test: Add a test for System Coupling related settings (#2812)

* test: Add a test for System Coupling related settings

* fix: proper path for system coupling test (#2829)

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Raphael Luciano <[email protected]>

src/ansys/fluent/core/systemcoupling.py

@@ -5,6 +5,7 @@
 from typing import List
 import xml.etree.ElementTree as XmlET
 
+import ansys.fluent.core as pyfluent
 from ansys.fluent.core.utils.fluent_version import FluentVersion
 
 
@@ -89,13 +90,22 @@ def get_scp_string() -> str:
                 file_name=scp_file_name
             )
 
-            # download the file locally in case Fluent is in a container
             if self._solver._fluent_connection._remote_instance != None:
+                # download the file locally in case Fluent is remote
+                # assume file transfer service is configured - download the file
                 self._solver.download(scp_file_name)
+            elif self._solver.connection_properties.inside_container:
+                # Right now, the way that PyFluent containers and tests are set up,
+                # the local Fluent container working directory will correspond to
+                # pyfluent.EXAMPLES_PATH in the host, so that is where the SCP file
+                # will be written.
+                examples_path_scp = os.path.join(pyfluent.EXAMPLES_PATH, scp_file_name)
+                if os.path.exists(examples_path_scp):
+                    scp_file_name = examples_path_scp
 
             assert os.path.exists(
                 scp_file_name
-            ), "ERROR: could not create System Coupling SCP file"
+            ), f"ERROR: could not create System Coupling SCP file: {scp_file_name}"
 
             with open(scp_file_name, "r") as f:
                 xml_string = f.read()

tests/test_systemcoupling.py

@@ -0,0 +1,16 @@
+import pytest
+
+
+@pytest.mark.fluent_version(">=24.1")
+def test_systemcoupling_mixing_elbow_settings(load_mixing_elbow_case_dat):
+    """Very superficial test of System Coupling related settings."""
+    solver = load_mixing_elbow_case_dat
+    # check participant type, analysis type, regions, and variables
+    assert solver.system_coupling.participant_type == "FLUENT"
+    assert solver.system_coupling.get_analysis_type() == "Steady"
+    regions = solver.system_coupling.get_regions()
+    variables = solver.system_coupling.get_variables()
+    # [wall-inlet, wall-elbow, elbow-fluid, hot-inlet, cold-inlet, outlet]
+    assert len(regions) >= 6
+    # [force, dsip, temp, htc, hflow, nwt, hrate, cond, lorentz-force]
+    assert len(variables) >= 9