Merge branch 'tc/t0450-harden' into seen

Test updates.

* tc/t0450-harden:
  fixup! t0450: add allowlist for builtins with missing .adoc
  t0450: add allowlist for builtins with missing .adoc
  t0450: fix test for out-of-tree builds

Author: gitster

t/t0450-txt-doc-vs-help.sh

@@ -41,7 +41,7 @@ help_to_synopsis () {
 }
 
 builtin_to_adoc () {
-       echo "$GIT_BUILD_DIR/Documentation/git-$1.adoc"
+       echo "$GIT_SOURCE_DIR/Documentation/git-$1.adoc"
 }
 
 adoc_to_synopsis () {
@@ -112,10 +112,19 @@ do
 	adoc="$(builtin_to_adoc "$builtin")" &&
 	preq="$(echo BUILTIN_ADOC_$builtin | tr '[:lower:]-' '[:upper:]_')" &&
 
-	if test -f "$adoc"
+	# If and only if *.adoc is missing, builtin shall be listed in t0450/adoc-missing.
+	if grep -q "^$builtin$" "$TEST_DIRECTORY"/t0450/adoc-missing
 	then
+		test_expect_success "$builtin appropriately marked as not having .adoc" '
+			! test -f "$adoc"
+		'
+	else
 		test_set_prereq "$preq"
-	fi &&
+
+		test_expect_success "$builtin appropriately marked as having .adoc" '
+			test -f "$adoc"
+		'
+	fi
 
 	# *.adoc output assertions
 	test_expect_success "$preq" "$builtin *.adoc SYNOPSIS has dashed labels" '

t/t0450/adoc-missing

@@ -0,0 +1,9 @@
+checkout--worker
+merge-ours
+merge-recursive
+merge-recursive-ours
+merge-recursive-theirs
+merge-subtree
+pickaxe
+submodule--helper
+upload-archive--writer