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trunk/thuban/test/test_proj.py revision 333 by bh, Fri Sep 20 15:47:07 2002 UTC branches/WIP-pyshapelib-bramz/test/test_proj.py revision 2734 by bramz, Thu Mar 1 12:42:59 2007 UTC
# Line 1  Line 1 
1  # Copyright (c) 2002 by Intevation GmbH  # Copyright (c) 2002, 2003, 2006 by Intevation GmbH
2  # Authors:  # Authors:
3  # Bernhard Herzog <[email protected]>  # Bernhard Herzog <[email protected]>
4    # Bernhard Reiter <[email protected]>
5  #  #
6  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
7  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 14  __version__ = "$Revision$" Line 15  __version__ = "$Revision$"
15  # $Id$  # $Id$
16    
17  import unittest  import unittest
18    import locale
19    import os
20    
21    import localessupport
22    import xmlsupport
23  import support  import support
24  support.initthuban()  support.initthuban()
25    
26  from Thuban.Model.proj import Projection  from Thuban import _
27    from Thuban.Model.proj import Projection, ProjFile, \
28         PROJ_UNITS_METERS, PROJ_UNITS_DEGREES
29    from Thuban.Model.messages import PROJECTION_ADDED, PROJECTION_REMOVED, \
30         PROJECTION_REPLACED
31    import Thuban.Model.resource as resource
32    
33    from xmlsupport import sax_eventlist
34    
35    from xml.sax import SAXParseException
36    
37    
38  class TestProjection(unittest.TestCase, support.FloatComparisonMixin):  class TestProjection(unittest.TestCase, support.FloatComparisonMixin):
# Line 28  class TestProjection(unittest.TestCase, Line 42  class TestProjection(unittest.TestCase,
42    
43      def test(self):      def test(self):
44          """Test Projection"""          """Test Projection"""
45          proj = Projection(["zone=26", "proj=utm", "ellps=clrk66"])          params = ["zone=26", "proj=utm", "ellps=clrk66"]
46          self.assertEquals(proj.params, ["zone=26", "proj=utm", "ellps=clrk66"])          proj = Projection(params)
47            self.assertEquals(proj.params, params)
48    
49          # It's not clear whether this value is really the correct one          # It's not clear whether this value is really the correct one
50          # but a test failure here probably still means a bug somewhere          # but a test failure here probably still means a bug somewhere
# Line 43  class TestProjection(unittest.TestCase, Line 58  class TestProjection(unittest.TestCase,
58                                   (3620891.3077618643, 0.0,                                   (3620891.3077618643, 0.0,
59                                    3875381.8535437919, 252962.10480170773),                                    3875381.8535437919, 252962.10480170773),
60                                   epsilon = 1e-5)                                   epsilon = 1e-5)
61            self.assertFloatSeqEqual(proj.InverseBBox((3620891.3077618643, 0.0,
62                                                       3875381.8535437919,
63                                                       252962.10480170773)),
64                                     (-0.018341599754143501, 0.0,
65                                      2.017992992681688, 2.0377390677846736),
66                                     epsilon = 1e-5)
67    
68            # GetName()
69            self.assertEquals(proj.GetName(), _("Unknown"))
70    
71            # GetParameter()
72            self.assertEquals(proj.GetParameter("zone"), "26")
73            self.assertEquals(proj.GetParameter("proj"), "utm")
74            self.assertEquals(proj.GetParameter("ellps"), "clrk66")
75            self.assertEquals(proj.GetParameter("hallo"), "")
76    
77            # GetAllParameters()
78            self.assertEquals(proj.GetAllParameters(), params)
79    
80            # GetName()
81            proj = Projection(params, "MyName")
82            self.assertEquals(proj.GetName(), "MyName")
83    
84        def test_get_parameter_without_equals_sign(self):
85            """Test Projection.GetParameter() for a parameter without '=' sign"""
86            proj = Projection(["proj=utm", "zone=34", "south", "ellps=clrk66"])
87            # The Projection class pretends that for parameters specified
88            # without a value the value is the same as the parameter name.
89            self.assertEquals(proj.GetParameter("south"), "south")
90    
91        def test_get_projection_units_geo(self):
92            """Test Projection.GetProjectedUnits() for geographic projection.
