fix tests for unitvector computations

tests/math/test_ntrfc_vectorcalc.py

 import numpy as np
 
-from ntrfc.math.vectorcalc import unitvec_list
-
 
 def test_absVec():
     import numpy as np
@@ -90,15 +88,20 @@ def test_vecAbs_list():
 
 
 def test_unitvec_list():
+    from ntrfc.math.vectorcalc import unitvec_list
     a = np.array([1,0,0])
     b = np.array([0,0,9])
     c = np.stack([a,b])
     directions = unitvec_list(c)
-    assert directions[0] == np.array([1,0,0])
-    assert directions[1] == np.array([0,0,1])
+    assert all(np.equal(directions[0],np.array([1,0,0])))
+    assert all(np.equal(directions[1],np.array([0,0,1])))
 
 
 def test_unitvec():
+    from ntrfc.math.vectorcalc import unitvec
     a = np.array([9,0,0])
     am = unitvec(a)
+    assert all(np.equal(am,np.array([1,0,0])))
     b = np.array([0,0,-9])
+    bm = unitvec(b)
+    assert all(np.equal(bm,np.array([0,0,-1])))