diff --git a/test/inc/mock_i2c.h b/test/inc/mock_i2c.h
new file mode 100644
index 0000000..1c37d99
--- /dev/null
+++ b/test/inc/mock_i2c.h
@@ -0,0 +1,13 @@
+#ifndef __MOCK_I2C_H__
+#define __MOCK_I2C_H__
+
+#include <fff.h>
+
+DEFINE_FFF_GLOBALS;
+
+DECLARE_FAKE_VALUE_FUNC(int, i2c_open, const struct i2c_bb *);
+DECLARE_FAKE_VALUE_FUNC(int, i2c_close, const struct i2c_bb *);
+DECLARE_FAKE_VALUE_FUNC(int, i2c_read, const struct i2c_bb *, uint8_t, char *, unsigned int);
+DECLARE_FAKE_VALUE_FUNC(int, i2c_write, const struct i2c_bb *, uint8_t, const char *, unsigned int);
+
+#endif
diff --git a/test/unit/mock_i2c.c b/test/unit/mock_i2c.c
new file mode 100644
index 0000000..52c6879
--- /dev/null
+++ b/test/unit/mock_i2c.c
@@ -0,0 +1,9 @@
+#include <stdint.h>
+#include <mock_i2c.h>
+
+DEFINE_FFF_GLOBALS;
+
+DEFINE_FAKE_VALUE_FUNC(int, i2c_open, const struct i2c_bb *);
+DEFINE_FAKE_VALUE_FUNC(int, i2c_close, const struct i2c_bb *);
+DEFINE_FAKE_VALUE_FUNC(int, i2c_read, const struct i2c_bb *, uint8_t, char *, unsigned int);
+DEFINE_FAKE_VALUE_FUNC(int, i2c_write, const struct i2c_bb *, uint8_t, const char *, unsigned int);