test "$(git-merge-base modD D)" = "$(git-rev-parse B)"
'
+test_expect_success 'filter subdirectory only' '
+ mkdir subdir &&
+ touch subdir/new &&
+ git add subdir/new &&
+ test_tick &&
+ git commit -m "subdir" &&
+ echo H > a &&
+ test_tick &&
+ git commit -m "not subdir" a &&
+ echo A > subdir/new &&
+ test_tick &&
+ git commit -m "again subdir" subdir/new &&
+ git rm a &&
+ test_tick &&
+ git commit -m "again not subdir" &&
+ git-filter-branch --subdirectory-filter subdir sub
+'
+
+test_expect_success 'subdirectory filter result looks okay' '
+ test 2 = $(git-rev-list sub | wc -l) &&
+ git show sub:new &&
+ ! git show sub:subdir
+'
+
+test_expect_success 'setup and filter history that requires --full-history' '
+ git checkout master &&
+ mkdir subdir &&
+ echo A > subdir/new &&
+ git add subdir/new &&
+ test_tick &&
+ git commit -m "subdir on master" subdir/new &&
+ git rm a &&
+ test_tick &&
+ git commit -m "again subdir on master" &&
+ git merge branch &&
+ git-filter-branch --subdirectory-filter subdir sub-master
+'
+
+test_expect_success 'subdirectory filter result looks okay' '
+ test 3 = $(git-rev-list -1 --parents sub-master | wc -w) &&
+ git show sub-master^:new &&
+ git show sub-master^2:new &&
+ ! git show sub:subdir
+'
+
+test_expect_success 'use index-filter to move into a subdirectory' '
+ git-filter-branch --index-filter \
+ "git-ls-files -s | sed \"s-\\t-&newsubdir/-\" |
+ GIT_INDEX_FILE=\$GIT_INDEX_FILE.new \
+ git-update-index --index-info &&
+ mv \$GIT_INDEX_FILE.new \$GIT_INDEX_FILE" directorymoved &&
+ test -z "$(git diff HEAD directorymoved:newsubdir)"'
+
test_done