Made geo3d tests independent from each other

django/contrib/gis/tests/geo3d/tests.py

@@ -1,16 +1,17 @@
-from __future__ import absolute_import
+from __future__ import absolute_import, unicode_literals
 
 import os
 import re
 
-from django.utils.unittest import TestCase
 from django.contrib.gis.db.models import Union, Extent3D
 from django.contrib.gis.geos import GEOSGeometry, Point, Polygon
 from django.contrib.gis.utils import LayerMapping, LayerMapError
+from django.test import TestCase
 
 from .models import (City3D, Interstate2D, Interstate3D, InterstateProj2D,
     InterstateProj3D, Point2D, Point3D, MultiPoint3D, Polygon2D, Polygon3D)
 
+
 data_path = os.path.realpath(os.path.join(os.path.dirname(__file__), '..', 'data'))
 city_file = os.path.join(data_path, 'cities', 'cities.shp')
 vrt_file = os.path.join(data_path, 'test_vrt', 'test_vrt.vrt')
@@ -46,12 +47,11 @@ interstate_data = (
 # Bounding box polygon for inner-loop of Houston (in projected coordinate
 # system 32140), with elevation values from the National Elevation Dataset
 # (see above).
-bbox_wkt = 'POLYGON((941527.97 4225693.20,962596.48 4226349.75,963152.57 4209023.95,942051.75 4208366.38,941527.97 4225693.20))'
-bbox_z = (21.71, 13.21, 9.12, 16.40, 21.71)
-def gen_bbox():
-    bbox_2d = GEOSGeometry(bbox_wkt, srid=32140)
-    bbox_3d = Polygon(tuple((x, y, z) for (x, y), z in zip(bbox_2d[0].coords, bbox_z)), srid=32140)
-    return bbox_2d, bbox_3d
+bbox_data = (
+    'POLYGON((941527.97 4225693.20,962596.48 4226349.75,963152.57 4209023.95,942051.75 4208366.38,941527.97 4225693.20))',
+    (21.71, 13.21, 9.12, 16.40, 21.71)
+)
+
 
 class Geo3DTest(TestCase):
     """
@@ -63,20 +63,7 @@ class Geo3DTest(TestCase):
     http://postgis.refractions.net/documentation/manual-1.4/ch08.html#PostGIS_3D_Functions
     """
 
-    def test01_3d(self):
-        "Test the creation of 3D models."
-        # 3D models for the rest of the tests will be populated in here.
-        # For each 3D data set create model (and 2D version if necessary),
-        # retrieve, and assert geometry is in 3D and contains the expected
-        # 3D values.
-        for name, pnt_data in city_data:
-            x, y, z = pnt_data
-            pnt = Point(x, y, z, srid=4326)
-            City3D.objects.create(name=name, point=pnt)
-            city = City3D.objects.get(name=name)
-            self.assertTrue(city.point.hasz)
-            self.assertEqual(z, city.point.z)
-
+    def _load_interstate_data(self):
         # Interstate (2D / 3D and Geographic/Projected variants)
         for name, line, exp_z in interstate_data:
             line_3d = GEOSGeometry(line, srid=4269)
@@ -90,26 +77,51 @@ class Geo3DTest(TestCase):
             Interstate2D.objects.create(name=name, line=line_2d)
             InterstateProj2D.objects.create(name=name, line=line_2d)
 
-            # Retrieving and making sure it's 3D and has expected
-            # Z values -- shouldn't change because of coordinate system.
+    def _load_city_data(self):
+        for name, pnt_data in city_data:
+            City3D.objects.create(name=name, point=Point(*pnt_data, srid=4326))
+
+    def _load_polygon_data(self):
+        bbox_wkt, bbox_z = bbox_data
+        bbox_2d = GEOSGeometry(bbox_wkt, srid=32140)
+        bbox_3d = Polygon(tuple((x, y, z) for (x, y), z in zip(bbox_2d[0].coords, bbox_z)), srid=32140)
+        Polygon2D.objects.create(name='2D BBox', poly=bbox_2d)
+        Polygon3D.objects.create(name='3D BBox', poly=bbox_3d)
+
+    def test_3d_hasz(self):
+        """
+        Make sure data is 3D and has expected Z values -- shouldn't change
+        because of coordinate system.
+        """
+        self._load_interstate_data()
+        for name, line, exp_z in interstate_data:
             interstate = Interstate3D.objects.get(name=name)
             interstate_proj = InterstateProj3D.objects.get(name=name)
             for i in [interstate, interstate_proj]:
                 self.assertTrue(i.line.hasz)
                 self.assertEqual(exp_z, tuple(i.line.z))
 
-        # Creating 3D Polygon.
-        bbox2d, bbox3d = gen_bbox()
-        Polygon2D.objects.create(name='2D BBox', poly=bbox2d)
-        Polygon3D.objects.create(name='3D BBox', poly=bbox3d)
+        self._load_city_data()
+        for name, pnt_data in city_data:
+            city = City3D.objects.get(name=name)
+            z = pnt_data[2]
+            self.assertTrue(city.point.hasz)
+            self.assertEqual(z, city.point.z)
+
+    def test_3d_polygons(self):
+        """
+        Test the creation of polygon 3D models.
+        """
+        self._load_polygon_data()
         p3d = Polygon3D.objects.get(name='3D BBox')
         self.assertTrue(p3d.poly.hasz)
-        self.assertEqual(bbox3d, p3d.poly)
-
-    def test01a_3d_layermapping(self):
-        "Testing LayerMapping on 3D models."
-        from .models import Point2D, Point3D
+        self.assertIsInstance(p3d.poly, Polygon)
+        self.assertEqual(p3d.poly.srid, 32140)
 
