fixup! Add test for accumulate issue

Author: vchuravy

test/test.jl

@@ -399,9 +399,9 @@ function unittest_testsuite(Backend, backend_str, backend_mod, BackendArrayT; sk
         input = Float32[i + k for i in 1:M, k in 1:N]
 
         reference = zeros(Float32, M, N)
-        for i in 1:m
-            for j in 1:n
-                for k in j:n
+        for i in 1:M
+            for j in 1:N
+                for k in j:N
                     reference[i, j] += input[i, k]
                 end
             end