def test_vector1_empty(self):
vector1 = {}
vector2 = {1: 3}
self.assertEqual(sparse_add(vector1, vector2), vector2)
def test_vectors_with_positive_values(self):
vector1 = {1: 1, 2: 3}
vector2 = {1: 2, 2: 1}
result = {1: 3, 2: 4}
self.assertEqual(sparse_add(vector1, vector2), result)
def test_vectors_with_different_length(self):
vector1 = {1: 3}
vector2 = {1: 2, 3: 4}
result = {}
self.assertEqual(sparse_add(vector1, vector2), result)
def test_vector_sum_equals_zero(self):
vector1 = {1: -1, 2: 1}
vector2 = {1: 1, 2: 1}
result = {2: 2}
self.assertEqual(sparse_add(vector1, vector2), result)
def test_both_vector_empty(self):
vector1 = {}
vector2 = {}
result = {}
self.assertEqual(sparse_add(vector1, vector2), result)