINATION; \
+	type	*r1; \
+	char	s1[TEST_BUF_SIZE] = TEST_SOURCE; \
+	char	d1[TEST_BUF_SIZE] = TEST_DESTINATION; \
+	type	*r2; \
+	char	s2[TEST_BUF_SIZE] = TEST_SOURCE; \
+	char	d2[TEST_BUF_SIZE] = TEST_DESTINATION; 
+
 #define FG_WHT  "\x1B[37m"
 #define FG_MAG  "\x1B[35m"
 #define COLOR_RESET "\x1B[0m"