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import warnings
import sys

import numpy as np
from numpy.testing import *
import unittest

class _GenericTest(object):
    def _test_equal(self, a, b):
        self._assert_func(a, b)

    def _test_not_equal(self, a, b):
        try:
            self._assert_func(a, b)
            passed = True
        except AssertionError:
            pass
        else:
            raise AssertionError("a and b are found equal but are not")

    def test_array_rank1_eq(self):
        """Test two equal array of rank 1 are found equal."""
        a = np.array([1, 2])
        b = np.array([1, 2])

        self._test_equal(a, b)

    def test_array_rank1_noteq(self):
        """Test two different array of rank 1 are found not equal."""
        a = np.array([1, 2])
        b = np.array([2, 2])

        self._test_not_equal(a, b)

    def test_array_rank2_eq(self):
        """Test two equal array of rank 2 are found equal."""
        a = np.array([[1, 2], [3, 4]])
        b = np.array([[1, 2], [3, 4]])

        self._test_equal(a, b)

    def test_array_diffshape(self):
        """Test two arrays with different shapes are found not equal."""
        a = np.array([1, 2])
        b = np.array([[1, 2], [1, 2]])

        self._test_not_equal(a, b)

    def test_objarray(self):
        """Test object arrays."""
        a = np.array([1, 1], dtype=np.object)
        self._test_equal(a, 1)

class TestArrayEqual(_GenericTest, unittest.TestCase):
    def setUp(self):
        self._assert_func = assert_array_equal

    def test_generic_rank1(self):
        """Test rank 1 array for all dtypes."""
        def foo(t):
            a = np.empty(2, t)
            a.fill(1)
            b = a.copy()
            c = a.copy()
            c.fill(0)
            self._test_equal(a, b)
            self._test_not_equal(c, b)

        # Test numeric types and object
        for t in '?bhilqpBHILQPfdgFDG':
            foo(t)

        # Test strings
        for t in ['S1', 'U1']:
            foo(t)

    def test_generic_rank3(self):
        """Test rank 3 array for all dtypes."""
        def foo(t):
            a = np.empty((4, 2, 3), t)
            a.fill(1)
            b = a.copy()
            c = a.copy()
            c.fill(0)
            self._test_equal(a, b)
            self._test_not_equal(c, b)

        # Test numeric types and object
        for t in '?bhilqpBHILQPfdgFDG':
            foo(t)

        # Test strings
        for t in ['S1', 'U1']:
            foo(t)

    def test_nan_array(self):
        """Test arrays with nan values in them."""
        a = np.array([1, 2, np.nan])
        b = np.array([1, 2, np.nan])

        self._test_equal(a, b)

        c = np.array([1, 2, 3])
        self._test_not_equal(c, b)

    def test_string_arrays(self):
        """Test two arrays with different shapes are found not equal."""
        a = np.array(['floupi', 'floupa'])
        b = np.array(['floupi', 'floupa'])

        self._test_equal(a, b)

        c = np.array(['floupipi', 'floupa'])

        self._test_not_equal(c, b)

    def test_recarrays(self):
        """Test record arrays."""
        a = np.empty(2, [('floupi', np.float), ('floupa', np.float)])
        a['floupi'] = [1, 2]
        a['floupa'] = [1, 2]
        b = a.copy()

        self._test_equal(a, b)

        c = np.empty(2, [('floupipi', np.float), ('floupa', np.float)])
        c['floupipi'] = a['floupi'].copy()
        c['floupa'] = a['floupa'].copy()

        self._test_not_equal(c, b)

class TestEqual(TestArrayEqual):
    def setUp(self):
        self._assert_func = assert_equal

    def test_nan_items(self):
        self._assert_func(np.nan, np.nan)
        self._assert_func([np.nan], [np.nan])
        self._test_not_equal(np.nan, [np.nan])
        self._test_not_equal(np.nan, 1)

    def test_inf_items(self):
        self._assert_func(np.inf, np.inf)
        self._assert_func([np.inf], [np.inf])
        self._test_not_equal(np.inf, [np.inf])

    def test_non_numeric(self):
        self._assert_func('ab', 'ab')
        self._test_not_equal('ab', 'abb')

    def test_complex_item(self):
        self._assert_func(complex(1, 2), complex(1, 2))
        self._assert_func(complex(1, np.nan), complex(1, np.nan))
        self._test_not_equal(complex(1, np.nan), complex(1, 2))
        self._test_not_equal(complex(np.nan, 1), complex(1, np.nan))
        self._test_not_equal(complex(np.nan, np.inf), complex(np.nan, 2))

