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Teach test_active_file() about snapshot files #2666

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Teach test_active_file() about snapshot files #2666

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Teach `test_active_file()` about snapshot files
hadley Feb 2, 2026
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hadley Feb 3, 2026
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3 changes: 3 additions & 0 deletions R/active.R
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Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,7 @@ find_test_file <- function(path, call = parent.frame()) {

test_file_type <- function(path) {
dir <- path_file(path_dir(path))
parent_dir <- path_file(path_dir(path_dir(path)))
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Copilot AI Feb 3, 2026

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The variable name parent_dir is misleading. This variable contains the name of the parent directory (e.g., '_snaps'), not the parent directory path itself. Consider renaming it to parent_dir_name or grandparent_dir_name to clarify that it represents the directory name, not the path.

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name <- path_file(path)
ext <- tolower(path_ext(path))

Expand All @@ -46,6 +47,8 @@ test_file_type <- function(path) {
type[dir == "R" & ext == "r"] <- "R"
type[dir == "testthat" & ext == "r" & grepl("^test", name)] <- "test"
type[dir == "src" & ext %in% src_ext] <- "src"
type[dir == "_snaps" & ext == "md"] <- "snap"
type[parent_dir == "_snaps" & ext == "md"] <- "snap"
type
}

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27 changes: 27 additions & 0 deletions tests/testthat/test-active.R
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Expand Up @@ -12,6 +12,29 @@ test_that("fails if can't find tests", {
})
})

test_that("find_test_file() works with snapshot files", {
dir <- local_package_create()
withr::local_dir(dir)
dir_create("tests/testthat/_snaps")
file_create("tests/testthat/test-foo.R")
file_create("tests/testthat/_snaps/foo.md")

path <- find_test_file("tests/testthat/_snaps/foo.md")
expect_equal(path_file(path), "test-foo.R")
})

test_that("find_test_file() works with snapshot variant files", {
dir <- local_package_create()

withr::local_dir(dir)
dir_create("tests/testthat/_snaps/variant")
file_create("tests/testthat/test-foo.R")
file_create("tests/testthat/_snaps/variant/foo.md")

path <- find_test_file("tests/testthat/_snaps/variant/foo.md")
expect_equal(path_file(path), "test-foo.R")
})

test_that("can determine file type", {
expect_equal(test_file_type("R/foo.R"), "R")
expect_equal(test_file_type("R/foo.c"), NA_character_)
Expand All @@ -23,5 +46,9 @@ test_that("can determine file type", {
expect_equal(test_file_type("tests/testthat/test-foo.c"), NA_character_)
expect_equal(test_file_type("tests/testthat/foo.R"), NA_character_)

expect_equal(test_file_type("tests/testthat/_snaps/foo.md"), "snap")
expect_equal(test_file_type("tests/testthat/_snaps/variant/foo.md"), "snap")
expect_equal(test_file_type("tests/testthat/_snaps/foo.R"), NA_character_)

expect_equal(test_file_type("DESCRIPTION"), NA_character_)
})
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