diff --git a/PythonModels/systems/test_mql_computed.py b/PythonModels/systems/test_mql_computed.py
index bc6dc1f..e13bfb9 100644
--- a/PythonModels/systems/test_mql_computed.py
+++ b/PythonModels/systems/test_mql_computed.py
@@ -67,6 +67,23 @@ class TestMqlComputedGeometryRun:
         return len(self.output.data_paths)
 
 
+@dataclass(frozen=True)
+class TestMqlComputedLineRelationsRun:
+    amesim_results: AmesimResults
+    observation_catalog: TestMqlObservationCatalog
+    output_schema: TestMqlOutputSchema
+    output: TestMqlValidatedOutput
+    comparison: TestMqlComparisonResult
+
+    @property
+    def sample_count(self) -> int:
+        return len(self.output.times)
+
+    @property
+    def signal_count(self) -> int:
+        return len(self.output.data_paths)
+
+
 @dataclass(frozen=True)
 class TestMqlComputedPneumaticRelationsRun:
     amesim_results: AmesimResults
@@ -189,6 +206,39 @@ def run_test_mql_computed_geometry(
     )
 
 
+def run_test_mql_computed_line_relations(
+    archive_path: Path,
+) -> TestMqlComputedLineRelationsRun:
+    amesim_results = load_test_mql_amesim_results(archive_path)
+    observation_catalog = build_test_mql_observation_catalog(amesim_results)
+    output_schema = build_test_mql_output_schema(
+        amesim_results,
+        observation_catalog=observation_catalog,
+    )
+    output_series = _compute_line_reversed_series(amesim_results, observation_catalog)
+    output_data_paths = tuple(output_series)
+    output = validate_test_mql_output(
+        times=amesim_results.times,
+        series_by_data_path=output_series,
+        schema=output_schema,
+        data_paths=output_data_paths,
+    )
+    comparison = compare_validated_test_mql_output(
+        times=output.times,
+        series_by_data_path=output.series_by_data_path,
+        schema=output_schema,
+        amesim_results=amesim_results,
+        data_paths=output.data_paths,
+    )
+    return TestMqlComputedLineRelationsRun(
+        amesim_results=amesim_results,
+        observation_catalog=observation_catalog,
+        output_schema=output_schema,
+        output=output,
+        comparison=comparison,
+    )
+
+
 def run_test_mql_computed_pneumatic_relations(
     archive_path: Path,
 ) -> TestMqlComputedPneumaticRelationsRun:
@@ -397,3 +447,22 @@ def _compute_orifice_reversed_series(
         )
     return series_by_data_path
 
+
+def _compute_line_reversed_series(
+    amesim_results: AmesimResults,
+    observation_catalog: TestMqlObservationCatalog,
+) -> dict[str, tuple[float, ...]]:
+    series_by_data_path: dict[str, tuple[float, ...]] = {}
+    for binding in observation_catalog.lines.by_submodel("PNL00R"):
+        if len(binding.mass_flow_paths) != 2 or len(binding.enthalpy_flow_paths) != 2:
+            raise ValueError(f"Expected two PNL00R flow paths for {binding.alias}.")
+        primary_mass_path, reversed_mass_path = binding.mass_flow_paths
+        primary_enthalpy_path, reversed_enthalpy_path = binding.enthalpy_flow_paths
+        series_by_data_path[reversed_mass_path] = tuple(
+            -value for value in amesim_results.series(primary_mass_path)
+        )
+        series_by_data_path[reversed_enthalpy_path] = tuple(
+            -value for value in amesim_results.series(primary_enthalpy_path)
+        )
+    return series_by_data_path
+
diff --git a/tests/test_test_mql_computed.py b/tests/test_test_mql_computed.py
index e51f511..96b5c18 100644
--- a/tests/test_test_mql_computed.py
+++ b/tests/test_test_mql_computed.py
@@ -5,6 +5,7 @@ from pathlib import Path
 
 from PythonModels.systems.test_mql_computed import (
     run_test_mql_computed_geometry,
+    run_test_mql_computed_line_relations,
     run_test_mql_computed_mechanical_relations,
     run_test_mql_computed_piston_geometry,
     run_test_mql_computed_pneumatic_relations,
@@ -111,6 +112,43 @@ class TestMqlComputedGeometryTests(unittest.TestCase):
         )
 
 
+class TestMqlComputedLineRelationsTests(unittest.TestCase):
+    @classmethod
+    def setUpClass(cls) -> None:
+        cls.computed_run = run_test_mql_computed_line_relations(TEST_MQL_AME)
+
+    def test_computed_line_relations_outputs_schema_valid_series(self) -> None:
+        self.assertEqual(self.computed_run.sample_count, 1002)
+        self.assertEqual(len(self.computed_run.observation_catalog.lines.by_submodel("PNL00R")), 4)
+        self.assertEqual(self.computed_run.signal_count, 8)
+        self.assertEqual(len(self.computed_run.comparison.metrics), 8)
+        self.assertEqual(self.computed_run.output_schema.signal_count, 858)
+
+    def test_computed_line_relations_include_expected_paths(self) -> None:
+        paths = self.computed_run.output.data_paths
+
+        self.assertIn("dm2@pneumatic_100", paths)
+        self.assertIn("dh2@pneumatic_100", paths)
+        self.assertEqual(len([path for path in paths if path.startswith("dm2@")]), 4)
+        self.assertEqual(len([path for path in paths if path.startswith("dh2@")]), 4)
+
+    def test_computed_line_relations_match_amesim_exactly(self) -> None:
+        for data_path in self.computed_run.output.data_paths:
+            metric = self.computed_run.comparison.metric(data_path)
+            with self.subTest(data_path=data_path):
+                self.assertEqual(metric.max_abs_error, 0.0)
+
+    def test_computed_line_relations_final_samples_match_expected_values(self) -> None:
+        self.assertAlmostEqual(
+            self.computed_run.output.series("dm2@pneumatic_100")[-1],
+            1.4837698580885316e-30,
+        )
+        self.assertAlmostEqual(
+            self.computed_run.output.series("dh2@pneumatic_100")[-1],
+            -1.2638893078048237e-28,
+        )
+
+
 class TestMqlComputedPneumaticRelationsTests(unittest.TestCase):
     @classmethod
     def setUpClass(cls) -> None: