tests/testthat/test-linear-model.r

In BillyTian/bis557: Package containing assignments, projects or other products in BIS557

library(testthat)

context("Test the output of homework 1: linear_model().")

test_that("You linear_model() function works in an easy case.", {

  data(iris)

  fit_linear_model <- linear_model(Sepal.Length ~ ., iris)

  fit_lm <- lm(Sepal.Length  ~ ., iris)

  expect_equivalent(fit_lm$coefficients, fit_linear_model$coefficients,
                    tolerance = 1e-5)
})

test_that("You linear_model() function works with contrasts.", {

  data(iris)

  fit_linear_model <- linear_model(Sepal.Length ~ ., iris,
                                   contrasts = list(Species = "contr.sum"))

  fit_lm <- lm(Sepal.Length  ~ ., iris, contrasts = list(Species = "contr.sum"))

  expect_equivalent(fit_lm$coefficients, fit_linear_model$coefficients,
                    tolerance = 1e-5)
})

test_that("Your linear_model() function works in a tougher case.", {

  data(lm_patho)

  fit_linear_model <- linear_model(y ~., lm_patho)

  fit_lm <- lm(y ~., lm_patho)

  expect_equivalent(fit_lm$coefficients, fit_linear_model$coefficients,
                    tolerance = 1e-5)
})