'git diff-tree -r $tree_A $tree_B >.test-a &&
cmp -s .test-a .test-recursive-AB'
+test_expect_success \
+ 'diff-tree --stdin of known trees.' \
+ 'echo $tree_A $tree_B | git diff-tree --stdin > .test-a &&
+ echo $tree_A $tree_B > .test-plain-ABx &&
+ cat .test-plain-AB >> .test-plain-ABx &&
+ cmp -s .test-a .test-plain-ABx'
+
+test_expect_success \
+ 'diff-tree --stdin of known trees.' \
+ 'echo $tree_A $tree_B | git diff-tree -r --stdin > .test-a &&
+ echo $tree_A $tree_B > .test-recursive-ABx &&
+ cat .test-recursive-AB >> .test-recursive-ABx &&
+ cmp -s .test-a .test-recursive-ABx'
+
test_expect_success \
'diff-cache O with A in cache' \
'git read-tree $tree_A &&