tests: fix incorrect argument passing; new test

tests/by-util/test_awk.rs

@@ -1,12 +1,16 @@
-use uutests::new_ucmd;
+use crate::ucmd;
 
 #[test]
 fn empty_program_succeeds() {
-    new_ucmd!().arg("").succeeds();
+    ucmd().arg("").succeeds();
 }
 
 #[test]
-#[ignore = "parser does not yet support print/field expressions"]
 fn print_first_field() {
-    new_ucmd!().arg("{ print $1 }").succeeds();
+    ucmd().args(&["{ print $1 }"]).succeeds();
+}
+
+#[test]
+fn no_args_fails_code_one() {
+    ucmd().fails_with_code(1);
 }