[tests] test15_vec_ref : test both col/row major

[tests] test15_vec_ref : test different row step sizes

tests/test_eigen.py

@@ -378,11 +378,15 @@ def test14_single_element():
 
 @needs_numpy_and_eigen
 @pytest.mark.parametrize(("n1", "n2"), [(4, 2), (6, 3), (8, 2)])
-def test15_vec_ref(n1, n2):
-    np.set_printoptions(precision=4, linewidth=200)
+@pytest.mark.parametrize("rowStep", (1, 2))
+@pytest.mark.parametrize("col_major", (False, True))
+def test15_vec_ref(n1, n2, rowStep, colMajor):
+    np.set_printoptions(precision=5, linewidth=200)
     np.random.seed(42)
     a = np.random.randn(n1, 8)
-    a = np.asfortranarray(a)  # column-major
+    if colMajor:
+        a = np.asfortranarray(a)  # column-major
+    a = a[::rowStep, :]
     s1 = a[:n2]
     s2 = a[n2:]
     print("INPUT VALUES AND STRIDES:")