TST: error tests for fill_diagonal()

* add error handling tests for previously
uncovered code in fill_diagonal()

1 files changed, 13 insertions, 0 deletions

diff --git a/numpy/lib/tests/test_index_tricks.py b/numpy/lib/tests/test_index_tricks.py
index 33b98629d..c6bcc0a86 100644
--- a/numpy/lib/tests/test_index_tricks.py
+++ b/numpy/lib/tests/test_index_tricks.py
@@ -336,6 +336,19 @@ class TestFillDiagonal(object):
         i = np.array([0, 1, 2])
         assert_equal(np.where(a != 0), (i, i, i, i))
 
+    def test_low_dim_handling(self):
+        # raise error with low dimensionality
+        a = np.zeros(3, int)
+        with assert_raises_regex(ValueError, "at least 2-d"):
+            fill_diagonal(a, 5)
+
+    def test_hetero_shape_handling(self):
+        # raise error with high dimensionality and
+        # shape mismatch
+        a = np.zeros((3,3,7,3), int)
+        with assert_raises_regex(ValueError, "equal length"):
+            fill_diagonal(a, 2)
+
 
 def test_diag_indices():
     di = diag_indices(4)