1 file changed, 14 insertions, 12 deletions
diff --git a/tests/t0002-html-validity.sh b/tests/t0002-html-validity.sh
index bdccaf2..a4a6725 100755
--- a/tests/t0002-html-validity.sh
+++ b/tests/t0002-html-validity.sh
@@ -17,22 +17,24 @@ test_url() {
 	strip_headers <tidy-$test_count.tmp >tidy-$test_count || return
 	# Tidy leaves with 1 for warnings and 2 for errors, and only an error is
 	# worth failing the test over.
-	"$tidy" -eq tidy-$test_count
+	tidy -eq tidy-$test_count
 	test $? != 2
 }
 
-tidy=$(command -v tidy) || {
-	skip_all='Skipping html validation tests: tidy not found'
-	test_done
-}
-
 # Releases of tidy that predate HTML5 reject the semantic elements cgit emits,
-# header, nav, main and footer among them, reporting each as an error. Skip the
-# validation unless tidy is new enough to understand them.
-printf '<!DOCTYPE html>\n<html lang="en"><head><title>t</title></head><body><header>x</header></body></html>\n' \
-	| "$tidy" -q -e >/dev/null 2>&1
-test $? -ge 2 && {
-	skip_all='Skipping html validation tests: tidy is too old for HTML5'
+# header, nav, main and footer among them, reporting each as an error, so only
+# a tidy new enough to understand them will do.
+test_lazy_prereq TIDY '
+	cat >probe.html <<-\EOF &&
+	<!DOCTYPE html>
+	<html lang="en"><head><title>t</title></head><body><header>x</header></body></html>
+	EOF
+	tidy -q -e probe.html >/dev/null 2>&1
+	test $? -lt 2
+'
+
+test_have_prereq TIDY || {
+	skip_all='Skipping html validation tests: no tidy that knows HTML5'
 	test_done
 }