93            Test for the alias 'longlat' as well.
94            """
95            proj = Projection(["proj=latlong", "to_meter=0.017453292519943295",
96                               "ellps=clrk66"])
97            self.assertEquals(proj.GetProjectedUnits(), PROJ_UNITS_DEGREES)
98            proj = Projection(["proj=longlat", "to_meter=0.017453292519943295",
99                               "ellps=clrk66"])
100            self.assertEquals(proj.GetProjectedUnits(), PROJ_UNITS_DEGREES)
101    
102        def test_lc_numeric_robustness(self):
103            """Test if an LC_NUMERIC local with comma as decimal_point will work.
104    
105            Some versions of proj are not robust against this.
106            Starting with Python 2.4 there is a different behaviour when
107            calling C extensions and now they will see changes locales settings
108            which might tickle the bug in proj.
109            """
110            params = ["proj=latlong", "to_meter=0.01745", "ellps=clrk66"]
111    
112            oldlocale = localessupport.setdecimalcommalocale()
113            if oldlocale == None:
114                raise support.SkipTest(
115                        "No locale with comma as decimal_point found.")
116    
117            proj = Projection(params)
118            #print proj.work_around_broken_proj
119            result1 =  proj.Forward(1.2,3.2)
120    
121            locale.setlocale(locale.LC_NUMERIC, "C")
122            proj = Projection(params)
123            result2= proj.Forward(1.2,3.2)
124    
125            locale.setlocale(locale.LC_NUMERIC, oldlocale)
126            self.assertFloatSeqEqual(result1, result2, epsilon = 1e-5 )
127    
128        def test_get_projection_units_normal(self):
129            """Test Projection.GetProjectedUnits() for normal projection"""
130            proj = Projection(["zone=26", "proj=utm", "ellps=clrk66"])
131            self.assertEquals(proj.GetProjectedUnits(), PROJ_UNITS_METERS)
132    
133        def test_label(self):
134            """Test Projection.Label() without epsg"""
135            proj = Projection(["zone=26", "proj=utm", "ellps=clrk66"],
136                               name = "My Projection")
137            self.assertEquals(proj.Label(), "My Projection")
138    
139        def test_label_epsg(self):
140            """Test Projection.Label() with epsg"""
141            proj = Projection(["zone=26", "proj=utm", "ellps=clrk66"],
142                               name = "My Projection", epsg="42")
143            self.assertEquals(proj.Label(), "EPSG    42 My Projection")
144    
145        def test_epsgcode_for_non_epsg_projection(self):
146            """Test Projection.EPSGCode() without epsg"""
147            proj = Projection(["zone=26", "proj=utm", "ellps=clrk66"],
148                               name = "My Projection")
149            self.assertEquals(proj.EPSGCode(), None)
150    
151        def test_epsgcode_for_real_epsg_projection(self):
152            """Test Projection.EPSGCode() with epsg"""
153            proj = Projection(["zone=26", "proj=utm", "ellps=clrk66"],
154                               name = "My Projection", epsg="42")
155            self.assertEquals(proj.EPSGCode(), "42")
156    
157    
158    
159    class TestProjFileSimple:
160    
161        def test_init(self):
162            """Test ProjFile coinstructor"""
163            proj_file = ProjFile("some_filename")
164            self.assertEquals(proj_file.GetFilename(), "some_filename")
165            self.assertEquals(len(proj_file.GetProjections()), 0)
166    
167        def test_set_filename(self):
168            """Test ProjFile.SetFilename()"""
169            proj_file = ProjFile("some_filename")
170            proj.SetFilename("other_name")
171            self.assertEquals(proj_file.GetFilename(), "other_name")
172    
173    
174    class TestProjFile(unittest.TestCase, support.SubscriberMixin):
175    
176        """Test cases for ProjFile objects"""
177    
178        def setUp(self):
