ENH: Make the window functions exactly symmetric

This relies on the fact that `cos` is exactly symmetric around zero, but not around the floating-point approximation of `pi`.

Closes gh-17169.

1 files changed, 4 insertions, 4 deletions

diff --git a/numpy/lib/tests/test_function_base.py b/numpy/lib/tests/test_function_base.py
index 41afccacc..7bddb941c 100644
--- a/numpy/lib/tests/test_function_base.py
+++ b/numpy/lib/tests/test_function_base.py
@@ -1805,28 +1805,28 @@ class TestFilterwindows:
     def test_hanning(self):
         # check symmetry
         w = hanning(10)
-        assert_array_almost_equal(w, flipud(w), 7)
+        assert_equal(w, flipud(w))
         # check known value
         assert_almost_equal(np.sum(w, axis=0), 4.500, 4)
 
     def test_hamming(self):
         # check symmetry
         w = hamming(10)
-        assert_array_almost_equal(w, flipud(w), 7)
+        assert_equal(w, flipud(w))
         # check known value
         assert_almost_equal(np.sum(w, axis=0), 4.9400, 4)
 
     def test_bartlett(self):
         # check symmetry
         w = bartlett(10)
-        assert_array_almost_equal(w, flipud(w), 7)
+        assert_equal(w, flipud(w))
         # check known value
         assert_almost_equal(np.sum(w, axis=0), 4.4444, 4)
 
     def test_blackman(self):
         # check symmetry
         w = blackman(10)
-        assert_array_almost_equal(w, flipud(w), 7)
+        assert_equal(w, flipud(w))
         # check known value
         assert_almost_equal(np.sum(w, axis=0), 3.7800, 4)