fix: make help and version successful discovery

tests/cli.rs

@@ -10,6 +10,31 @@ use std::{
 };
 
 use rustix::process::{Pid, Signal, kill_process};
+
+#[test]
+fn help_and_version_are_successful_discovery_output() {
+    let cases = [
+        (vec!["--help"], "Usage: ghidr"),
+        (vec!["doctor", "--help"], "Usage: ghidr doctor"),
+        (vec!["inspect", "--help"], "Usage: ghidr inspect"),
+        (vec!["functions", "--help"], "Usage: ghidr functions"),
+        (vec!["decompile", "--help"], "Usage: ghidr decompile"),
+        (vec!["clean", "--help"], "Usage: ghidr clean"),
+        (vec!["--version"], "ghidr 0.1.0"),
+    ];
+
+    for (arguments, expected) in cases {
+        let output = Command::new(env!("CARGO_BIN_EXE_ghidr"))
+            .args(arguments)
+            .output()
+            .expect("run discovery request");
+        assert_eq!(output.status.code(), Some(0), "{:?}", output.stderr);
+        assert!(output.stderr.is_empty());
+        let stdout = String::from_utf8(output.stdout).expect("discovery output is UTF-8");
+        assert!(stdout.contains(expected), "{stdout:?}");
+    }
+}
+
 #[test]
 fn doctor_reports_ready_with_closed_runtime_paths() {
     let temp = tempfile::tempdir().expect("temp");