Add a minimal test for git-cherry

This test checks that git-cherry finds the expected number of patches
in two simple cases, and then tests the new limit arguments.

[jc: collapsed two patches into one and added sleep to make sure
 the two commits would get different timestamps]

Signed-off-by: Yann Dirson <ydirson@altern.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>

t/t3500-cherry.sh

@@ -0,0 +1,53 @@
+#!/bin/sh
+#
+# Copyright (c) 2006 Yann Dirson, based on t3400 by Amos Waterland
+#
+
+test_description='git-cherry should detect patches integrated upstream
+
+This test cherry-picks one local change of two into master branch, and
+checks that git-cherry only returns the second patch in the local branch
+'
+. ./test-lib.sh
+
+export GIT_AUTHOR_EMAIL=bogus_email_address
+
+test_expect_success \
+    'prepare repository with topic branch, and check cherry finds the 2 patches from there' \
+    'echo First > A &&
+     git-update-index --add A &&
+     git-commit -m "Add A." &&
+
+     git-checkout -b my-topic-branch &&
+
+     echo Second > B &&
+     git-update-index --add B &&
+     git-commit -m "Add B." &&
+
+     sleep 2 &&
+     echo AnotherSecond > C &&
+     git-update-index --add C &&
+     git-commit -m "Add C." &&
+
+     git-checkout -f master &&
+
+     echo Third >> A &&
+     git-update-index A &&
+     git-commit -m "Modify A." &&
+
+     expr "$(echo $(git-cherry master my-topic-branch) )" : "+ [^ ]* + .*"
+'
+
+test_expect_success \
+    'check that cherry with limit returns only the top patch'\
+    'expr "$(echo $(git-cherry master my-topic-branch my-topic-branch^1) )" : "+ [^ ]*"
+'
+
+test_expect_success \
+    'cherry-pick one of the 2 patches, and check cherry recognized one and only one as new' \
+    'git-cherry-pick my-topic-branch^0 &&
+     echo $(git-cherry master my-topic-branch) &&
+     expr "$(echo $(git-cherry master my-topic-branch) )" : "+ [^ ]* - .*"
+'
+
+test_done