tests/printf: support %q

tests/by-util/test_printf.rs

@@ -112,6 +112,15 @@ fn sub_b_string_handle_escapes() {
         .stdout_only("hello \tworld");
 }
 
+#[test]
+fn sub_b_string_validate_field_params() {
+    new_ucmd!()
+        .args(&["hello %7b", "world"])
+        .run()
+        .stdout_is("hello ")
+        .stderr_is("printf: %7b: invalid conversion specification\n");
+}
+
 #[test]
 fn sub_b_string_ignore_subs() {
     new_ucmd!()
@@ -120,6 +129,31 @@ fn sub_b_string_ignore_subs() {
         .stdout_only("hello world %% %i");
 }
 
+#[test]
+fn sub_q_string_non_printable() {
+    new_ucmd!()
+        .args(&["non-printable: %q", "\"$test\""])
+        .succeeds()
+        .stdout_only("non-printable: '\"$test\"'");
+}
+
+#[test]
+fn sub_q_string_validate_field_params() {
+    new_ucmd!()
+        .args(&["hello %7q", "world"])
+        .run()
+        .stdout_is("hello ")
+        .stderr_is("printf: %7q: invalid conversion specification\n");
+}
+
+#[test]
+fn sub_q_string_special_non_printable() {
+    new_ucmd!()
+        .args(&["non-printable: %q", "test~"])
+        .succeeds()
+        .stdout_only("non-printable: test~");
+}
+
 #[test]
 fn sub_char() {
     new_ucmd!()