test.rb

# Метод, который хотим тестировать
def det(matrix)
  # fake implementation
  0
end


def do_det_test(test_case)
  result = det(test_case[:data])
  assert_equal(result, test_case[:expected])
end

def test_det
  cases = [
    {data: MATRIX_2, expected: -6},
    {data: MATRIX_3, expected: 946},
    {data: Data::LU_A, expected: 1867}
  ]
  cases.each { |test_case| do_det_test test_case }
end

# Хочется вместо 2х методов писать так:
test_method(det, [
    {args: MATRIX_2, expected: -6},
    {args: MATRIX_3, expected: 946},
    {args: Data::LU_A, expected: 1867}
  ])
  
# Еще пример:
def f(a, b)
  a + b
end

test_method(f,[
  {args: [1, 2], expected: 3},
  {args: [-1, 2], expected: 1},
  {args: [0, 0], expected: 0},
  {args: [0, 2], expected: 2},
])

# Или:
test_method(f,[
  [[1, 2], 3],
  [[-1, 2], 1],
  [[0, 0], 0],
  [[0, 2], 2]
])