fix: Add error-handling if configuration file is not exists.

- Currently, 'info' command only
- Change pipe for Error type

src/commands/info.rs

@@ -3,13 +3,16 @@
 use crate::config;
 use crate::versioning;
 
-use anyhow::Result;
+use anyhow::{anyhow, Result};
 use clap::Args;
 
 #[derive(Args)]
 pub(crate) struct Arguments {}
 
 pub(crate) fn execute(_args: &Arguments) -> Result<()> {
+    if config::find_config_path().is_none() {
+        return Err(anyhow!("Configuratio file is not exists."));
+    }
     // Load config file.
     let config_data = config::load_config().unwrap();
     println!("# Version info");

src/main.rs

@@ -7,11 +7,12 @@ use crate::commands::run_command;
 
 fn main() {
     let result = run_command();
-    match result {
+    let return_code = match result {
         Ok(()) => 0,
         Err(err) => {
-            println!("{err}");
+            eprintln!("{err}");
             1
         }
     };
+    std::process::exit(return_code);
 }

tests/test_info.py

@@ -0,0 +1,14 @@
+"""Test case for ``age info``."""
+
+from pathlib import Path
+from subprocess import PIPE, run
+
+
+def test_not_configured_env(target_bin: str, tmp_path: Path):
+    """'info' command requires configuration file.
+
+    If age does not find configuration file, it should display message.
+    """
+    proc = run([target_bin, "info"], stdout=PIPE, stderr=PIPE, text=True, cwd=tmp_path)
+    assert proc.returncode == 1
+    assert "not exists." in proc.stderr