test_that("output checks out", {
  temp <- c(2, 5, 8, 11, 14)
  days <- c(194, 87, 54, 35, 28)
  m <- fit_model(temp, days, "sockeye", "hatch")
  expect_type(m, "list")
  expect_length(m, 8)
  expect_type(m$model, "list")
  expect_s3_class(m$model, "nls")
  expect_s3_class(m$expression, "data.frame")
  expect_type(m$expression$expression, "character")
  expect_type(m$log_a, "double")
  expect_type(m$b, "double")
  expect_type(m$r_squared, "double")
  expect_type(m$mse, "double")
  expect_type(m$rmse, "double")
  expect_s3_class(m$pred_plot, "gg")
  expect_invisible(plot(m$pred_plot))
})

test_that("errors work", {
  temp <- c(2, 5, 8, 11, 14)
  days <- c(194, 87, 54, 35, 28)
  expect_error(fit_model(temp, days, development_type = "hatch"))
  expect_error(fit_model(temp, days, species = "sockeye"))

})