Meta/Dothem: support test-vars and use it in Doit

Doit

@@ -1,5 +1,5 @@
 #!/bin/sh
 
-Meta/Dothem --cocci --breaking --san --leaks --sha256 "$@"
+Meta/Dothem --cocci --breaking --test-vars --san --leaks --sha256 "$@"
 
 Meta/V

Dothem

@@ -27,7 +27,7 @@ inst_prefix=$(
 
 force= with_dash= test_long= M= install= doc= notest= bootstrap= branches= jobs=
 scratch= noprove= memtrash=--memtrash with_cocci= with_leaks= with_sha256= san= 
-clean= with_meson= breaking=
+clean= with_meson= breaking= test_vars=
 
 while	case "$1" in
 	--pedantic | --locale=* | --loose) M="$M $1" ;;
@@ -59,6 +59,7 @@ while	case "$1" in
 	--sha256) with_sha256=t ;;
 	--no-sha256) with_sha256= ;;
 	--meson) with_meson=t ;;
+	--test-vars) test_vars=test_vars ;;
 	-j*) jobs=$1 ;;
 	--) shift; break ;;
 	-*) echo >&2 "Unknown option: $1"; exit 1 ;;
@@ -307,6 +308,29 @@ do
 			did_test=did_test
 			GIT_TEST_DEFAULT_HASH=sha256 Meta/Make $jobs $T test
 		fi &&
+		if test -n "$test_vars"
+		then
+			section "test vars"
+			did_test=did_test
+			(
+				export OPENSSL_SHA1_UNSAFE=YesPlease
+				export GIT_TEST_SPLIT_INDEX=yes
+				export GIT_TEST_FULL_IN_PACK_ARRAY=true
+				export GIT_TEST_OE_SIZE=10
+				export GIT_TEST_OE_DELTA_SIZE=5
+				export GIT_TEST_COMMIT_GRAPH=1
+				export GIT_TEST_COMMIT_GRAPH_CHANGED_PATHS=1
+				export GIT_TEST_MULTI_PACK_INDEX=1
+				export GIT_TEST_MULTI_PACK_INDEX_WRITE_INCREMENTAL=1
+				export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master
+				export GIT_TEST_NO_WRITE_REV_INDEX=1
+				export GIT_TEST_CHECKOUT_WORKERS=2
+				export GIT_TEST_PACK_USE_BITMAP_BOUNDARY_TRAVERSAL=1
+				Meta/Make >/dev/null distclean &&
+				Meta/Make $jobs $T test &&
+				Meta/Make >/dev/null distclean
+			)
+		fi &&
 		if test -n "$breaking"
 		then
 			section breaking