Test shape and dtype in test_matrix_power

Author: asmeurer

array_api_tests/test_linalg.py

@@ -301,6 +301,10 @@ def test_matrix_norm(x, kw):
 )
 def test_matrix_power(x, n):
     res = linalg.matrix_power(x, n)
+
+    assert res.shape == x.shape, "matrix_power() did not return the correct shape"
+    assert res.dtype == x.dtype, "matrix_power() did not return the correct dtype"
+
     if n == 0:
         true_val = lambda x: _array_module.eye(x.shape[0], dtype=x.dtype)
     else: