Add another test for mroe coverage

test/test_read_file.c

@@ -102,6 +102,28 @@ START_TEST (test_read_file_devnull)
     
 END_TEST
 
+START_TEST (test_read_file_too_big)
+    char *content;
+    const char *filename = "test_read_file_simple";
+    size_t len;
+    ssize_t rc;
+
+    int fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0664);
+    fail_if(fd == -1);
+
+    rc = write(fd, "hello", 5);
+    fail_if(rc != 5, "rc was %ld", (long)rc);
+
+    close(fd);
+
+    content = uc_read_file(filename, &len, 4);
+
+    fail_if(errno != EMSGSIZE);
+    fail_if(content != NULL);
+
+    unlink(filename);
+END_TEST
+
 Suite *read_file_suite(void)
 {
     Suite *s = suite_create("read_file");
@@ -111,6 +133,7 @@ Suite *read_file_suite(void)
     tcase_add_test(tc, test_read_file_greater_than_max);
     tcase_add_test(tc, test_read_file_boundary);
     tcase_add_test(tc, test_read_file_devnull);
+    tcase_add_test(tc, test_read_file_too_big);
 
 
     suite_add_tcase(s, tc);