fix: single load in remove, use dataclasses.replace in config_cmd, add remove-running test

src/autossh_mgr/cli.py

@@ -1,4 +1,5 @@
 import click
+from dataclasses import replace
 from autossh_mgr.config import (
     TunnelConfig, get_config_dir, ensure_dirs,
     load_tunnels, save_tunnels, get_tunnel,
@@ -98,14 +99,15 @@ def add(
 def remove(ctx, name):
     """Remove a tunnel configuration."""
     config_dir = ctx.obj["config_dir"]
-    get_tunnel(config_dir, name)  # raises if not found
+    tunnels = load_tunnels(config_dir)
+    if not any(t.name == name for t in tunnels):
+        raise click.ClickException(f"No tunnel named '{name}'")
     status = get_status(config_dir, name)
     if status.state == "running":
         raise click.ClickException(f"Stop '{name}' before removing it")
     if not click.confirm(f"Remove tunnel '{name}'?"):
         return
-    tunnels = [t for t in load_tunnels(config_dir) if t.name != name]
-    save_tunnels(config_dir, tunnels)
+    save_tunnels(config_dir, [t for t in tunnels if t.name != name])
     click.echo(f"Removed tunnel '{name}'")
 
 
@@ -149,13 +151,8 @@ def config_cmd(ctx, name, key, value):
             f"Invalid value for '{key}': expected {_FIELD_TYPES[key].__name__}"
         )
     tunnels = load_tunnels(config_dir)
-    found = False
-    for t in tunnels:
-        if t.name == name:
-            setattr(t, key, typed_value)
-            found = True
-            break
-    if not found:
+    if not any(t.name == name for t in tunnels):
         raise click.ClickException(f"No tunnel named '{name}'")
+    tunnels = [replace(t, **{key: typed_value}) if t.name == name else t for t in tunnels]
     save_tunnels(config_dir, tunnels)
     click.echo(f"Updated {name}.{key} = {typed_value}")