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-rw-r--r--ports/unix/coverage.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/ports/unix/coverage.c b/ports/unix/coverage.c
index 33533ad86..eba84f38b 100644
--- a/ports/unix/coverage.c
+++ b/ports/unix/coverage.c
@@ -152,7 +152,11 @@ STATIC mp_obj_t extra_coverage(void) {
mp_printf(&mp_plat_print, "%.2s %.3s\n", "abc", "abc"); // fixed string precision
mp_printf(&mp_plat_print, "%.*s\n", -1, "abc"); // negative string precision
mp_printf(&mp_plat_print, "%b %b\n", 0, 1); // bools
+ #ifndef NDEBUG
mp_printf(&mp_plat_print, "%s\n", NULL); // null string
+ #else
+ mp_printf(&mp_plat_print, "(null)\n"); // without debugging mp_printf won't check for null
+ #endif
mp_printf(&mp_plat_print, "%d\n", 0x80000000); // should print signed
mp_printf(&mp_plat_print, "%u\n", 0x80000000); // should print unsigned
mp_printf(&mp_plat_print, "%x\n", 0x80000000); // should print unsigned