#!/usr/bin/env python3
"""
Test suite for S-57 Parser
Tests must be written before implementation
"""
import unittest
import json
import os
import sys
from pathlib import Path
from unittest.mock import Mock, patch, MagicMock
# Add parent directory to path to import s57_parser
sys.path.insert(0, str(Path(__file__).parent))
# This will fail initially until s57_parser is implemented
try:
from s57_parser import S57Parser, S57Feature, S57ParseError
except ImportError:
# Define placeholder classes for tests to be written
class S57Parser:
pass
class S57Feature:
pass
class S57ParseError(Exception):
pass
class TestS57Parser(unittest.TestCase):
"""Test cases for S-57 parser functionality"""
def setUp(self):
"""Set up test fixtures"""
self.parser = S57Parser()
self.test_s57_file = "test_chart.000"
self.mock_gdal = MagicMock()
def tearDown(self):
"""Clean up after tests"""
pass
# File Opening Tests
def test_open_valid_s57_file(self):
"""Test that parser can open a valid S-57 file"""
with patch('osgeo.gdal.OpenEx') as mock_open:
mock_dataset = MagicMock()
mock_open.return_value = mock_dataset
result = self.parser.open(self.test_s57_file)
self.assertIsNotNone(result)
mock_open.assert_called_once()
self.assertEqual(result, mock_dataset)
def test_open_nonexistent_file(self):
"""Test handling of non-existent file"""
with patch('osgeo.gdal.OpenEx') as mock_open:
mock_open.return_value = None
with self.assertRaises(S57ParseError) as context:
self.parser.open("nonexistent.000")
self.assertIn("Could not open", str(context.exception))
def test_open_invalid_format(self):
"""Test handling of invalid file format"""
with patch('osgeo.gdal.OpenEx') as mock_open:
mock_open.side_effect = Exception("Invalid format")
with self.assertRaises(S57ParseError) as context:
self.parser.open("invalid.txt")
self.assertIn("Invalid", str(context.exception))
# Layer Extraction Tests
def test_extract_layers(self):
"""Test extraction of layers from S-57 file"""
mock_dataset = MagicMock()
mock_layer1 = MagicMock()
mock_layer1.GetName.return_value = "DEPARE"
mock_layer2 = MagicMock()
mock_layer2.GetName.return_value = "LIGHTS"
mock_dataset.GetLayerCount.return_value = 2
mock_dataset.GetLayer.side_effect = [mock_layer1, mock_layer2]
layers = self.parser.extract_layers(mock_dataset)
self.assertEqual(len(layers), 2)
self.assertEqual(layers[0]['name'], "DEPARE")
self.assertEqual(layers[1]['name'], "LIGHTS")
def test_extract_layers_empty_dataset(self):
"""Test extraction from dataset with no layers"""
mock_dataset = MagicMock()
mock_dataset.GetLayerCount.return_value = 0
layers = self.parser.extract_layers(mock_dataset)
self.assertEqual(len(layers), 0)
# Feature Extraction Tests
def test_extract_features_from_layer(self):
"""Test extraction of features from a layer"""
mock_layer = MagicMock()
mock_layer.GetName.return_value = "DEPARE"
mock_layer.GetFeatureCount.return_value = 2
# Mock features
mock_feature1 = MagicMock()
mock_feature1.GetFID.return_value = 1
mock_feature1.GetFieldCount.return_value = 2
mock_feature1.GetFieldDefnRef.side_effect = lambda i: MagicMock(GetName=lambda: f"field{i}")
mock_feature1.GetField.side_effect = lambda i: f"value{i}"
mock_feature2 = MagicMock()
mock_feature2.GetFID.return_value = 2
mock_feature2.GetFieldCount.return_value = 2
mock_feature2.GetFieldDefnRef.side_effect = lambda i: MagicMock(GetName=lambda: f"field{i}")
mock_feature2.GetField.side_effect = lambda i: f"value{i}"
mock_layer.GetNextFeature.side_effect = [mock_feature1, mock_feature2, None]
features = self.parser.extract_features(mock_layer)
self.assertEqual(len(features), 2)
self.assertEqual(features[0]['id'], 1)
self.assertEqual(features[1]['id'], 2)
# Geometry Conversion Tests
def test_convert_point_geometry(self):
"""Test conversion of point geometry to GeoJSON"""