    def test_negative_zero(self):
        self._test_not_equal(np.PZERO, np.NZERO)

    def test_complex(self):
        x = np.array([complex(1, 2), complex(1, np.nan)])
        y = np.array([complex(1, 2), complex(1, 2)])
        self._assert_func(x, x)
        self._test_not_equal(x, y)

class TestArrayAlmostEqual(_GenericTest, unittest.TestCase):
    def setUp(self):
        self._assert_func = assert_array_almost_equal

    def test_simple(self):
        x = np.array([1234.2222])
        y = np.array([1234.2223])

        self._assert_func(x, y, decimal=3)
        self._assert_func(x, y, decimal=4)
        self.failUnlessRaises(AssertionError,
                lambda: self._assert_func(x, y, decimal=5))

    def test_nan(self):
        anan = np.array([np.nan])
        aone = np.array([1])
        ainf = np.array([np.inf])
        self._assert_func(anan, anan)
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(anan, aone))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(anan, ainf))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(ainf, anan))

class TestAlmostEqual(_GenericTest, unittest.TestCase):
    def setUp(self):
        self._assert_func = assert_almost_equal

    def test_nan_item(self):
        self._assert_func(np.nan, np.nan)
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(np.nan, 1))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(np.nan, np.inf))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(np.inf, np.nan))

    def test_inf_item(self):
        self._assert_func(np.inf, np.inf)
        self._assert_func(-np.inf, -np.inf)

    def test_simple_item(self):
        self._test_not_equal(1, 2)

    def test_complex_item(self):
        self._assert_func(complex(1, 2), complex(1, 2))
        self._assert_func(complex(1, np.nan), complex(1, np.nan))
        self._assert_func(complex(np.inf, np.nan), complex(np.inf, np.nan))
        self._test_not_equal(complex(1, np.nan), complex(1, 2))
        self._test_not_equal(complex(np.nan, 1), complex(1, np.nan))
        self._test_not_equal(complex(np.nan, np.inf), complex(np.nan, 2))

    def test_complex(self):
        x = np.array([complex(1, 2), complex(1, np.nan)])
        z = np.array([complex(1, 2), complex(np.nan, 1)])
        y = np.array([complex(1, 2), complex(1, 2)])
        self._assert_func(x, x)
        self._test_not_equal(x, y)
        self._test_not_equal(x, z)

class TestApproxEqual(unittest.TestCase):
    def setUp(self):
        self._assert_func = assert_approx_equal

    def test_simple_arrays(self):
        x = np.array([1234.22])
        y = np.array([1234.23])

        self._assert_func(x, y, significant=5)
        self._assert_func(x, y, significant=6)
        self.failUnlessRaises(AssertionError,
                lambda: self._assert_func(x, y, significant=7))

    def test_simple_items(self):
        x = 1234.22
        y = 1234.23

        self._assert_func(x, y, significant=4)
        self._assert_func(x, y, significant=5)
        self._assert_func(x, y, significant=6)
        self.failUnlessRaises(AssertionError,
                lambda: self._assert_func(x, y, significant=7))

    def test_nan_array(self):
        anan = np.array(np.nan)
        aone = np.array(1)
        ainf = np.array(np.inf)
        self._assert_func(anan, anan)
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(anan, aone))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(anan, ainf))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(ainf, anan))

    def test_nan_items(self):
        anan = np.array(np.nan)
        aone = np.array(1)
        ainf = np.array(np.inf)
        self._assert_func(anan, anan)
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(anan, aone))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(anan, ainf))
        self.failUnlessRaises(AssertionError,
                lambda : self._assert_func(ainf, anan))

class TestRaises(unittest.TestCase):
    def setUp(self):
        class MyException(Exception):
            pass

        self.e = MyException

    def raises_exception(self, e):
        raise e

    def does_not_raise_exception(self):
        pass

    def test_correct_catch(self):
        f = raises(self.e)(self.raises_exception)(self.e)

    def test_wrong_exception(self):
        try:
            f = raises(self.e)(self.raises_exception)(RuntimeError)
        except RuntimeError:
            return
        else:
            raise AssertionError("should have caught RuntimeError")

    def test_catch_no_raise(self):
        try:
            f = raises(self.e)(self.does_not_raise_exception)()
        except AssertionError:
            return
        else:
            raise AssertionError("should have raised an AssertionError")

class TestWarns(unittest.TestCase):
    def test_warn(self):
        def f():
            warnings.warn("yo")

        before_filters = sys.modules['warnings'].filters[:]
        assert_warns(UserWarning, f)
        after_filters = sys.modules['warnings'].filters

