test(alias): cover remove config error JSON code

crates/cli/tests/alias_config_error.rs

@@ -0,0 +1,70 @@
+//! Alias command error output contract tests for config-load failures.
+
+use std::path::{Path, PathBuf};
+use std::process::{Command, Output};
+
+fn rc_binary() -> PathBuf {
+    if let Ok(path) = std::env::var("CARGO_BIN_EXE_rc") {
+        return PathBuf::from(path);
+    }
+
+    let workspace_root = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
+        .parent()
+        .expect("cli crate has parent directory")
+        .parent()
+        .expect("workspace root exists")
+        .to_path_buf();
+
+    let debug_binary = workspace_root.join("target/debug/rc");
+    if debug_binary.exists() {
+        return debug_binary;
+    }
+
+    workspace_root.join("target/release/rc")
+}
+
+fn run_rc_with_config(args: &[&str], config_dir: &Path) -> Output {
+    let mut command = Command::new(rc_binary());
+
+    for (key, _) in std::env::vars_os() {
+        if key.to_string_lossy().starts_with("RC_HOST_") {
+            command.env_remove(key);
+        }
+    }
+
+    command
+        .args(args)
+        .env("RC_CONFIG_DIR", config_dir)
+        .output()
+        .expect("failed to execute rc")
+}
+
+#[test]
+fn alias_remove_json_error_includes_code_for_malformed_config() {
+    let config_dir = tempfile::tempdir().expect("create temp config dir");
+    std::fs::write(config_dir.path().join("config.toml"), "not valid toml")
+        .expect("write malformed config");
+
+    let output = run_rc_with_config(&["alias", "remove", "stale", "--json"], config_dir.path());
+
+    assert_eq!(
+        output.status.code(),
+        Some(1),
+        "stdout: {}\nstderr: {}",
+        String::from_utf8_lossy(&output.stdout),
+        String::from_utf8_lossy(&output.stderr)
+    );
+    assert!(
+        output.stdout.is_empty(),
+        "JSON errors should be emitted on stderr"
+    );
+
+    let stderr = String::from_utf8(output.stderr).expect("stderr should be UTF-8");
+    let json: serde_json::Value = serde_json::from_str(&stderr).expect("stderr is valid JSON");
+    let message = json["error"].as_str().expect("error message");
+    assert!(!message.is_empty(), "payload: {json}");
+    assert_eq!(json["code"], 1);
+    assert_eq!(json["details"]["type"], "general_error");
+    assert_eq!(json["details"]["message"], message);
+    assert_eq!(json["details"]["retryable"], false);
+}