--- /dev/null
+#!/bin/sh
+
+test_description='unpack-trees error messages'
+
+. ./test-lib.sh
+
+
+test_expect_success 'setup' '
+ echo one >one &&
+ git add one &&
+ git commit -a -m First &&
+
+ git checkout -b branch &&
+ echo two >two &&
+ echo three >three &&
+ echo four >four &&
+ echo five >five &&
+ git add two three four five &&
+ git commit -m Second &&
+
+ git checkout master &&
+ echo other >two &&
+ echo other >three &&
+ echo other >four &&
+ echo other >five
+'
+
+cat >expect <<\EOF
+error: The following untracked working tree files would be overwritten by merge:
+ two
+ three
+ four
+ five
+Please move or remove them before you can merge.
+EOF
+
+test_expect_success 'untracked files overwritten by merge' '
+ test_must_fail git merge branch 2>out &&
+ test_cmp out expect
+'
+
+cat >expect <<\EOF
+error: Your local changes to the following files would be overwritten by merge:
+ two
+ three
+ four
+Please, commit your changes or stash them before you can merge.
+error: The following untracked working tree files would be overwritten by merge:
+ five
+Please move or remove them before you can merge.
+EOF
+
+test_expect_success 'untracked files or local changes ovewritten by merge' '
+ git add two &&
+ git add three &&
+ git add four &&
+ test_must_fail git merge branch 2>out &&
+ test_cmp out expect
+'
+
+cat >expect <<\EOF
+error: Your local changes to the following files would be overwritten by checkout:
+ rep/two
+ rep/one
+Please, commit your changes or stash them before you can switch branches.
+EOF
+
+test_expect_success 'cannot switch branches because of local changes' '
+ git add five &&
+ mkdir rep &&
+ echo one >rep/one &&
+ echo two >rep/two &&
+ git add rep/one rep/two &&
+ git commit -m Fourth &&
+ git checkout master &&
+ echo uno >rep/one &&
+ echo dos >rep/two &&
+ test_must_fail git checkout branch 2>out &&
+ test_cmp out expect
+'
+
+cat >expect <<\EOF
+error: Your local changes to the following files would be overwritten by checkout:
+ rep/two
+ rep/one
+Please, commit your changes or stash them before you can switch branches.
+EOF
+
+test_expect_success 'not uptodate file porcelain checkout error' '
+ git add rep/one rep/two &&
+ test_must_fail git checkout branch 2>out &&
+ test_cmp out expect
+'
+
+cat >expect <<\EOF
+error: Updating the following directories would lose untracked files in it:
+ rep2
+ rep
+
+EOF
+
+test_expect_success 'not_uptodate_dir porcelain checkout error' '
+ git init uptodate &&
+ cd uptodate &&
+ mkdir rep &&
+ mkdir rep2 &&
+ touch rep/foo &&
+ touch rep2/foo &&
+ git add rep/foo rep2/foo &&
+ git commit -m init &&
+ git checkout -b branch &&
+ git rm rep -r &&
+ git rm rep2 -r &&
+ >rep &&
+ >rep2 &&
+ git add rep rep2&&
+ git commit -m "added test as a file" &&
+ git checkout master &&
+ >rep/untracked-file &&
+ >rep2/untracked-file &&
+ test_must_fail git checkout branch 2>out &&
+ test_cmp out ../expect
+'
+
+test_done