179            self.clear_messages()
180            self.proj0 = Projection(["proj=tmerc", "ellps=clrk66"])
181            self.proj1 = Projection(["proj=utm", "ellps=clrk66"])
182            self.proj2 = Projection(["proj=lcc", "ellps=clrk66",
183                                     "lat_1=0", "lat_2=20"])
184            self.proj_file = ProjFile("some_filename")
185            for msg in [PROJECTION_ADDED, PROJECTION_REMOVED, PROJECTION_REPLACED]:
186                self.proj_file.Subscribe(msg, self.subscribe_with_params, msg)
187    
188        def tearDown(self):
189            self.clear_messages()
190            self.proj_file.Destroy()
191    
192        def test_add_remove(self):
193            """Test ProjFile.Add() and ProjFile.Remove()"""
194            self.proj_file.Add(self.proj0)
195            self.proj_file.Add(self.proj1)
196            self.assertEquals(self.proj_file.GetProjections(),
197                              [self.proj0, self.proj1])
198            self.check_messages([(self.proj0, PROJECTION_ADDED),
199                                 (self.proj1, PROJECTION_ADDED)])
200            self.clear_messages()
201    
202            self.proj_file.Remove(self.proj0)
203            self.assertEquals(self.proj_file.GetProjections(), [self.proj1])
204            self.check_messages([(self.proj0, PROJECTION_REMOVED)])
205    
206        def test_remove_non_existing(self):
207            """Test ProjFile.Remove(<proj not in projfile>)"""
208            self.assertRaises(ValueError, self.proj_file.Remove, self.proj0)
209            # Nothing happened, so no messages should have been sent
210            self.check_messages([])
211    
212        def test_replace(self):
213            """Test ProjFile.Replace()"""
214            self.proj_file.Add(self.proj0)
215            self.proj_file.Add(self.proj1)
216            self.clear_messages()
217    
218            # Replace()
219            self.proj_file.Replace(self.proj0, self.proj2)
220            self.assertEquals(self.proj_file.GetProjections(),
221                              [self.proj2, self.proj1])
222            self.check_messages([(self.proj0, self.proj2, PROJECTION_REPLACED)])
223    
224        def test_replace_non_existing(self):
225            """Test ProjFile.Replace(<proj not in projfile>, <some proj>)"""
226            self.proj_file.Add(self.proj0)
227            self.proj_file.Add(self.proj1)
228            self.clear_messages()
229            self.assertRaises(ValueError,
230                              self.proj_file.Replace, self.proj2, self.proj0)
231            # All projections should still be there
232            self.assertEquals(self.proj_file.GetProjections(),
233                              [self.proj0, self.proj1])
234            # Nothing happened, so no messages should have been sent
235            self.check_messages([])
236    
237    
238    class ProjFileTest(unittest.TestCase, support.FileTestMixin,
239                       xmlsupport.ValidationTest):
240    
241        """Base class for the proj file tests that read or write files"""
242    
243        def filename(self):
244            """Return the filename for the test"""
245            return self.temp_file_name(self.id() + ".proj")
246    
247    
248    class ProjFileReadTests(ProjFileTest):
249    
250        """Test read ProjFile objects from files
251    
252        The files only cover error handling and the system projection file.
253        """
254    
255        def test_read_non_existing_file(self):
256            """Test read_proj_file with non-existing file"""
257            self.assertRaises(IOError,
258                              resource.read_proj_file,
259                              self.temp_file_name("nonexistent.proj"))
260    
261        def test_read_unreadable_file(self):
262            """Test read_proj_file with unreadable file
263    
264            As currently written this only works on unix-like systems and
265            not e.g. on MS Windows.
