test: add hex flag test for lscpu

Author: Harshit933

src/uu/lscpu/src/lscpu.rs

@@ -16,7 +16,7 @@ const USAGE: &str = help_usage!("lscpu.md");
 pub fn uumain(args: impl uucore::Args) -> UResult<()> {
     let _matches: clap::ArgMatches = uu_app().try_get_matches_from(args)?;
     let system = System::new_all();
-    let hex= _matches.get_flag(options::HEX);
+    let hex = _matches.get_flag(options::HEX);
 
     println!("Architecture: {}", get_architecture());
     if hex {

tests/by-util/test_lscpu.rs

@@ -9,3 +9,8 @@ use crate::common::util::TestScenario;
 fn test_invalid_arg() {
     new_ucmd!().arg("--definitely-invalid").fails().code_is(1);
 }
+
+#[test]
+fn test_lscpt_with_arg() {
+    new_ucmd!().arg("--hex").succeeds().stdout_contains("0x");
+}