+    def test_3d_layermapping(self):
+        """
+        Testing LayerMapping on 3D models.
+        """
         point_mapping = {'point' : 'POINT'}
         mpoint_mapping = {'mpoint' : 'MULTIPOINT'}
 
@@ -134,34 +146,46 @@ class Geo3DTest(TestCase):
         lm.save()
         self.assertEqual(3, MultiPoint3D.objects.count())
 
-    def test02a_kml(self):
-        "Test GeoQuerySet.kml() with Z values."
+    def test_kml(self):
+        """
+        Test GeoQuerySet.kml() with Z values.
+        """
+        self._load_city_data()
         h = City3D.objects.kml(precision=6).get(name='Houston')
         # KML should be 3D.
         # `SELECT ST_AsKML(point, 6) FROM geo3d_city3d WHERE name = 'Houston';`
         ref_kml_regex = re.compile(r'^<Point><coordinates>-95.363\d+,29.763\d+,18</coordinates></Point>$')
         self.assertTrue(ref_kml_regex.match(h.kml))
 
-    def test02b_geojson(self):
-        "Test GeoQuerySet.geojson() with Z values."
+    def test_geojson(self):
+        """
+        Test GeoQuerySet.geojson() with Z values.
+        """
+        self._load_city_data()
         h = City3D.objects.geojson(precision=6).get(name='Houston')
         # GeoJSON should be 3D
         # `SELECT ST_AsGeoJSON(point, 6) FROM geo3d_city3d WHERE name='Houston';`
         ref_json_regex = re.compile(r'^{"type":"Point","coordinates":\[-95.363151,29.763374,18(\.0+)?\]}$')
         self.assertTrue(ref_json_regex.match(h.geojson))
 
-    def test03a_union(self):
-        "Testing the Union aggregate of 3D models."
+    def test_union(self):
+        """
+        Testing the Union aggregate of 3D models.
+        """
         # PostGIS query that returned the reference EWKT for this test:
         #  `SELECT ST_AsText(ST_Union(point)) FROM geo3d_city3d;`
+        self._load_city_data()
         ref_ewkt = 'SRID=4326;MULTIPOINT(-123.305196 48.462611 15,-104.609252 38.255001 1433,-97.521157 34.464642 380,-96.801611 32.782057 147,-95.363151 29.763374 18,-95.23506 38.971823 251,-87.650175 41.850385 181,174.783117 -41.315268 14)'
         ref_union = GEOSGeometry(ref_ewkt)
         union = City3D.objects.aggregate(Union('point'))['point__union']
         self.assertTrue(union.hasz)
         self.assertEqual(ref_union, union)
 
-    def test03b_extent(self):
-        "Testing the Extent3D aggregate for 3D models."
+    def test_extent(self):
+        """
+        Testing the Extent3D aggregate for 3D models.
+        """
+        self._load_city_data()
         # `SELECT ST_Extent3D(point) FROM geo3d_city3d;`
         ref_extent3d = (-123.305196, -41.315268, 14,174.783117, 48.462611, 1433)
         extent1 = City3D.objects.aggregate(Extent3D('point'))['point__extent3d']
@@ -174,8 +198,11 @@ class Geo3DTest(TestCase):
         for e3d in [extent1, extent2]:
             check_extent3d(e3d)
 
-    def test04_perimeter(self):
-        "Testing GeoQuerySet.perimeter() on 3D fields."
+    def test_perimeter(self):
+        """
+        Testing GeoQuerySet.perimeter() on 3D fields.
+        """
+        self._load_polygon_data()
         # Reference query for values below:
         #  `SELECT ST_Perimeter3D(poly), ST_Perimeter2D(poly) FROM geo3d_polygon3d;`
         ref_perim_3d = 76859.2620451
@@ -188,12 +215,15 @@ class Geo3DTest(TestCase):
                                Polygon3D.objects.perimeter().get(name='3D BBox').perimeter.m,
                                tol)
 
-    def test05_length(self):
-        "Testing GeoQuerySet.length() on 3D fields."
+    def test_length(self):
+        """
+        Testing GeoQuerySet.length() on 3D fields.
+        """
         # ST_Length_Spheroid Z-aware, and thus does not need to use
         # a separate function internally.
         # `SELECT ST_Length_Spheroid(line, 'SPHEROID["GRS 1980",6378137,298.257222101]')
         #    FROM geo3d_interstate[2d|3d];`
+        self._load_interstate_data()
         tol = 3
         ref_length_2d = 4368.1721949481
         ref_length_3d = 4368.62547052088
@@ -217,16 +247,22 @@ class Geo3DTest(TestCase):
                                InterstateProj3D.objects.length().get(name='I-45').length.m,
                                tol)
 
-    def test06_scale(self):
-        "Testing GeoQuerySet.scale() on Z values."
+    def test_scale(self):
+        """
+        Testing GeoQuerySet.scale() on Z values.
+        """
+        self._load_city_data()
         # Mapping of City name to reference Z values.
         zscales = (-3, 4, 23)
         for zscale in zscales:
             for city in City3D.objects.scale(1.0, 1.0, zscale):
                 self.assertEqual(city_dict[city.name][2] * zscale, city.scale.z)
 
-    def test07_translate(self):
-        "Testing GeoQuerySet.translate() on Z values."
+    def test_translate(self):
+        """
+        Testing GeoQuerySet.translate() on Z values.
+        """
+        self._load_city_data()
         ztranslations = (5.23, 23, -17)
         for ztrans in ztranslations:
             for city in City3D.objects.translate(0, 0, ztrans):