266            """
267            if os.name != "posix":
268                raise support.SkipTest("Test only works on posix systems")
269            filename = self.filename()
270            file = open(filename, "w")
271            file.close()
272            os.chmod(filename, 0200) # write-only
273            self.assertRaises(IOError, resource.read_proj_file, filename)
274    
275        def test_read_empty_file(self):
276            """Test read_proj_file with empty file"""
277            filename = self.filename()
278            file = open(filename, "w")
279            file.close()
280    
281            self.assertRaises(SAXParseException, resource.read_proj_file, filename)
282    
283        def test_get_system_proj_file(self):
284            """Test resource.get_system_proj_file(DEFAULT_PROJ_FILE)
285    
286            This is primarily to test whether the system proj file contains
287            invalid projection paramers and whether the proj file is not
288            empty
289            """
290            projfile, warnings\
291                      = resource.get_system_proj_file(resource.DEFAULT_PROJ_FILE)
292            self.assertEquals(warnings, [])
293            self.assert_(len(projfile.GetProjections()) > 0)
294    
295            # see whether it got cached and we get the same projfile object
296            # when we read the file again
297            projfile2, warnings \
298                       = resource.get_system_proj_file(resource.DEFAULT_PROJ_FILE)
299            self.assert_(projfile is projfile2)
300    
301    
302    class WriteProjFileTests(ProjFileTest):
303    
304        """Test cases for writing proj files"""
305    
306        def compare_xml(self, xml1, xml2):
307            self.assertEquals(sax_eventlist(xml1), sax_eventlist(xml2))
308    
309        def doTestWrite(self, projfile, expected):
310            filename = self.filename()
311    
312            resource.write_proj_file(projfile)
313    
314            file = open(filename)
315            written_contents = file.read()
316            file.close()
317            self.compare_xml(written_contents, expected)
318            self.validate_data(written_contents)
319            self.validate_data(expected)
320    
321        def test_write(self):
322            """Test write_proj_file"""
323            pf = ProjFile(self.filename())
324            pf.Add(Projection(['proj=tmerc', 'ellps=clrk66',
325                               'lat_0=90w', 'lon_0=90w', 'k=1'],
326                              "Transverse Mercator",))
327            pf.Add(Projection(["proj=tmerc",
328                               "lat_0=0.000000000", "lon_0=-62.000000000",
329                               "k=0.999500", "x_0=400000.000", "y_0=0.000",
330                               "ellps=clrk80", "units=m"],
331                              "Anguilla 1957 / British West Indies Grid",
332                              epsg="200"))
333            file_contents = '''<?xml version="1.0" encoding="UTF-8"?>
334            <!DOCTYPE projectionlist SYSTEM "projfile.dtd">
335            <projectionlist>
336                <projection name="Transverse Mercator">
337                    <parameter value="proj=tmerc"/>
338                    <parameter value="ellps=clrk66"/>
339                    <parameter value="lat_0=90w"/>
340                    <parameter value="lon_0=90w"/>
341                    <parameter value="k=1"/>
342                </projection>
343                <projection epsg="200"
344                            name="Anguilla 1957 / British West Indies Grid">
345                    <parameter value="proj=tmerc"/>
346                    <parameter value="lat_0=0.000000000"/>
347                    <parameter value="lon_0=-62.000000000"/>
348                    <parameter value="k=0.999500"/>
349                    <parameter value="x_0=400000.000"/>
350                    <parameter value="y_0=0.000"/>
351                    <parameter value="ellps=clrk80"/>
352                    <parameter value="units=m"/>
353                </projection>
354            </projectionlist>
355            '''
356            self.doTestWrite(pf, file_contents)
357    
358        def test_write_empty_file(self):
359            """Test write empty ProjFile"""
360            pf = ProjFile(self.filename())
361            file_contents = '''<?xml version="1.0" encoding="UTF-8"?>
362            <!DOCTYPE projectionlist SYSTEM "projfile.dtd">
363            <projectionlist>
364            </projectionlist>
365            '''
366            self.doTestWrite(pf, file_contents)
367    
368    
369    class ProjFileLoadTestCase(support.FileLoadTestCase):
370    
371        """Base class for the test cases that read specific test files"""
372    
373        file_extension = ".proj"
374    
375        def tearDown(self):
376            """Clear the cache explicitly"""
377            resource.clear_proj_file_cache()
378    
379    
380    class TestLoadingProjFile(ProjFileLoadTestCase):
381    
382        file_contents = '''\
383    <?xml version="1.0" encoding="UTF-8"?>
384    <!DOCTYPE projectionlist SYSTEM "projfile.dtd">
385    <projectionlist>
386        <projection name="Transverse Mercator">
