stash: add t3906 for submodule updates

Test that the stash apply command updates the work tree as expected for
changes which don't result in conflicts. To make that work add a helper
function that uses read-tree to apply the changes of the target commit
to the work tree, then stashes these changes and at last applies that
stash.

Implement the KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES switch
and reuse two other already present switches to expect the known
failure that stash does ignore submodule changes.

Signed-off-by: Jens Lehmann <Jens.Lehmann@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/lib-submodule-update.sh b/t/lib-submodule-update.sh
index d499b27..79cdd34 100755 (executable)
--- a/t/lib-submodule-update.sh
+++ b/t/lib-submodule-update.sh
@@ -227,7 +227,14 @@ test_submodule_switch () {
        command="$1"
        ######################### Appearing submodule #########################
        # Switching to a commit letting a submodule appear creates empty dir ...
-       test_expect_success "$command: added submodule creates empty directory" '
+       if test "$KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES" = 1
+       then
+               # Restoring stash fails to restore submodule index entry
+               RESULT="failure"
+       else
+               RESULT="success"
+       fi
+       test_expect_$RESULT "$command: added submodule creates empty directory" '
                prolog &&
                reset_work_tree_to no_submodule &&
                (
@@ -241,7 +248,7 @@ test_submodule_switch () {
                )
        '
        # ... and doesn't care if it already exists ...
-       test_expect_success "$command: added submodule leaves existing empty directory alone" '
+       test_expect_$RESULT "$command: added submodule leaves existing empty directory alone" '
                prolog &&
                reset_work_tree_to no_submodule &&
                (
@@ -270,7 +277,7 @@ test_submodule_switch () {
        '
        # Replacing a tracked file with a submodule produces an empty
        # directory ...
-       test_expect_success "$command: replace tracked file with submodule creates empty directory" '
+       test_expect_$RESULT "$command: replace tracked file with submodule creates empty directory" '
                prolog &&
                reset_work_tree_to replace_sub1_with_file &&
                (
@@ -310,7 +317,13 @@ test_submodule_switch () {
 
        ######################## Disappearing submodule #######################
        # Removing a submodule doesn't remove its work tree ...
-       test_expect_success "$command: removed submodule leaves submodule directory and its contents in place" '
+       if test "$KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES" = 1
+       then
+               RESULT="failure"
+       else
+               RESULT="success"
+       fi
+       test_expect_$RESULT "$command: removed submodule leaves submodule directory and its contents in place" '
                prolog &&
                reset_work_tree_to add_sub1 &&
                (
@@ -322,7 +335,7 @@ test_submodule_switch () {
                )
        '
        # ... especially when it contains a .git directory.
-       test_expect_success "$command: removed submodule leaves submodule containing a .git directory alone" '
+       test_expect_$RESULT "$command: removed submodule leaves submodule containing a .git directory alone" '
                prolog &&
                reset_work_tree_to add_sub1 &&
                (

diff --git a/t/t3906-stash-submodule.sh b/t/t3906-stash-submodule.sh
new file mode 100755 (executable)
index 0000000..d7219d6
--- /dev/null
+++ b/t/t3906-stash-submodule.sh
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+test_description='stash apply can handle submodules'
+
+. ./test-lib.sh
+. "$TEST_DIRECTORY"/lib-submodule-update.sh
+
+git_stash () {
+       git status -su >expect &&
+       ls -1pR * >>expect &&
+       git read-tree -u -m "$1" &&
+       git stash &&
+       git status -su >actual &&
+       ls -1pR * >>actual &&
+       test_cmp expect actual &&
+       git stash apply
+}
+
+KNOWN_FAILURE_STASH_DOES_IGNORE_SUBMODULE_CHANGES=1
+KNOWN_FAILURE_CHERRY_PICK_SEES_EMPTY_COMMIT=1
+KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR=1
+test_submodule_switch "git_stash"
+
+test_done