Add a failing test to confirm a conflicted stash apply
invokes rerere to record the conflicts and resolve the
the files it can.

mergetool may be confused by a left-over
state from previous rerere activity causing it to
think no files have conflicts even though they do.
This condition is not verified by this test since a
subsequent commit will change the behavior to enable
rerere for stash conflicts.

Also, the next test expected us to finish up with a reset,
which is impossible to do if we fail (as we must) and it's
an unreasonable expectation anyway.  Begin the next test
with a reset of his own instead.

Signed-off-by: Phil Hord <ho...@cisco.com>
---
 t/t7610-mergetool.sh | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/t/t7610-mergetool.sh b/t/t7610-mergetool.sh
index f5e16fc..725f316 100755
--- a/t/t7610-mergetool.sh
+++ b/t/t7610-mergetool.sh
@@ -55,6 +55,16 @@ test_expect_success 'setup' '
     git rm file12 &&
     git commit -m "branch1 changes" &&
 
+    git checkout -b stash1 master &&
+    echo stash1 change file11 >file11 &&
+    git add file11 &&
+    git commit -m "stash1 changes" &&
+
+    git checkout -b stash2 master &&
+    echo stash2 change file11 >file11 &&
+    git add file11 &&
+    git commit -m "stash2 changes" &&
+
     git checkout master &&
     git submodule update -N &&
     echo master updated >file1 &&
@@ -193,7 +203,35 @@ test_expect_success 'mergetool skips resolved paths when 
rerere is active' '
     git reset --hard
 '
 
+test_expect_failure 'conflicted stash sets up rerere'  '
+    git config rerere.enabled true &&
+    git checkout stash1 &&
+    echo "Conflicting stash content" >file11 &&
+    git stash &&
+
+    git checkout --detach stash2 &&
+    test_must_fail git stash apply &&
+
+    test -n "$(git ls-files -u)" &&
+    conflicts="$(git rerere remaining)" &&
+    test "$conflicts" = "file11" &&
+    output="$(git mergetool --no-prompt)" &&
+    test "$output" != "No files need merging" &&
+
+    git commit -am "save the stash resolution" &&
+
+    git reset --hard stash2 &&
+    test_must_fail git stash apply &&
+
+    test -n "$(git ls-files -u)" &&
+    conflicts="$(git rerere remaining)" &&
+    test -z "$conflicts" &&
+    output="$(git mergetool --no-prompt)" &&
+    test "$output" = "No files need merging"
+'
+
 test_expect_success 'mergetool takes partial path' '
+    git reset --hard
     git config rerere.enabled false &&
     git checkout -b test12 branch1 &&
     git submodule update -N &&
-- 
1.7.11.1.213.gb567ea5.dirty

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