387            <parameter value="proj=tmerc"/>
388            <parameter value="ellps=clrk66"/>
389            <parameter value="lat_0=90w"/>
390            <parameter value="lon_0=90w"/>
391            <parameter value="k=1"/>
392        </projection>
393        <projection epsg="200" name="Anguilla 1957 / British West Indies Grid">
394            <parameter value="proj=tmerc"/>
395            <parameter value="lat_0=0.000000000"/>
396            <parameter value="lon_0=-62.000000000"/>
397            <parameter value="k=0.999500"/>
398            <parameter value="x_0=400000.000"/>
399            <parameter value="y_0=0.000"/>
400            <parameter value="ellps=clrk80"/>
401            <parameter value="units=m"/>
402        </projection>
403    </projectionlist>
404    '''
405    
406        def check_projection(self, proj, label, parameters):
407            """Check the values of the proj's label and parameters"""
408            self.assertEquals(proj.Label(), label)
409            params = proj.GetAllParameters()[:]
410            params.sort()
411            self.assertEquals(params, parameters)
412    
413        def test(self):
414            projfile, warnings = resource.read_proj_file(self.filename())
415            # no warnings
416            self.assertEquals(warnings, [])
417    
418            # There are two projections
419            projs = projfile.GetProjections()
420            self.assertEquals(len(projs), 2)
421    
422            self.check_projection(projs[0],
423                                  "Transverse Mercator",
424                                  ['ellps=clrk66', 'k=1', 'lat_0=90w', 'lon_0=90w',
425                                   'proj=tmerc'])
426            self.check_projection(projs[1],
427                             "EPSG   200 Anguilla 1957 / British West Indies Grid",
428                                  ["ellps=clrk80", "k=0.999500",
429                                   "lat_0=0.000000000", "lon_0=-62.000000000",
430                                   "proj=tmerc", "units=m",
431                                   "x_0=400000.000", "y_0=0.000"])
432    
433        def test_caching(self):
434            # test whether the projfile cache works
435            projfile, warnings = resource.read_proj_file(self.filename())
436            projfile2, warnings = resource.read_proj_file(self.filename())
437    
438            # Both projfiles should be the same object
439            self.assert_(projfile2 is projfile)
440    
441            # If we clear the cache we should get a new one.
442            resource.clear_proj_file_cache()
443            projfile3, warnings = resource.read_proj_file(self.filename())
444            self.assert_(projfile3 is not projfile)
445    
446    
447    class TestLoadingProjFileWithEmptyProjectionlist(ProjFileLoadTestCase):
448    
449        file_contents = '''\
450    <?xml version="1.0" encoding="UTF-8"?>
451    <!DOCTYPE projectionlist SYSTEM "projfile.dtd">
452    <projectionlist>
453    </projectionlist>
454    '''
455    
456        def test(self):
457            projfile, warnings = resource.read_proj_file(self.filename())
458            # no warnings
459            self.assertEquals(warnings, [])
460    
461            # There are no projections
462            self.assertEquals(len(projfile.GetProjections()), 0)
463    
464    
465    class TestProjFileWithInvalidParameters(ProjFileLoadTestCase):
466    
467        file_contents = '''\
468    <?xml version="1.0" encoding="UTF-8"?>
469    <!DOCTYPE projectionlist SYSTEM "projfile.dtd">
470    <projectionlist>
471        <projection name="Universal Transverse Mercator">
472            <parameter value="proj=utm"/>
473            <parameter value="ellps=clrk66"/>
474            <!-- an invalid zone number to trigger the parameter checking
475                 in the proj library -->
476            <parameter value="zone=1000"/>
477        </projection>
478        <projection name="Transverse Mercator">
479            <parameter value="proj=tmerc"/>
480            <parameter value="ellps=clrk66"/>
481            <parameter value="lat_0=90w"/>
482            <parameter value="lon_0=90w"/>
483            <parameter value="k=1"/>
484        </projection>
485    </projectionlist>
486    '''
487    
488        def setUp(self):
489            support.FileLoadTestCase.setUp(self)
490    
491        def test(self):
492            """Test reading a proj file with invalid parameters"""
493            projfile, warnings = resource.read_proj_file(self.filename())
494            projs = projfile.GetProjections()
495            self.assertEquals(len(projs), 1)
496            params = projs[0].GetAllParameters()[:]
497            params.sort()
498            self.assertEquals(params, ['ellps=clrk66', 'k=1', 'lat_0=90w',
499                                       'lon_0=90w', 'proj=tmerc'])
500            self.assertEquals(warnings,
501                           ['Error in projection "Universal Transverse Mercator":'
502                            ' invalid UTM zone number'])
503    
504    
505  if __name__ == "__main__":  if __name__ == "__main__":
506      unittest.main()      support.run_tests()
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