fix syntax

Author: wrightky

tests/test_particle_track.py

@@ -488,7 +488,7 @@ def test_nourishment_area_sigma():
     vf = particle_track.nourishment_area(walk_data, (3,3),
                                          sigma=0.5, clip=100)
     vf[np.isnan(vf)] = 0
-    assert (pytest.approx(vf, 0.001) == answer)
+    assert pytest.approx(vf == answer, 0.001)
 
 def test_nourishment_time():
     walk_data = dict()
@@ -515,7 +515,7 @@ def test_nourishment_time_sigma():
     nt = particle_track.nourishment_time(walk_data, (6, 6),
                                          sigma=0.5, clip=100)
     nt[np.isnan(nt)] = 0
-    assert (pytest.approx(nt, 0.001) == answer)
+    assert pytest.approx(nt == answer, 0.001)
 
 def test_unstruct2grid_k1():
     coords = [(10.5, 10.1),