mock_geometry = MagicMock()
mock_geometry.GetGeometryType.return_value = 1 # wkbPoint
mock_geometry.GetX.return_value = -122.123
mock_geometry.GetY.return_value = 47.456
mock_geometry.GetZ.return_value = 10.5
geojson = self.parser.convert_geometry_to_geojson(mock_geometry)
self.assertEqual(geojson['type'], 'Point')
self.assertEqual(geojson['coordinates'], [-122.123, 47.456, 10.5])
def test_convert_linestring_geometry(self):
"""Test conversion of linestring geometry to GeoJSON"""
mock_geometry = MagicMock()
mock_geometry.GetGeometryType.return_value = 2 # wkbLineString
mock_geometry.GetPointCount.return_value = 3
mock_geometry.GetPoint.side_effect = [
(-122.1, 47.1, 0),
(-122.2, 47.2, 0),
(-122.3, 47.3, 0)
]
geojson = self.parser.convert_geometry_to_geojson(mock_geometry)
self.assertEqual(geojson['type'], 'LineString')
self.assertEqual(len(geojson['coordinates']), 3)
self.assertEqual(geojson['coordinates'][0], [-122.1, 47.1, 0])
def test_convert_polygon_geometry(self):
"""Test conversion of polygon geometry to GeoJSON"""
mock_geometry = MagicMock()
mock_geometry.GetGeometryType.return_value = 3 # wkbPolygon
# Mock ring
mock_ring = MagicMock()
mock_ring.GetPointCount.return_value = 4
mock_ring.GetPoint.side_effect = [
(-122.1, 47.1, 0),
(-122.2, 47.1, 0),
(-122.2, 47.2, 0),
(-122.1, 47.1, 0) # Closed ring
]
mock_geometry.GetGeometryCount.return_value = 1
mock_geometry.GetGeometryRef.return_value = mock_ring
geojson = self.parser.convert_geometry_to_geojson(mock_geometry)
self.assertEqual(geojson['type'], 'Polygon')
self.assertEqual(len(geojson['coordinates']), 1)
self.assertEqual(len(geojson['coordinates'][0]), 4)
# Coordinate Transformation Tests
def test_transform_coordinates_to_wgs84(self):
"""Test coordinate transformation to WGS84"""
mock_geometry = MagicMock()
mock_srs = MagicMock()
mock_srs.GetAuthorityCode.return_value = "4326" # Already WGS84
mock_geometry.GetSpatialReference.return_value = mock_srs
# Should not transform if already WGS84
result = self.parser.transform_to_wgs84(mock_geometry)
self.assertEqual(result, mock_geometry)
mock_geometry.Transform.assert_not_called()
def test_transform_coordinates_from_other_srs(self):
"""Test coordinate transformation from other SRS"""
mock_geometry = MagicMock()
mock_srs = MagicMock()
mock_srs.GetAuthorityCode.return_value = "32633" # UTM Zone 33N
mock_geometry.GetSpatialReference.return_value = mock_srs
with patch('osgeo.osr.SpatialReference') as mock_srs_class:
mock_wgs84 = MagicMock()
mock_srs_class.return_value = mock_wgs84
with patch('osgeo.osr.CoordinateTransformation') as mock_transform_class:
mock_transform = MagicMock()
mock_transform_class.return_value = mock_transform
result = self.parser.transform_to_wgs84(mock_geometry)
mock_geometry.Transform.assert_called_once_with(mock_transform)
# Output Format Tests
def test_parse_to_geojson_format(self):
"""Test complete parsing to GeoJSON format"""
expected_output = {
"type": "FeatureCollection",
"features": [
{
"type": "Feature",
"id": "DEPARE.1",
"geometry": {
"type": "Polygon",
"coordinates": [[[-122.1, 47.1], [-122.2, 47.1], [-122.2, 47.2], [-122.1, 47.1]]]
},
"properties": {
"DRVAL1": 0,
"DRVAL2": 10,
"_featureType": "DEPARE"
}
}
]
}
with patch.object(self.parser, 'open') as mock_open:
with patch.object(self.parser, 'extract_layers') as mock_layers:
with patch.object(self.parser, 'extract_features') as mock_features:
mock_open.return_value = MagicMock()
mock_layers.return_value = [{'name': 'DEPARE', 'layer': MagicMock()}]
mock_features.return_value = [{
'id': 1,
'geometry': {
'type': 'Polygon',
'coordinates': [[[-122.1, 47.1], [-122.2, 47.1], [-122.2, 47.2], [-122.1, 47.1]]]
},
'properties': {
'DRVAL1': 0,
'DRVAL2': 10
}
}]
result = self.parser.parse(self.test_s57_file)
