def test_at_equator(self):
"""
Tests the function convert_circle_to_rectangle at the Equator.
This makes it easier to calculate expected values.
"""
coord = (-78.0, 0)
radius_m = 10000
square = shapes.convert_circle_to_rectangle(coord, radius_m)
# check that the shape is correct
self.assertEqual(shapes.is_rectangle(square[0]), True,
'Shape is not a rectangle')
# check that the rectangle center is at the original point
bounds = Bounds(*square.extent)
self.assertAlmostEqual(square.centroid[0], coord[0], places=6,
msg='The center longitude is incorrect')
self.assertAlmostEqual(square.centroid[1], coord[1], places=6,
msg='The center latitude is incorrect')
# check that rectangle has the correct area
area_in_sq_m = bounds.center_width_m * bounds.height_m
actual_sq_km = units.sq_meters_to_sq_km(area_in_sq_m)
expected_sq_km = (2 * radius_m / 1000)**2
self.assertAlmostEqual(actual_sq_km, expected_sq_km, delta=0.001)
# check that the rectangle contains the circle
radius_in_degrees = units.convert_meters_to_degrees(radius_m, 'down')
point = Point(coord)
circle = point.buffer(radius_in_degrees)
self.assertTrue(square.contains(circle))
def test_1000_sq_meters(self):
"""
Test case for 1000 square meters.
"""
self.assertEqual(units.sq_meters_to_sq_km(1000), 0.001)
def test_float_input(self):
"""
Test case for floating point input.
"""
self.assertEqual(units.sq_meters_to_sq_km(0.5), 0.0000005)
def test_0_sq_meters(self):
"""
Test case for 0 square meters.
"""
self.assertEqual(units.sq_meters_to_sq_km(0), 0)
