fix that the cli still used the DEFAULT_SOCKET Const, give better error message when no browser found adding test for client and update cli test, and update version and readme

tests/test_cli.py

@@ -47,3 +47,10 @@ def test_install_help_lists_supported_browsers():
 
     assert result.exit_code == 0
     assert "[chrome|chromium|brave|edge|vivaldi]" in result.output
+
+def test_clients_exits_cleanly_when_registry_is_missing():
+    with patch("browser_cli.client.REGISTRY_PATH", Path("/nonexistent/browser-cli-registry.json")):
+        result = CliRunner().invoke(main, ["clients"])
+
+    assert result.exit_code == 1
+    assert "No browser clients found" in result.output

tests/test_client.py

@@ -0,0 +1,40 @@
+import json
+from pathlib import Path
+
+import pytest
+
+from browser_cli.client import BrowserNotConnected, _resolve_socket
+
+def test_resolve_socket_raises_when_registry_missing(monkeypatch):
+    monkeypatch.delenv("BROWSER_CLI_PROFILE", raising=False)
+    monkeypatch.setattr("browser_cli.client.REGISTRY_PATH", Path("/nonexistent/browser-cli-registry.json"))
+
+    with pytest.raises(BrowserNotConnected, match="Cannot resolve a browser socket automatically"):
+        _resolve_socket()
+
+def test_resolve_socket_uses_only_active_registry_entry(monkeypatch, tmp_path):
+    monkeypatch.delenv("BROWSER_CLI_PROFILE", raising=False)
+
+    socket_path = tmp_path / "browser.sock"
+    socket_path.write_text("")
+    registry_path = tmp_path / "registry.json"
+    registry_path.write_text(json.dumps({"abc-uuid": str(socket_path)}))
+
+    monkeypatch.setattr("browser_cli.client.REGISTRY_PATH", registry_path)
+
+    assert _resolve_socket() == str(socket_path)
+
+def test_resolve_socket_raises_when_multiple_active_entries(monkeypatch, tmp_path):
+    monkeypatch.delenv("BROWSER_CLI_PROFILE", raising=False)
+
+    first_socket = tmp_path / "one.sock"
+    second_socket = tmp_path / "two.sock"
+    first_socket.write_text("")
+    second_socket.write_text("")
+    registry_path = tmp_path / "registry.json"
+    registry_path.write_text(json.dumps({"uuid-1": str(first_socket), "uuid-2": str(second_socket)}))
+
+    monkeypatch.setattr("browser_cli.client.REGISTRY_PATH", registry_path)
+
+    with pytest.raises(BrowserNotConnected, match="Multiple browser instances are active: uuid-1, uuid-2"):
+        _resolve_socket()