1 files changed, 4 insertions, 0 deletions
diff --git a/common.h b/common.h
index bd273be..e55ca46 100644
--- a/common.h
+++ b/common.h
@@ -151,6 +151,10 @@ run_tests(const char *name, enum libhashsum_algorithm algorithm, size_t hash_siz
 			fprintf(stderr, "libhashsum_init_hasher returned NULL pointer in .finalise\n");
 			return 2;
 		}
+		if (hasher.stretch) {
+			fprintf(stderr, "libhashsum_init_hasher returned non-NULL pointer in .stretch\n");
+			return 2;
+		}
 		input_string_len = strlen(testcases[i].input);
 		bits = testcases[i].extra_bits;
 		if (bits) {