Add ut_assertnull macro to include/test/ut.h
For testing of functions that returns NULL on errors.

Signed-off-by: Ramon Fried <ramon.fr...@gmail.com>
---
 include/test/ut.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/test/ut.h b/include/test/ut.h
index 59b23a25a4..fce75fd12a 100644
--- a/include/test/ut.h
+++ b/include/test/ut.h
@@ -90,6 +90,18 @@ void ut_failf(struct unit_test_state *uts, const char 
*fname, int line,
        }                                                               \
 }
 
+/* Assert that a pointer is NULL */
+#define ut_assertnull(expr) {                                  \
+       const void *val = (expr);                                       \
+                                                                       \
+       if (val != NULL) {                                              \
+               ut_failf(uts, __FILE__, __LINE__, __func__,             \
+                        #expr " != NULL",                              \
+                        "Expected NULL, got %p", val);         \
+               return CMD_RET_FAILURE;                                 \
+       }                                                               \
+}
+
 /* Assert that a pointer is not NULL */
 #define ut_assertnonnull(expr) {                                       \
        const void *val = (expr);                                       \
-- 
2.17.1

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