Remove signbit testing from exp test

Author: ndgrigorian

dpctl/tests/elementwise/test_exp.py

@@ -2,7 +2,7 @@
 
 import numpy as np
 import pytest
-from numpy.testing import assert_allclose, assert_array_equal
+from numpy.testing import assert_allclose
 
 import dpctl.tensor as dpt
 from dpctl.tests.helper import get_queue_or_skip, skip_if_dtype_not_supported
@@ -137,14 +137,13 @@ def test_exp_real_special_cases(dtype):
     skip_if_dtype_not_supported(dtype, q)
 
     tol = 8 * dpt.finfo(dtype).resolution
-    x = [np.nan, -np.nan, np.inf, -np.inf, -1.0, 1.0, 0.0, -0.0]
+    x = [np.nan, np.inf, -np.inf, -1.0, 1.0, 0.0, -0.0]
     Xnp = np.array(x, dtype=dtype)
     X = dpt.asarray(x, dtype=dtype)
 
     Y = dpt.asnumpy(dpt.exp(X))
     Ynp = np.exp(Xnp)
     assert_allclose(Y, Ynp, atol=tol, rtol=tol)
-    assert_array_equal(np.signbit(Y), np.signbit(Ynp))
 
 
 @pytest.mark.parametrize("dtype", ["f2", "f4", "f8"])