add tests

Author: Qelxiros

tests/by-util/test_sleep.rs

@@ -5,7 +5,7 @@
 use rstest::rstest;
 
 use uucore::display::Quotable;
-// spell-checker:ignore dont SIGBUS SIGSEGV sigsegv sigbus
+// spell-checker:ignore dont SIGBUS SIGSEGV sigsegv sigbus infd
 use uutests::new_ucmd;
 use uutests::util::TestScenario;
 use uutests::util_name;
@@ -294,6 +294,8 @@ fn test_negative_interval() {
 #[case::frac_suffix("0x0.001h")]
 #[case::scientific("0x1.0p-3")]
 #[case::scientific_suffix("0x1.0p-4s")]
+#[case::inf("infd")]
+#[case::inf("iNfd")]
 fn test_valid_hex_duration(#[case] input: &str) {
     new_ucmd!().args(&["--", input]).succeeds().no_output();
 }
@@ -302,6 +304,9 @@ fn test_valid_hex_duration(#[case] input: &str) {
 #[case::negative("-0x1")]
 #[case::negative_suffix("-0x1s")]
 #[case::negative_frac_suffix("-0x0.1s")]
+#[case::wrong_capitalization("infD")]
+#[case::wrong_capitalization("INFD")]
+#[case::wrong_capitalization("iNfD")]
 fn test_invalid_hex_duration(#[case] input: &str) {
     new_ucmd!()
         .args(&["--", input])