[unit] Make sure that G_DISABLE_ASSERT is not defined

For whatever reason, g_assert() is a special case and can be disabled
with G_DISABLE_ASSERT macro, unlike all other g_assert_* macros. And
if it's disabled, unit tests won't do what they are supposed to do.

unit/common/test_common.h

@@ -35,6 +35,15 @@
 
 #include <nfc_types.h>
 
+/*
+ * For whatever reason, g_assert() is a special case and can be disabled
+ * with G_DISABLE_ASSERT macro, unlike all other g_assert_* macros. Make
+ * sure that it actually works.
+ */
+#ifdef G_DISABLE_ASSERT
+#  error "g_assert is required by unit tests"
+#endif
+
 #define TEST_FLAG_DEBUG (0x01)
 typedef struct test_opt {
     int flags;