skip patch test if NumPy fft has been replaced by a module already

Author: ndgrigorian

mkl_fft/tests/test_patch.py

@@ -23,12 +23,18 @@
 # OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+import pytest
+
 import numpy as np
 
 import mkl_fft
 import mkl_fft.interfaces.numpy_fft as _nfft
 
 
+@pytest.mark.skipif(
+        np.fft.fft.__module__ != "numpy.fft",
+        reason="NumPy is already patched by a different library"
+)
 def test_patch():
     mkl_fft.restore_numpy_fft()
     assert not mkl_fft.is_patched()