t1010: add mktree test

So far mktree (which has always been a quick hack) had no test.
At least give it a bit of test coverage.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t1010-mktree.sh b/t/t1010-mktree.sh
new file mode 100755 (executable)
index 0000000..4d9b138
--- /dev/null
+++ b/t/t1010-mktree.sh
@@ -0,0 +1,61 @@
+#!/bin/sh
+
+test_description='git mktree'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+       for d in a a. a0
+       do
+               mkdir "$d" && echo "$d/one" >"$d/one" &&
+               git add "$d"
+       done &&
+       echo one >one &&
+       git add one &&
+       git write-tree >tree &&
+       git ls-tree $(cat tree) >top &&
+       git ls-tree -r $(cat tree) >all &&
+       test_tick &&
+       git commit -q -m one &&
+       H=$(git rev-parse HEAD) &&
+       git update-index --add --cacheinfo 160000 $H sub &&
+       test_tick &&
+       git commit -q -m two &&
+       git rev-parse HEAD^{tree} >tree.withsub &&
+       git ls-tree HEAD >top.withsub &&
+       git ls-tree -r HEAD >all.withsub
+'
+
+test_expect_success 'ls-tree piped to mktree (1)' '
+       git mktree <top >actual &&
+       test_cmp tree actual
+'
+
+test_expect_success 'ls-tree piped to mktree (2)' '
+       git mktree <top.withsub >actual &&
+       test_cmp tree.withsub actual
+'
+
+test_expect_success 'ls-tree output in wrong order given to mktree (1)' '
+       perl -e "print reverse <>" <top |
+       git mktree >actual &&
+       test_cmp tree actual
+'
+
+test_expect_success 'ls-tree output in wrong order given to mktree (2)' '
+       perl -e "print reverse <>" <top.withsub |
+       git mktree >actual &&
+       test_cmp tree.withsub actual
+'
+
+test_expect_failure 'mktree reads ls-tree -r output (1)' '
+       git mktree <all >actual &&
+       test_cmp tree actual
+'
+
+test_expect_failure 'mktree reads ls-tree -r output (2)' '
+       git mktree <all.withsub >actual &&
+       test_cmp tree.withsub actual
+'
+
+test_done