def test_creating_3_by_3_matrix(self):
data = [[-3, 5, 0], [1, -2, -7], [0, 1, 1]]
matrix = Matrix(data)
assert matrix.at(0, 0) == -3
assert matrix.at(1, 1) == -2
assert matrix.at(2, 1) == 1
def test_creating_2_by_2_matrix(self):
data = [[-3, 5], [1, -2]]
matrix = Matrix(data)
assert matrix.at(0, 0) == -3
assert matrix.at(0, 1) == 5
assert matrix.at(1, 0) == 1
assert matrix.at(1, 1) == -2
def test_initialization(self):
data = [
[1, 2, 3, 4],
[5.5, 6.5, 7.5, 8.5],
[9, 10, 11, 12],
[13.5, 14.5, 15.5, 16.5],
]
matrix = Matrix(data)
assert matrix.at(0, 0) == 1
assert matrix.at(0, 3) == 4
assert matrix.at(1, 0) == 5.5
assert matrix.at(1, 2) == 7.5
assert matrix.at(2, 2) == 11
assert matrix.at(3, 0) == 13.5
assert matrix.at(3, 2) == 15.5