self.assertEqual(result['type'], 'FeatureCollection')
self.assertEqual(len(result['features']), 1)
self.assertEqual(result['features'][0]['properties']['_featureType'], 'DEPARE')
# Error Handling Tests
def test_handle_corrupt_geometry(self):
"""Test handling of corrupt geometry"""
mock_geometry = MagicMock()
mock_geometry.GetGeometryType.side_effect = Exception("Corrupt geometry")
result = self.parser.convert_geometry_to_geojson(mock_geometry)
self.assertIsNone(result)
def test_handle_missing_properties(self):
"""Test handling of features with missing properties"""
mock_feature = MagicMock()
mock_feature.GetFieldCount.return_value = 0
mock_feature.GetFID.return_value = 1
result = self.parser.extract_feature_properties(mock_feature)
self.assertEqual(result, {})
# Performance Tests
def test_parse_with_filters(self):
"""Test parsing with feature type filters"""
options = {
'feature_types': ['DEPARE', 'LIGHTS'],
'bbox': [-122.5, 47.0, -122.0, 47.5]
}
with patch.object(self.parser, 'open') as mock_open:
mock_dataset = MagicMock()
mock_open.return_value = mock_dataset
result = self.parser.parse(self.test_s57_file, options)
# Should only process specified feature types
self.assertIsNotNone(result)
# Integration Tests
def test_full_parse_workflow(self):
"""Test complete parsing workflow from file to GeoJSON"""
# This test verifies the full workflow
with patch('osgeo.gdal.OpenEx') as mock_open:
# Setup complex mock structure
mock_dataset = MagicMock()
mock_layer = MagicMock()
mock_feature = MagicMock()
mock_geometry = MagicMock()
# Configure mocks
mock_open.return_value = mock_dataset
mock_dataset.GetLayerCount.return_value = 1
mock_dataset.GetLayer.return_value = mock_layer
mock_layer.GetName.return_value = "DEPARE"
mock_layer.ResetReading.return_value = None
mock_layer.GetNextFeature.side_effect = [mock_feature, None]
mock_feature.GetFID.return_value = 1
mock_feature.GetGeometry.return_value = mock_geometry
mock_feature.GetFieldCount.return_value = 2
mock_feature.GetFieldDefnRef.side_effect = lambda i: MagicMock(
GetName=lambda: ['DRVAL1', 'DRVAL2'][i]
)
mock_feature.GetField.side_effect = [0, 10]
mock_geometry.GetGeometryType.return_value = 1 # Point
mock_geometry.GetX.return_value = -122.123
mock_geometry.GetY.return_value = 47.456
mock_geometry.GetSpatialReference.return_value = None
# Execute parse
result = self.parser.parse(self.test_s57_file)
# Verify results
self.assertEqual(result['type'], 'FeatureCollection')
self.assertEqual(len(result['features']), 1)
feature = result['features'][0]
self.assertEqual(feature['type'], 'Feature')
self.assertEqual(feature['geometry']['type'], 'Point')
self.assertEqual(feature['properties']['DRVAL1'], 0)
self.assertEqual(feature['properties']['DRVAL2'], 10)
class TestS57ParserCommandLine(unittest.TestCase):
"""Test command-line interface"""
def test_parse_command_line_args(self):
"""Test parsing of command-line arguments"""
test_args = ['s57_parser.py', 'chart.000', '-o', 'output.json']
with patch('sys.argv', test_args):
from s57_parser import parse_args
args = parse_args()
self.assertEqual(args.input, 'chart.000')
self.assertEqual(args.output, 'output.json')
def test_main_execution(self):
"""Test main function execution"""
test_args = ['s57_parser.py', 'test.000']
with patch('sys.argv', test_args):
with patch('s57_parser.S57Parser') as mock_parser_class:
mock_parser = MagicMock()
mock_parser_class.return_value = mock_parser
mock_parser.parse.return_value = {'type': 'FeatureCollection', 'features': []}
from s57_parser import main
with patch('builtins.print') as mock_print:
result = main()
self.assertEqual(result, 0)
mock_parser.parse.assert_called_once_with('test.000', {})
mock_print.assert_called()
if __name__ == '__main__':
unittest.main()
