Re: [PATCH v3 contrib/subtree 1/1] Add a test for subtree rebase that loses commits

> From: David A. Greene <greened@obbligato.org>
>
> This test merges an external tree in as a subtree, makes some commits
> on top of it and splits it back out.  In the process the added commits
> are lost or the rebase aborts with an internal error.  The tests are
> marked to expect failure so that we don't forget to fix it.
>
> Signed-off-by: David A. Greene <greened@obbligato.org>
> ---
>
> Notes:
>     Change History:
>
>     v1 - Initial version
>     v2 - Additional tests and code cleanup
>     v3 - Remove check_equal, mark comments on failure and remove
>          test_debug statements

>  t/t3427-rebase-subtree.sh | 79 +++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 79 insertions(+)
>
> diff --git a/t/t3427-rebase-subtree.sh b/t/t3427-rebase-subtree.sh
> new file mode 100755
> index 0000000..add3b79
> --- /dev/null
> +++ b/t/t3427-rebase-subtree.sh
> @@ -0,0 +1,79 @@
> +#!/bin/sh
> +
> +test_description='git rebase tests for -Xsubtree
> +
> +This test runs git rebase and tests the subtree strategy.
> +'
> +. ./test-lib.sh
> +. "$TEST_DIRECTORY"/lib-rebase.sh
> +
> +check_equal() {
> +       test_debug 'echo'
> +       test_debug "echo \"check a:\" \"{$1}\""
> +       test_debug "echo \"      b:\" \"{$2}\""
> +       test "$1" = "$2"
> +}
> +
> +last_commit_message() {
> +       git log --pretty=format:%s -1
> +}
> +
> +test_expect_success 'setup' '
> +       test_commit README &&
> +       mkdir files &&
> +       (
> +               cd files &&
> +               git init &&
> +               test_commit master1 &&
> +               test_commit master2 &&
> +               test_commit master3
> +       ) &&
> +       test_debug "echo Add project master to master" &&
> +       git fetch files master &&
> +       git branch files-master FETCH_HEAD &&
> +       test_debug "echo Add subtree master to master via subtree" &&
> +       git read-tree --prefix=files_subtree files-master &&
> +       git checkout -- files_subtree &&
> +       tree=$(git write-tree) &&
> +       head=$(git rev-parse HEAD) &&
> +       rev=$(git rev-parse --verify files-master^0) &&
> +       commit=$(git commit-tree -p $head -p $rev -m "Add subproject master" $tree) &&
> +       git reset $commit &&
> +       (
> +               cd files_subtree &&
> +               test_commit master4
> +       ) &&
> +       test_commit files_subtree/master5
> +'
> +
> +# Does not preserve master4 and master5.
> +test_expect_failure 'Rebase -Xsubtree --preserve-merges --onto' '
> +       reset_rebase &&
> +       git checkout -b rebase-preserve-merges master &&
> +       git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
> +       git commit -m "Empty commit" --allow-empty &&
> +       git rebase -Xsubtree=files_subtree --preserve-merges --onto files-master master &&
> +       check_equal "$(last_commit_message)" "files_subtree/master5"
> +'
> +
> +# Does not preserve master4, master5 and empty.
> +test_expect_failure 'Rebase -Xsubtree --keep-empty --preserve-merges --onto' '
> +       reset_rebase &&
> +       git checkout -b rebase-keep-empty master &&
> +       git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
> +       git commit -m "Empty commit" --allow-empty &&
> +       git rebase -Xsubtree=files_subtree --keep-empty --preserve-merges --onto files-master master &&
> +       check_equal "$(last_commit_message)" "Empty commit"
> +'
> +
> +# fatal: Could not parse object
> +test_expect_failure 'Rebase -Xsubtree --onto' '
> +       reset_rebase &&
> +       git checkout -b rebase-onto master &&
> +       git filter-branch --prune-empty -f --subdirectory-filter files_subtree &&
> +       git commit -m "Empty commit" --allow-empty &&
> +       git rebase -Xsubtree=files_subtree --onto files-master master &&
> +       check_equal "$(last_commit_message)" "Empty commit"
> +'
> +
> +test_done
> --
> 2.6.1