
library(testthat)

source("user_code.R")
test_that("creates a histogram of expression", {
  expect_silent(hist(sample_data$expression, main = "Histogram of Gene Expression", xlab = "Expression Level"))
})

test_that("creates a boxplot of expression by treatment", {
  expect_silent(boxplot(expression ~ treatment, data = sample_data, main = "Expression by Treatment", xlab = "Treatment", ylab = "Expression Level"))
})

test_that("creates a scatterplot of expression vs time", {
  expect_silent(plot(sample_data$time, sample_data$expression, main = "Expression Over Time", xlab = "Time (hours)", ylab = "Expression Level", pch = 19, col = "blue"))
})

test_that("histogram_conclusion is a non-empty string", {
  env <- new.env()
  sys.source("user_code.R", envir = env)
  expect_true(exists("histogram_conclusion", envir = env), info = "histogram_conclusion variable does not exist")
  val <- get("histogram_conclusion", envir = env)
  expect_type(val, "character")
  expect_true(nzchar(val), info = "histogram_conclusion is an empty string")
})

test_that("boxplot_conclusion is a non-empty string", {
  env <- new.env()
  sys.source("user_code.R", envir = env)
  expect_true(exists("boxplot_conclusion", envir = env), info = "boxplot_conclusion variable does not exist")
  val <- get("boxplot_conclusion", envir = env)
  expect_type(val, "character")
  expect_true(nzchar(val), info = "boxplot_conclusion is an empty string")
})

test_that("scatterplot_conclusion is a non-empty string", {
  env <- new.env()
  sys.source("user_code.R", envir = env)
  expect_true(exists("scatterplot_conclusion", envir = env), info = "scatterplot_conclusion variable does not exist")
  val <- get("scatterplot_conclusion", envir = env)
  expect_type(val, "character")
  expect_true(nzchar(val), info = "scatterplot_conclusion is an empty string")
})

test_main.R

A hands-on introduction to R programming tailored for biologists and bioinformaticians. Learn to analyze, visualize, and interpret biological data using R, with real-world examples from genomics, ecology, and experimental biology.

Learn the essentials of R programming with a focus on biological data, including variables, data types, and basic data manipulation.

Dive into statistical methods for analyzing biological data, including summary statistics, hypothesis testing, and interpreting results.

Master the art of visualizing biological data using R, from basic plots to more advanced visualizations relevant to experiments.

Learn to work with genomic-style data and develop reproducible workflows for scientific research in R.

Challenge: Visualizing Experimental Data

Solution

Challenge: Visualizing Experimental Data

Solution