def test_a_3x3_matrix_ought_to_be_representable():
# Given
M = Matrix(-3, 5, 0,
1, -2, -7,
0, 1, 1)
# Then
assert M.at(0, 0) == -3
assert M.at(1, 1) == -2
assert M.at(2, 2) == 1
def test_a_2x2_matrix_ought_to_be_representable():
# Given
M = Matrix(-3, 5,
1, -2)
# Then
assert M.at(0, 0) == -3
assert M.at(0, 1) == 5
assert M.at(1, 0) == 1
assert M.at(1, 1) == -2
def test_constructing_and_inspecting_a_4x4_matrix():
# Given
M = Matrix(1, 2, 3, 4,
5.5, 6.5, 7.5, 8.5,
9, 10, 11, 12,
13.5, 14.5, 15.5, 16.5)
# Then
assert M.at(0, 0) == 1
assert M.at(0, 3) == 4
assert M.at(1, 0) == 5.5
assert M.at(1, 2) == 7.5
assert M.at(2, 2) == 11
assert M.at(3, 0) == 13.5
assert M.at(3, 2) == 15.5
