In this context, HTTP requests attempt to load API response fixtures from
files. This allows test code to proceed evaluating code that expects
HTTP requests to return meaningful responses. Requests that do not have a
corresponding fixture file raise errors, like how without_internet()
does.
with_mock_api(expr)
use_mock_api()
stop_mocking()Code to run inside the mock context
with_mock_api() returns the result of expr. use_mock_api() and
stop_mocking() return nothing.
use_mock_api() and stop_mocking() allow you to turn on/off request
mocking for more convenient use in an interactive session.
Requests are translated to mock file paths according to several rules that
incorporate the request method, URL, query parameters, and body. See
build_mock_url() for details.
File paths for API fixture files may be relative to the 'tests/testthat'
directory, i.e. relative to the .R test files themselves. This is the default
location for storing and retrieving mocks, but you can put them anywhere you
want as long as you set the appropriate location with .mockPaths().
library(httr2)
with_mock_api({
# There are no mocks recorded in this example, so catch this request with
# expect_GET()
expect_GET(
request("https://cran.r-project.org") %>% req_perform(),
"https://cran.r-project.org"
)
# For examples with mocks, see the tests and vignettes
})
#> <error/httptest2_request>
#> Error in `stop_request()`:
#> ! An unexpected request was made:
#> GET https://cran.r-project.org
#> Expected mock file: cran.r-project.org.*
#> ---
#> Backtrace:
#> ▆
#> 1. ├─pkgdown::deploy_to_branch(new_process = FALSE)
#> 2. │ └─pkgdown::build_site_github_pages(pkg, ..., clean = clean)
#> 3. │ └─pkgdown::build_site(...)
#> 4. │ └─pkgdown:::build_site_local(...)
#> 5. │ └─pkgdown::build_reference(...)
#> 6. │ └─purrr::map(...)
#> 7. │ └─purrr:::map_("list", .x, .f, ..., .progress = .progress)
#> 8. │ ├─purrr:::with_indexed_errors(...)
#> 9. │ │ └─base::withCallingHandlers(...)
#> 10. │ ├─purrr:::call_with_cleanup(...)
#> 11. │ └─pkgdown (local) .f(.x[[i]], ...)
#> 12. │ ├─base::withCallingHandlers(...)
#> 13. │ └─pkgdown:::data_reference_topic(...)
#> 14. │ └─pkgdown:::run_examples(...)
#> 15. │ └─pkgdown:::highlight_examples(code, topic, env = env)
#> 16. │ └─downlit::evaluate_and_highlight(...)
#> 17. │ └─evaluate::evaluate(code, child_env(env), new_device = TRUE, output_handler = output_handler)
#> 18. │ └─evaluate:::evaluate_call(...)
#> 19. │ ├─evaluate (local) timing_fn(...)
#> 20. │ ├─evaluate (local) handle(...)
#> 21. │ │ └─base::try(f, silent = TRUE)
#> 22. │ │ └─base::tryCatch(...)
#> 23. │ │ └─base (local) tryCatchList(expr, classes, parentenv, handlers)
#> 24. │ │ └─base (local) tryCatchOne(expr, names, parentenv, handlers[[1L]])
#> 25. │ │ └─base (local) doTryCatch(return(expr), name, parentenv, handler)
#> 26. │ ├─base::withCallingHandlers(...)
#> 27. │ ├─base::withVisible(...)
#> 28. │ └─evaluate:::eval_with_user_handlers(expr, envir, enclos, user_handlers)
#> 29. │ └─base::eval(expr, envir, enclos)
#> 30. │ └─base::eval(expr, envir, enclos)
#> 31. │ ├─httptest2::with_mock_api(...)
#> 32. │ │ └─base::eval.parent(expr)
#> 33. │ │ └─base::eval(expr, p)
#> 34. │ ├─httptest2::expect_GET(...)
#> 35. │ │ └─httptest2:::expect_request(object, "GET ", url, " ", ...)
#> 36. │ │ ├─base::withCallingHandlers(...)
#> 37. │ │ └─testthat::expect_error(...)
#> 38. │ │ └─testthat:::quasi_capture(...)
#> 39. │ │ ├─testthat (local) .capture(...)
#> 40. │ │ │ └─base::withCallingHandlers(...)
#> 41. │ │ └─rlang::eval_bare(quo_get_expr(.quo), quo_get_env(.quo))
#> 42. │ └─request("https://cran.r-project.org") %>% req_perform()
#> 43. └─httr2::req_perform(.)
#> 44. └─httptest2 (local) mock(req)
#> 45. └─httptest2:::stop_request(req)