* jc/maint-1.6.0-diff-borrow-carefully:
diff --cached: do not borrow from a work tree when a path is marked as assume-unchanged
test_expect_success 'force diff with "diff"' '
echo >.gitattributes "file diff" &&
git diff >actual &&
- test_cmp ../t4020/diff.NUL actual
+ test_cmp "$TEST_DIRECTORY"/t4020/diff.NUL actual
'
+ test_expect_success 'diff --cached' '
+ git add file &&
+ git update-index --assume-unchanged file &&
+ echo second >file &&
+ git diff --cached >actual &&
+ test_cmp ../t4020/diff.NUL actual
+ '
+
test_done