Update unit test

test/gw/detector/interferometer_test.py

@@ -562,7 +562,7 @@ class TestInterferometerWhitenedStrain(unittest.TestCase):
     def setUp(self):
         self.ifo = bilby.gw.detector.get_empty_interferometer('H1')
         self.ifo.set_strain_data_from_power_spectral_density(
-            sampling_frequency=4096, duration=4)
+            sampling_frequency=4096, duration=64)
 
     def tearDown(self):
         del self.ifo
@@ -570,8 +570,10 @@ class TestInterferometerWhitenedStrain(unittest.TestCase):
     def test_whitened_strain(self):
         mask = self.ifo.frequency_mask
         white = self.ifo.whitened_frequency_domain_strain[mask]
-        std = np.std(white)
-        self.assertAlmostEqual(std, 1, places=2)
+        std_real = np.std(white.real)
+        std_imag = np.std(white.imag)
+        self.assertAlmostEqual(std_real, 1, places=2)
+        self.assertAlmostEqual(std_imag, 1, places=2)
 
 
 if __name__ == "__main__":