
library(testthat)

source("user_code.R")
test_that("perform_t_test returns correct structure and types", {
  result <- perform_t_test(c(1, 2, 3), c(4, 5, 6))
  expect_true(is.list(result), info = "Result should be a list.")
  expect_true("p_value" %in% names(result), info = "List should contain 'p_value'.")
  expect_true("significant" %in% names(result), info = "List should contain 'significant'.")
  expect_true(is.numeric(result$p_value), info = "'p_value' should be numeric.")
  expect_true(is.logical(result$significant), info = "'significant' should be logical.")
})

test_that("perform_chi_squared_test returns correct structure and types", {
  result <- perform_chi_squared_test(c(10, 20, 30), c(12, 18, 30))
  expect_true(is.list(result), info = "Result should be a list.")
  expect_true("p_value" %in% names(result), info = "List should contain 'p_value'.")
  expect_true("significant" %in% names(result), info = "List should contain 'significant'.")
  expect_true(is.numeric(result$p_value), info = "'p_value' should be numeric.")
  expect_true(is.logical(result$significant), info = "'significant' should be logical.")
})

test_that("t-test detects significant difference when means differ", {
  group1 <- c(2, 2, 2, 2, 2)
  group2 <- c(10, 10, 10, 10, 10)
  result <- perform_t_test(group1, group2)
  expect_true(result$significant, info = "Should be significant when means are far apart.")
})

test_that("t-test detects non-significance when means are similar", {
  group1 <- c(5, 5, 5, 5, 5)
  group2 <- c(5.1, 5, 5, 5, 5)
  result <- perform_t_test(group1, group2)
  expect_false(result$significant, info = "Should not be significant when means are very close.")
})

test_that("chi-squared test detects significance for large frequency differences", {
  observed <- c(100, 10, 10)
  expected <- c(40, 40, 40)
  result <- perform_chi_squared_test(observed, expected)
  expect_true(result$significant, info = "Should be significant for large differences in frequencies.")
})

test_that("chi-squared test detects non-significance for similar frequencies", {
  observed <- c(10, 20, 30)
  expected <- c(10, 20, 30)
  result <- perform_chi_squared_test(observed, expected)
  expect_false(result$significant, info = "Should not be significant when observed and expected are equal.")
})

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: Hypothesis Testing with Biological Data

Solution

Challenge: Hypothesis Testing with Biological Data

Solution