t4140: test apply with i-t-a paths

apply --cached (as used by add -p) should accept creation and deletion
patches to intent-to-add paths in the index. apply --index, however,
should always fail because an intent-to-add path never matches the
worktree (by definition).

Based-on-patch-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Raymond E. Pasco <ray@ameretat.dev>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t4140-apply-ita.sh b/t/t4140-apply-ita.sh
new file mode 100755 (executable)
index 0000000..c614eaf
--- /dev/null
+++ b/t/t4140-apply-ita.sh
@@ -0,0 +1,56 @@
+#!/bin/sh
+
+test_description='git apply of i-t-a file'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+       test_write_lines 1 2 3 4 5 >blueprint &&
+
+       cat blueprint >test-file &&
+       git add -N test-file &&
+       git diff >creation-patch &&
+       grep "new file mode 100644" creation-patch &&
+
+       rm -f test-file &&
+       git diff >deletion-patch &&
+       grep "deleted file mode 100644" deletion-patch
+'
+
+test_expect_success 'apply creation patch to ita path (--cached)' '
+       git rm -f test-file &&
+       cat blueprint >test-file &&
+       git add -N test-file &&
+
+       git apply --cached creation-patch &&
+       git cat-file blob :test-file >actual &&
+       test_cmp blueprint actual
+'
+
+test_expect_success 'apply creation patch to ita path (--index)' '
+       git rm -f test-file &&
+       cat blueprint >test-file &&
+       git add -N test-file &&
+       rm -f test-file &&
+
+       test_must_fail git apply --index creation-patch
+'
+
+test_expect_success 'apply deletion patch to ita path (--cached)' '
+       git rm -f test-file &&
+       cat blueprint >test-file &&
+       git add -N test-file &&
+
+       git apply --cached deletion-patch &&
+       test_must_fail git ls-files --stage --error-unmatch test-file
+'
+
+test_expect_success 'apply deletion patch to ita path (--index)' '
+       cat blueprint >test-file &&
+       git add -N test-file &&
+
+       test_must_fail git apply --index deletion-patch &&
+       git ls-files --stage --error-unmatch test-file
+'
+
+test_done