diff --git a/lib/matplotlib/tests/test_mlab.py b/lib/matplotlib/tests/test_mlab.py
index ef36eaf0b702..9ea18d67c281 100644
--- a/lib/matplotlib/tests/test_mlab.py
+++ b/lib/matplotlib/tests/test_mlab.py
@@ -2136,6 +2136,20 @@ def test_psd_windowarray_equal(self):
assert_allclose(speca, specb, atol=1e-08)
+# extra test for cohere...
+def test_cohere():
+ N = 1024
+ np.random.seed(19680801)
+ x = np.random.randn(N)
+ # phase offset
+ y = np.roll(x, 20)
+ # high-freq roll-off
+ y = np.convolve(y, np.ones(20) / 20., mode='same')
+ cohsq, f = mlab.cohere(x, y, NFFT=256, Fs=2, noverlap=128)
+ assert_allclose(np.mean(cohsq), 0.837, atol=1.e-3)
+ assert np.isreal(np.mean(cohsq))
+
+
def test_griddata_linear():
# z is a linear function of x and y.
def get_z(x, y):
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