Fix a test case

Need to find the packages root in `R CMD check` as well.

tests/testthat/helper.R

@@ -58,3 +58,21 @@ test_temp_dir <- function(pattern = "test-dir-", envir = parent.frame()) {
 }
 
 httpbin <- webfakes::new_app_process(webfakes::httpbin_app())
+
+test_package_root <- function() {
+  x <- tryCatch(
+    rprojroot::find_package_root_file(),
+    error = function(e) NULL)
+
+  if (!is.null(x)) return(x)
+
+  pkg <- testthat::testing_package()
+  x <- tryCatch(
+    rprojroot::find_package_root_file(
+      path = file.path("..", "..", "00_pkg_src", pkg)),
+    error = function(e) NULL)
+
+  if (!is.null(x)) return(x)
+
+  stop("Cannot find package root")
+}

tests/testthat/test-script.R

@@ -6,7 +6,7 @@ test_that("install-github.R script is up to date", {
   tmp <- test_temp_file(".R")
 
   withr::with_dir(
-    rprojroot::find_package_root_file(),
+    test_package_root(),
     brew::brew(file.path(root, "install-github.Rin"), tmp))
 
   expect_equal(