Merge pull request #238 from crepererum-oss/crepererum/test_help_cmd

test: ensure `help` works both as arg and as cmd

tests/cli.rs

@@ -9,11 +9,17 @@ use assert_cmd::Command;
 use tempfile::TempDir;
 
 #[test]
-fn test_help() {
+fn test_help_arg() {
     let mut cmd = cmd();
     cmd.arg("--help").assert().success();
 }
 
+#[test]
+fn test_help_cmd() {
+    let mut cmd = cmd();
+    cmd.arg("help").assert().success();
+}
+
 fn cmd() -> Command {
     Command::cargo_bin(env!("CARGO_PKG_NAME")).unwrap()
 }