runtests: make 'c-ares' a "feature" to depend on

... also added to the docs.

2 files changed, 2 insertions, 0 deletions

diff --git a/tests/FILEFORMAT.md b/tests/FILEFORMAT.md
index d0a6d3b21..ce4459a29 100644
--- a/tests/FILEFORMAT.md
+++ b/tests/FILEFORMAT.md
@@ -333,6 +333,7 @@ SKIPPED.
 Features testable here are:
 
 - `alt-svc`
+- `c-ares`
 - `cookies`
 - `crypto`
 - `debug`
diff --git a/tests/runtests.pl b/tests/runtests.pl
index fe48ee648..ac889a505 100755
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -2762,6 +2762,7 @@ sub compare {
 }
 
 sub setupfeatures {
+    $feature{"c-ares"} = $has_cares;
     $feature{"alt-svc"} = $has_altsvc;
     $feature{"HSTS"} = $has_hsts;
     $feature{"brotli"} = $has_brotli;