NPI-3294 initial tests for functions that determine file properties f…

…rom contents or name. A bit more work could be done here

tests/test_filenames.py

@@ -0,0 +1,80 @@
+import datetime
+from pathlib import Path
+from pyfakefs.fake_filesystem_unittest import TestCase
+
+import gnssanalysis.filenames as filenames
+from test_datasets.sp3_test_data import (
+    # This is a truncated version of file COD0OPSFIN_20242010000_01D_05M_ORB.SP3:
+    sp3_test_data_truncated_cod_final as test_sp3_data
+)
+
+
+class TestPropsFromNameAndContent(TestCase):
+    """
+    Tests for functions deriving file properties from either file content, or filename.
+    TODO: add unit tests to cover other filetypes. Currently only SP3 is tested here.
+    """
+    def setUp(self):
+        self.setUpPyfakefs()
+
+
+    def test_determine_properties_from_contents(self):
+        # Setup
+        # TODO extend to run over multiple filetypes here
+        # file_names = ["/fake/dir/file1.sp3", "/fake/dir/file1.clk", "/fake/dir/file1.orb", "/fake/dir/file1.rnx"]
+        fake_path_string = "/fake/dir/file1.sp3"
+        self.fs.create_file(fake_path_string, contents=test_sp3_data)
+        test_sp3_file = Path(fake_path_string)
+
+        # Run
+        derived_props = filenames.determine_properties_from_contents(test_sp3_file)
+
+        # Verify
+        # These are computed values at time of wrting:
+        known_props = {
+            "analysis_center": "FIL",  # TODO CHECK
+            "content_type": "ORB",  # TODO CHECK
+            "format_type": "SP3",
+            "start_epoch": datetime.datetime(2024, 7, 19, 0, 0),
+            "end_epoch": datetime.datetime(2024, 7, 19, 0, 5),
+            "timespan": datetime.timedelta(seconds=300),
+            "sampling_rate_seconds": 300.0,
+            "sampling_rate": "05M",
+        }
+        self.assertEqual(derived_props, known_props)
+
+
+    def test_determine_properties_from_filename(self):
+        # Run
+        test_filename = "COD0OPSFIN_20242010000_01D_05M_ORB.SP3"
+        derived_props = filenames.determine_properties_from_filename(test_filename)
+
+        # Computed values at time of wrting. By manual inspection these look ok.
+        known_props = {
+            "analysis_center": "COD",
+            "content_type": "ORB",
+            "format_type": "SP3",
+            "start_epoch": datetime.datetime(2024, 7, 19, 0, 0),
+            "timespan": datetime.timedelta(days=1),
+            "solution_type": "FIN",
+            "sampling_rate": "05M",
+            "version": "0",
+            "project": "OPS",
+        }
+        self.assertEqual(derived_props, known_props)
+
+
+    def test_determine_file_name(self):
+        """
+        Test of the filename generation function that leverages determine_properties_from_contents()
+        """
+        # Create fake file, and real path object pointing at it.
+        fake_path_string = "/fake/dir/file1.sp3"
+        self.fs.create_file(fake_path_string, contents=test_sp3_data)
+        test_sp3_file = Path(fake_path_string)
+
+        derived_filename = filenames.determine_file_name(test_sp3_file)
+
+        # Computed at time of wrting. Seems valid, but FIL and EXP are a bit odd.
+        expected_filename = "FIL0EXP_20242010000_05M_05M_ORB.SP3"
+        self.assertEqual(derived_filename, expected_filename)