app/django/contrib/gis/tests/test_measure.py
author Lennard de Rijk <ljvderijk@gmail.com>
Tue, 07 Apr 2009 21:40:23 +0000
changeset 2121 4f6344dfab28
parent 323 ff1a9aa48cfd
permissions -rw-r--r--
Added list of projects to the organization home page. Only projects that have not failed will be shown here. The list will link to each project public page which will contain the necessary info about the project. Addresses part of Issue 491. Patch by: Madhusudan C.S Reviewed by: Lennard de Rijk

"""
Distance and Area objects to allow for sensible and convienient calculation 
and conversions. Here are some tests.
"""

import unittest
from django.contrib.gis.measure import Distance, Area, D, A

class DistanceTest(unittest.TestCase):
    "Testing the Distance object"

    def testInit(self):
        "Testing initialisation from valid units"
        d = Distance(m=100)
        self.assertEqual(d.m, 100)

        d1, d2, d3 = D(m=100), D(meter=100), D(metre=100)
        for d in (d1, d2, d3):
            self.assertEqual(d.m, 100)

        d = D(nm=100)
        self.assertEqual(d.m, 185200)

        y1, y2, y3 = D(yd=100), D(yard=100), D(Yard=100)
        for d in (y1, y2, y3):
            self.assertEqual(d.yd, 100)

        mm1, mm2 = D(millimeter=1000), D(MiLLiMeTeR=1000)
        for d in (mm1, mm2):
            self.assertEqual(d.m, 1.0)
            self.assertEqual(d.mm, 1000.0)

    
    def testInitInvalid(self):
        "Testing initialisation from invalid units"
        self.assertRaises(AttributeError, D, banana=100)

    def testAccess(self):
        "Testing access in different units"
        d = D(m=100)
        self.assertEqual(d.km, 0.1)
        self.assertAlmostEqual(d.ft, 328.084, 3)
    
    def testAccessInvalid(self):
        "Testing access in invalid units"
        d = D(m=100)
        self.failIf(hasattr(d, 'banana'))

    def testAddition(self):
        "Test addition & subtraction"
        d1 = D(m=100)
        d2 = D(m=200)

        d3 = d1 + d2
        self.assertEqual(d3.m, 300)
        d3 += d1
        self.assertEqual(d3.m, 400)
        
        d4 = d1 - d2
        self.assertEqual(d4.m, -100)
        d4 -= d1
        self.assertEqual(d4.m, -200)
        
        try:
            d5 = d1 + 1
        except TypeError, e:
            pass
        else:
            self.fail('Distance + number should raise TypeError')

        try:
            d5 = d1 - 1
        except TypeError, e:
            pass
        else:
            self.fail('Distance - number should raise TypeError')

        try:
            d1 += 1
        except TypeError, e:
            pass
        else:
            self.fail('Distance += number should raise TypeError')

        try:
            d1 -= 1
        except TypeError, e:
            pass
        else:
            self.fail('Distance -= number should raise TypeError')
            
    def testMultiplication(self):
        "Test multiplication & division"
        d1 = D(m=100)

        d3 = d1 * 2
        self.assertEqual(d3.m, 200)
        d3 *= 5
        self.assertEqual(d3.m, 1000)
        
        d4 = d1 / 2
        self.assertEqual(d4.m, 50)
        d4 /= 5
        self.assertEqual(d4.m, 10)
        
        a5 = d1 * D(m=10)
        self.assert_(isinstance(a5, Area))
        self.assertEqual(a5.sq_m, 100*10)

        try:
            d1 *= D(m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Distance *= Distance should raise TypeError')
            
        try:
            d5 = d1 / D(m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Distance / Distance should raise TypeError')

        try:
            d1 /= D(m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Distance /= Distance should raise TypeError')

    def testUnitConversions(self):
        "Testing default units during maths"
        d1 = D(m=100)
        d2 = D(km=1)

        d3 = d1 + d2
        self.assertEqual(d3._default_unit, 'm')
        d4 = d2 + d1
        self.assertEqual(d4._default_unit, 'km')
        d5 = d1 * 2
        self.assertEqual(d5._default_unit, 'm')
        d6 = d1 / 2
        self.assertEqual(d6._default_unit, 'm')
    
    def testComparisons(self):
        "Testing comparisons"
        d1 = D(m=100)
        d2 = D(km=1)
        d3 = D(km=0)
        
        self.assert_(d2 > d1)
        self.assert_(d1 == d1)
        self.assert_(d1 < d2)
        self.failIf(d3)
        
    def testUnitsStr(self):
        "Testing conversion to strings"
        d1 = D(m=100)
        d2 = D(km=3.5)
        
        self.assertEqual(str(d1), '100.0 m')
        self.assertEqual(str(d2), '3.5 km')
        self.assertEqual(repr(d1), 'Distance(m=100.0)')
        self.assertEqual(repr(d2), 'Distance(km=3.5)')

