Add example for the weak linking

examples/weak_linking/test/sensor.test.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include "test_common.h"
+#include "sensor.h"
+#include "sensor.fake.h"
+
+DEFINE_FFF_GLOBALS;
+
+
+int main(void)
+{
+   init_tests(); 
+   
+   assert( sensor_init() == true );
+   
+
+   TEST_sensor_generate_data( GLOBAL_TEST_bus_read_ret, 1.5f );
+   float value = sensor_read();
+   float value_error = value - 1.5f;
+   assert( value_error < 0.1f && value_error > -0.1f );
+   printf("Test " __FILE__ " ok\n");
+   return 0;
+}