local mod = 1000000007
local mfl = math.floor

local function bmul(x, y)
  local x1, y1 = mfl(x / 31623), mfl(y / 31623)
  local x0, y0 = x - x1 * 31623, y - y1 * 31623
  return (x1 * y1 * 14122 + (x1 * y0 + x0 * y1) * 31623 + x0 * y0) % mod
end

local function badd(x, y)
  return (x + y) % mod
end
local q = io.read("*n")
for iq = 1, q do
  local n = io.read("*n")
  local a = io.read("*n")
  for i = 1, n - 1 do
    local b = io.read("*n")
    a = badd(a + b, bmul(a, b))
  end
  print(a)
end