    def testUnitAttName(self):
        "Testing the `unit_attname` class method"
        unit_tuple = [('Yard', 'yd'), ('Nautical Mile', 'nm'), ('German legal metre', 'german_m'),
                      ('Indian yard', 'indian_yd'), ('Chain (Sears)', 'chain_sears'), ('Chain', 'chain')]
        for nm, att in unit_tuple:
            self.assertEqual(att, D.unit_attname(nm))

class AreaTest(unittest.TestCase):
    "Testing the Area object"

    def testInit(self):
        "Testing initialisation from valid units"
        a = Area(sq_m=100)
        self.assertEqual(a.sq_m, 100)

        a = A(sq_m=100)
        self.assertEqual(a.sq_m, 100)

        a = A(sq_mi=100)
        self.assertEqual(a.sq_m, 258998811.0336)
    
    def testInitInvaliA(self):
        "Testing initialisation from invalid units"
        self.assertRaises(AttributeError, A, banana=100)

    def testAccess(self):
        "Testing access in different units"
        a = A(sq_m=100)
        self.assertEqual(a.sq_km, 0.0001)
        self.assertAlmostEqual(a.sq_ft, 1076.391, 3)
    
    def testAccessInvaliA(self):
        "Testing access in invalid units"
        a = A(sq_m=100)
        self.failIf(hasattr(a, 'banana'))

    def testAddition(self):
        "Test addition & subtraction"
        a1 = A(sq_m=100)
        a2 = A(sq_m=200)

        a3 = a1 + a2
        self.assertEqual(a3.sq_m, 300)
        a3 += a1
        self.assertEqual(a3.sq_m, 400)
        
        a4 = a1 - a2
        self.assertEqual(a4.sq_m, -100)
        a4 -= a1
        self.assertEqual(a4.sq_m, -200)
        
        try:
            a5 = a1 + 1
        except TypeError, e:
            pass
        else:
            self.fail('Area + number should raise TypeError')

        try:
            a5 = a1 - 1
        except TypeError, e:
            pass
        else:
            self.fail('Area - number should raise TypeError')

        try:
            a1 += 1
        except TypeError, e:
            pass
        else:
            self.fail('Area += number should raise TypeError')

        try:
            a1 -= 1
        except TypeError, e:
            pass
        else:
            self.fail('Area -= number should raise TypeError')
            
    def testMultiplication(self):
        "Test multiplication & division"
        a1 = A(sq_m=100)

        a3 = a1 * 2
        self.assertEqual(a3.sq_m, 200)
        a3 *= 5
        self.assertEqual(a3.sq_m, 1000)
        
        a4 = a1 / 2
        self.assertEqual(a4.sq_m, 50)
        a4 /= 5
        self.assertEqual(a4.sq_m, 10)
        
        try:
            a5 = a1 * A(sq_m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Area * Area should raise TypeError')

        try:
            a1 *= A(sq_m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Area *= Area should raise TypeError')
            
        try:
            a5 = a1 / A(sq_m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Area / Area should raise TypeError')

        try:
            a1 /= A(sq_m=1)
        except TypeError, e:
            pass
        else:
            self.fail('Area /= Area should raise TypeError')

    def testUnitConversions(self):
        "Testing default units during maths"
        a1 = A(sq_m=100)
        a2 = A(sq_km=1)

        a3 = a1 + a2
        self.assertEqual(a3._default_unit, 'sq_m')
        a4 = a2 + a1
        self.assertEqual(a4._default_unit, 'sq_km')
        a5 = a1 * 2
        self.assertEqual(a5._default_unit, 'sq_m')
        a6 = a1 / 2
        self.assertEqual(a6._default_unit, 'sq_m')
    
    def testComparisons(self):
        "Testing comparisons"
        a1 = A(sq_m=100)
        a2 = A(sq_km=1)
        a3 = A(sq_km=0)
        
        self.assert_(a2 > a1)
        self.assert_(a1 == a1)
        self.assert_(a1 < a2)
        self.failIf(a3)
        
    def testUnitsStr(self):
        "Testing conversion to strings"
        a1 = A(sq_m=100)
        a2 = A(sq_km=3.5)
        
        self.assertEqual(str(a1), '100.0 sq_m')
        self.assertEqual(str(a2), '3.5 sq_km')
        self.assertEqual(repr(a1), 'Area(sq_m=100.0)')
        self.assertEqual(repr(a2), 'Area(sq_km=3.5)')

        
def suite():
    s = unittest.TestSuite()
    s.addTest(unittest.makeSuite(DistanceTest))
    s.addTest(unittest.makeSuite(AreaTest))
    return s

def run(verbosity=2):
    unittest.TextTestRunner(verbosity=verbosity).run(suite())

if __name__=="__main__":
    run()