Add functional test for subtraction of deleted files

Signed-off-by: Patrick McCarty <patrick.mccarty@intel.com>

Makefile.am

@@ -117,6 +117,7 @@ dist_check_SCRIPTS = \
 	test/functional/no-delta/test.bats \
 	test/functional/pack/test.bats \
 	test/functional/state-file/test.bats \
+	test/functional/subtract-delete/test.bats \
 	test/functional/update/test.bats
 endif
 

test/functional/subtract-delete/test.bats

@@ -0,0 +1,56 @@
+#!/usr/bin/env bats
+
+# common functions
+load "../swupdlib"
+
+setup() {
+  clean_test_dir
+  init_test_dir
+
+  init_server_ini
+  set_latest_ver 0
+  init_groups_ini os-core test-bundle
+
+  # start with both bundles containing a file "foo"
+  set_os_release 10 os-core
+  track_bundle 10 os-core
+  track_bundle 10 test-bundle
+  gen_file_plain 10 os-core foo
+  gen_file_plain 10 test-bundle foo
+
+  # delete "foo" from os-core (the included bundle)
+  set_os_release 20 os-core
+  track_bundle 20 os-core
+  track_bundle 20 test-bundle
+  gen_file_plain 20 test-bundle foo
+
+  # delete "foo" from test-bundle
+  set_os_release 30 os-core
+  track_bundle 30 os-core
+  track_bundle 30 test-bundle
+
+  # make modification (add new file) to test-bundle
+  set_os_release 40 os-core
+  track_bundle 40 os-core
+  track_bundle 40 test-bundle
+  gen_file_plain 40 test-bundle foobar
+}
+
+@test "no subtraction for two deleted files" {
+  sudo $CREATE_UPDATE --osversion 10 --statedir $DIR --format 3
+  set_latest_ver 10
+  sudo $CREATE_UPDATE --osversion 20 --statedir $DIR --format 3
+  set_latest_ver 20
+  sudo $CREATE_UPDATE --osversion 30 --statedir $DIR --format 3
+  set_latest_ver 30
+  sudo $CREATE_UPDATE --osversion 40 --statedir $DIR --format 3
+  set_latest_ver 40
+
+  # If the file is absent in test-bundle, this means it was subtracted. If
+  # present, subtraction was not performed.
+  hash1=$(hash_for 40 test-bundle "/foo")
+  [ -n "$hash1" ]
+}
+
+
+# vi: ft=sh ts=8 sw=2 sts=2 et tw=80