thinkr-open/golem-agent-skills/golem-run-tests

Run Tests

You are helping a user run tests for their golem Shiny application.

Running Tests

Run the following command to execute all tests:

Rscript -e "devtools::test()"

Testing Structure

Tests are organized in tests/testthat/:

• Test files mirror R/ files: test-<filename>.R
• Use test_that("description", { ... }) blocks
• Each test should be independent and hermetic

Test Best Practices

Hermetic Tests

• Each test_that() block should set up its own data inline
• Minimize top-level code outside test_that() blocks
• Tests should pass in any order and in isolation

Temporary State

• Use withr::local_*() for temporary changes:
• withr::local_options()
• withr::local_envvar()
• withr::local_dir()
• Use withr::local_tempfile() or withr::local_tempdir() for temporary files
• Never write directly to home or working directories

Test Data

• Store static test data in tests/testthat/fixtures/
• Load with readRDS(test_path("fixtures", "file.rds"))
• Keep fixtures organized and documented

Testing Reactive Code

• Test business logic outside of Shiny context when possible
• Use testServer() for testing Shiny modules
• Mock external dependencies when needed

Assertions

Use testthat functions:

• expect_true(), expect_false()
• expect_equal(), expect_identical()
• expect_error() with class = "error_class" parameter
• expect_warning(), expect_message()
• expect_silent()

Skipping Tests

For slow or network-dependent tests:

test_that("slow test", {
  skip_on_cran()
  # test code
})

Test Coverage

Aim for high code coverage:

• Run covr::report() to see coverage
• Test both happy path and error cases
• Test boundary conditions
• Test interaction between modules

Command Line Options

Run specific test files:

Rscript -e "devtools::test(filter = 'mod_name')"

Run tests with coverage:

Rscript -e "covr::report()"