options for strict tests; few enhancements (#52)

- part of
insightsengineering/coredev-tasks#478
- please read this for more info about the implementation:
insightsengineering/coredev-tasks#478 (comment)

---------

Co-authored-by: 27856297+dependabot-preview[bot]@users.noreply.github.com <27856297+dependabot-preview[bot]@users.noreply.github.com>

DESCRIPTION

@@ -39,7 +39,8 @@ Suggests:
     knitr,
     rmarkdown,
     testthat (>= 3.1),
-    vdiffr
+    vdiffr,
+    withr (>= 2.0.0)
 VignetteBuilder:
     knitr
 Config/testthat/edition: 3

tests/testthat/setup-options.R

@@ -0,0 +1,20 @@
+# `opts_partial_match_old` is left for exclusions due to partial matching in dependent packages (i.e. not fixable here)
+# it might happen that it is not used right now, but it is left for possible future use
+# use with: `withr::with_options(opts_partial_match_old, { ... })` inside the test
+opts_partial_match_old <- list(
+  warnPartialMatchDollar = getOption("warnPartialMatchDollar"),
+  warnPartialMatchArgs = getOption("warnPartialMatchArgs"),
+  warnPartialMatchAttr = getOption("warnPartialMatchAttr")
+)
+opts_partial_match_new <- list(
+  warnPartialMatchDollar = TRUE,
+  warnPartialMatchArgs = TRUE,
+  warnPartialMatchAttr = TRUE
+)
+
+if (isFALSE(getFromNamespace("on_cran", "testthat")()) && requireNamespace("withr", quietly = TRUE)) {
+  withr::local_options(
+    opts_partial_match_new,
+    .local_envir = testthat::teardown_env()
+  )
+}