test(system/input_output): fix read

Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>

Author: casaroli

tests/system/input_output.c

@@ -51,18 +51,22 @@ void test_ocre_container_output_stdout(void)
 
 	ocre_container_wait(container, NULL);
 
-	char buf[1000];
+	/* Skip to newline */
+
+	char c;
+	do {
+		size_t n = read(stdout_pair[0], &c, 1);
+		TEST_ASSERT_EQUAL_size_t(1, n);
+	} while (c != '\n');
+
+	char buf[19]; /* "argv[1]=Zirigdum!\n" */
 	memset(buf, 0, sizeof(buf));
 
 	ssize_t n = read(stdout_pair[0], buf, sizeof(buf) - 1);
 
-	TEST_ASSERT_GREATER_THAN_size_t(0, n);
-
-	char *second_line = strchr(buf, '\n');
-	++second_line;
-	TEST_ASSERT_NOT_NULL(second_line);
+	TEST_ASSERT_EQUAL_size_t(sizeof(buf) - 1, n);
 
-	TEST_ASSERT_EQUAL_STRING("argv[1]=" ARG_TEST_STRING "\n", second_line);
+	TEST_ASSERT_EQUAL_STRING("argv[1]=" ARG_TEST_STRING "\n", buf);
 
 	ocre_container_kill(container);
 	ocre_container_wait(container, NULL);