Write a function to find the largest sum of contiguous array in the modified array which is formed by repeating the given array k times.
def max_sub_array_sum_repeated(a, n, k): 
	max_so_far = -2147483648
	max_ending_here = 0
	for i in range(n*k): 
		max_ending_here = max_ending_here + a[i%n] 
		if (max_so_far < max_ending_here): 
			max_so_far = max_ending_here 
		if (max_ending_here < 0): 
			max_ending_here = 0
	return max_so_far
<s>[INST]<<SYS>>Given a task and its code, generate test cases for the code.<</SYS>>Write a function to find the largest sum of contiguous array in the modified array which is formed by repeating the given array k times.
def max_sub_array_sum_repeated(a, n, k): 
	max_so_far = -2147483648
	max_ending_here = 0
	for i in range(n*k): 
		max_ending_here = max_ending_here + a[i%n] 
		if (max_so_far < max_ending_here): 
			max_so_far = max_ending_here 
		if (max_ending_here < 0): 
			max_ending_here = 0
	return max_so_far[/INST]assert max_sub_array_sum_repeated([10, 20, -30, -1], 4, 3) == 30
assert max_sub_array_sum_repeated([-1, 10, 20], 3, 2) == 59
assert max_sub_array_sum_repeated([-1, -2, -3], 3, 3) == -1</s>