Add HERON unit tests

tests/unit_tests/test_heron.py

@@ -0,0 +1,61 @@
+import unittest
+from unittest.mock import mock_open, patch, MagicMock
+import xml.etree.ElementTree as ET
+
+from FORCE.src.heron import create_componentsets_in_HERON
+
+class TestCreateComponentSetsInHERON(unittest.TestCase):
+
+    def setUp(self):
+        # Example of a minimal XML structure
+        self.heron_xml = """<HERON>
+                                <Components>
+                                    <Component name="ExistingComponent">
+                                        <economics>
+                                            <CashFlow name="ExistingComponent_capex">
+                                                <fixed_value>100</fixed_value>
+                                            </CashFlow>
+                                        </economics>
+                                    </Component>
+                                </Components>
+                            </HERON>"""
+        self.tree = ET.ElementTree(ET.fromstring(self.heron_xml))
+
+    @patch('xml.etree.ElementTree.parse')
+    @patch('os.listdir')
+    @patch('builtins.open',
+           new_callable=mock_open,
+           read_data="""{
+                            "Component Set Name": "NewComponent",
+                            "Reference Driver": 1000,
+                            "Reference Driver Power Units": "kW",
+                            "Reference Price (USD)": 2000,
+                            "Scaling Factor": 0.5
+                        }""")
+    def test_new_component_creation(self, mock_file, mock_listdir, mock_parse):
+        # Setup the mock to return an XML tree
+        mock_parse.return_value = self.tree
+        mock_listdir.return_value = ['componentSet1.json']
+
+        # Call the function
+        result_tree = create_componentsets_in_HERON("/fake/folder", "/fake/heron_input.xml")
+
+        # Verify the XML was updated correctly
+        components = result_tree.findall('.//Component[@name="NewComponent"]')
+        self.assertEqual(len(components), 1)
+        economics = components[0].find('economics')
+        self.assertIsNotNone(economics)
+
+        # Verify the CashFlow node was created
+        cashflows = economics.findall('CashFlow')
+        self.assertEqual(len(cashflows), 1)
+        self.assertEqual(cashflows[0].attrib['name'], 'NewComponent_capex')
+
+        # Verify the reference driver and price updates
+        ref_driver = cashflows[0].find('./reference_driver/fixed_value')
+        self.assertEqual(ref_driver.text, '1.0')  # The driver should have been converted from kW to MW
+
+    # Add more tests here to cover other conditions and edge cases
+
+if __name__ == '__main__':
+    unittest.main()