        # Check that the warnings state is unchanged
        assert_equal(before_filters, after_filters,
                     "assert_warns does not preserver warnings state")

    def test_warn_wrong_warning(self):
        def f():
            warnings.warn("yo", DeprecationWarning)

        failed = False
        filters = sys.modules['warnings'].filters[:]
        try:
            try:
                # Should raise an AssertionError
                assert_warns(UserWarning, f)
                failed = True
            except AssertionError:
                pass
        finally:
            sys.modules['warnings'].filters = filters

        if failed:
            raise AssertionError("wrong warning caught by assert_warn")

class TestArrayAlmostEqualNulp(unittest.TestCase):
    def test_simple(self):
        dev = np.random.randn(10)
        x = np.ones(10)
        y = x + dev * np.finfo(np.float64).eps
        assert_array_almost_equal_nulp(x, y, nulp=2 * np.max(dev))

    def test_simple2(self):
        x = np.random.randn(10)
        y = 2 * x
        def failure():
            return assert_array_almost_equal_nulp(x, y,
                                                  nulp=1000)
        self.failUnlessRaises(AssertionError, failure)

    def test_big_float32(self):
        x = (1e10 * np.random.randn(10)).astype(np.float32)
        y = x + 1
        assert_array_almost_equal_nulp(x, y, nulp=1000)

    def test_big_float64(self):
        x = 1e10 * np.random.randn(10)
        y = x + 1
        def failure():
            assert_array_almost_equal_nulp(x, y, nulp=1000)
        self.failUnlessRaises(AssertionError, failure)

    def test_complex(self):
        x = np.random.randn(10) + 1j * np.random.randn(10)
        y = x + 1
        def failure():
            assert_array_almost_equal_nulp(x, y, nulp=1000)
        self.failUnlessRaises(AssertionError, failure)

    def test_complex2(self):
        x = np.random.randn(10)
        y = np.array(x, np.complex) + 1e-16 * np.random.randn(10)

        assert_array_almost_equal_nulp(x, y, nulp=1000)

class TestULP(unittest.TestCase):
    def test_equal(self):
        x = np.random.randn(10)
        assert_array_max_ulp(x, x, maxulp=0)

    def test_single(self):
        # Generate 1 + small deviation, check that adding eps gives a few UNL
        x = np.ones(10).astype(np.float32)
        x += 0.01 * np.random.randn(10).astype(np.float32)
        eps = np.finfo(np.float32).eps
        assert_array_max_ulp(x, x+eps, maxulp=20)

    def test_double(self):
        # Generate 1 + small deviation, check that adding eps gives a few UNL
        x = np.ones(10).astype(np.float32)
        x += 0.01 * np.random.randn(10).astype(np.float64)
        eps = np.finfo(np.float64).eps
        assert_array_max_ulp(x, x+eps, maxulp=200)

    def test_inf(self):
        for dt in [np.float32, np.float64]:
            inf = np.array([np.inf]).astype(dt)
            big = np.array([np.finfo(dt).max])
            assert_array_max_ulp(inf, big, maxulp=200)

    def test_nan(self):
        # Test that nan is 'far' from small, tiny, inf, max and min
        for dt in [np.float32, np.float64]:
            if dt == np.float32:
                maxulp = 1e6
            else:
                maxulp = 1e12
            inf = np.array([np.inf]).astype(dt)
            nan = np.array([np.nan]).astype(dt)
            big = np.array([np.finfo(dt).max])
            tiny = np.array([np.finfo(dt).tiny])
            zero = np.array([np.PZERO]).astype(dt)
            nzero = np.array([np.NZERO]).astype(dt)
            self.failUnlessRaises(AssertionError,
                                  lambda: assert_array_max_ulp(nan, inf,
                                                               maxulp=maxulp))
            self.failUnlessRaises(AssertionError,
                                  lambda: assert_array_max_ulp(nan, big,
                                                               maxulp=maxulp))
            self.failUnlessRaises(AssertionError,
                                  lambda: assert_array_max_ulp(nan, tiny,
                                                               maxulp=maxulp))
            self.failUnlessRaises(AssertionError,
                                  lambda: assert_array_max_ulp(nan, zero,
                                                               maxulp=maxulp))
            self.failUnlessRaises(AssertionError,
                                  lambda: assert_array_max_ulp(nan, nzero,
                                                               maxulp=maxulp))
if __name__ == '__main__':
    run_module_suite()

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