Fix robot command not found when installed via uv tool

nac_test/robot/pabot.py

@@ -2,6 +2,7 @@
 # Copyright (c) 2025 Daniel Schmidt
 
 import logging
+import sysconfig
 from pathlib import Path
 
 import pabot.pabot
@@ -52,7 +53,22 @@ def run_pabot(
     include = include or []
     exclude = exclude or []
     robot_args: list[str] = []
-    pabot_args = ["--pabotlib", "--pabotlibport", "0"]
+    # Resolve robot binary from the current venv's scripts directory so that pabot
+    # finds the correct robot installation inside the current (possibly isolated)
+    # virtual environment, rather than relying on a bare `robot` on PATH.
+    robot_path = Path(sysconfig.get_path("scripts")) / "robot"
+    if not robot_path.exists():
+        raise RuntimeError(
+            "robot executable not found - ensure robotframework is installed in the same environment as nac-test"
+        )
+    pabot_args = [
+        "--command",
+        str(robot_path),
+        "--end-command",
+        "--pabotlib",
+        "--pabotlibport",
+        "0",
+    ]
 
     if ordering_file and ordering_file.exists():
         pabot_args.extend(["--testlevelsplit", "--ordering", str(ordering_file)])

tests/unit/robot/test_pabot_error_handling.py

@@ -38,6 +38,52 @@ def test_run_pabot_unexpected_exception(self, mock_main_program: MagicMock) -> N
             run_pabot(output_path)
 
 
+# --- Robot executable resolution tests ---
+
+
+class TestRunPabotRobotExecutableResolution:
+    """Test that run_pabot resolves the robot binary via sysconfig."""
+
+    @patch("nac_test.robot.pabot.pabot.pabot.main_program")
+    def test_run_pabot_resolves_robot_using_sysconfig(
+        self, mock_main_program: MagicMock, tmp_path: Path
+    ) -> None:
+        """Test that robot executable is resolved using sysconfig.get_path('scripts')."""
+        fake_scripts_dir = tmp_path / "scripts"
+        fake_scripts_dir.mkdir()
+        fake_robot_executable = fake_scripts_dir / "robot"
+        fake_robot_executable.touch()
+        mock_main_program.return_value = 0
+
+        with patch(
+            "nac_test.robot.pabot.sysconfig.get_path",
+            return_value=str(fake_scripts_dir),
+        ):
+            run_pabot(tmp_path)
+
+        call_args = mock_main_program.call_args[0][0]
+        assert "--command" in call_args
+        command_idx = call_args.index("--command")
+        assert call_args[command_idx + 1] == str(fake_robot_executable)
+
+    @patch("nac_test.robot.pabot.pabot.pabot.main_program")
+    def test_run_pabot_raises_runtime_error_when_robot_not_found(
+        self, mock_main_program: MagicMock, tmp_path: Path
+    ) -> None:
+        """Test that RuntimeError is raised when robot executable does not exist."""
+        fake_scripts_dir = tmp_path / "scripts"
+        fake_scripts_dir.mkdir()
+
+        with patch(
+            "nac_test.robot.pabot.sysconfig.get_path",
+            return_value=str(fake_scripts_dir),
+        ):
+            with pytest.raises(RuntimeError, match="robot executable not found"):
+                run_pabot(tmp_path)
+
+        mock_main_program.assert_not_called()
+
+
 class TestValidateExtraArgsDataError:
     """Test DataError handling in validate_extra_args."""