test_that("input parameter mismatches cause failures", {
  x <- c(1, 2)
  y <- c(1, 2)
  expect_error(sparsegl(x, y))

  x <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
  y <- c(1, 2)
  expect_error(sparsegl(x, y), NA)

  x <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
  x[1, 1] <- NA
  y <- c(1, 2)
  expect_error(sparsegl(x, y))

  i <- c(1, 3:8)
  j <- c(2, 9, 6:10)
  x <- 7 * (1:7)
  A <- Matrix::sparseMatrix(i, j, x = x)
  y <- c(1, 2)
  expect_error(sparsegl(A, y))

  x <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
  y <- c("1", "2")
  expect_error(sparsegl(x, y))

  i <- c(1, 3:8)
  j <- c(2, 9, 6:10)
  x <- 7 * (1:7)
  A <- Matrix::sparseMatrix(i, j, x = x)
  y <- c(1:8)
  expect_error(sparsegl(A, y), NA)


  x <- matrix(c(1, 2, 3, 4, 5, 6), nrow = 2)
  y <- c(1, 2)
  expect_error(sparsegl(x, y, group = c(1, 2)))
  expect_error(sparsegl(x, y, group = c(1, 2, 4)))
  expect_error(sparsegl(x, y, group = c(2, 3, 4)))
  expect_error(sparsegl(x, y, group = c(1, 2, 3), asparse = 1.1))
  expect_warning(sparsegl(x, y, group = c(1, 2, 3), asparse = -1))
  expect_error(sparsegl(x, y, pf_group = c(1, 2)))
  expect_error(sparsegl(x, y, lambda.factor = 2))
  expect_error(sparsegl(x, y, lambda = c(-1, 1)))
  expect_error(sparsegl(x, y, lower_bnd = c(-1, -5, 2)))
  expect_error(sparsegl(x, y, upper_bnd = c(-1, -5, 2)))
  expect_error(sparsegl(x, y, lower_bnd = c(-1, -5)))
  expect_error(sparsegl(x, y, upper_bnd = c(1, 5)))
})