[PATCH v2 10/10] evolve: add tests for the git-change command

["Chris Poucet via GitGitGadget" <gitgitgadget@gmail.com>]

From: Chris Poucet <poucet@google.com>

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
Signed-off-by: Chris Poucet <poucet@google.com>
---
 t/t9990-changes.sh | 148 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 148 insertions(+)
 create mode 100755 t/t9990-changes.sh

diff --git a/t/t9990-changes.sh b/t/t9990-changes.sh
new file mode 100755
index 00000000000..11fbd8ba49c
--- /dev/null
+++ b/t/t9990-changes.sh
@@ -0,0 +1,148 @@
+#!/bin/sh
+
+test_description='git change - low level meta-commit management'
+
+. ./test-lib.sh
+
+. "$TEST_DIRECTORY"/lib-rebase.sh
+
+test_expect_success 'setup commits and meta-commits' '
+       for c in one two three
+       do
+               test_commit $c &&
+               git change update --content $c >actual 2>err &&
+               echo "Created change metas/$c" >expect &&
+               test_cmp expect actual &&
+               test_must_be_empty err &&
+               test_cmp_rev refs/metas/$c $c || return 1
+       done
+'
+
+# Check a meta-commit has the correct parents Call with the object
+# name of the meta-commit followed by pairs of type and parent
+check_meta_commit () {
+       name=$1
+       shift
+       while test $# -gt 0
+       do
+               printf '%s %s\n' $1 $(git rev-parse --verify $2)
+               shift
+               shift
+       done | sort >expect
+       git cat-file commit $name >metacommit &&
+       # commit body should consist of parent-type
+           types="$(sed -n '/^$/ {
+                       :loop
+                       n
+                       s/^parent-type //
+                       p
+                       b loop
+                   }' metacommit)" &&
+       while read key value
+       do
+               # TODO: don't sort the first parent
+               if test "$key" = "parent"
+               then
+                       type="${types%% *}"
+                       test -n "$type" || return 1
+                       printf '%s %s\n' $type $value
+                       types="${types#?}"
+                       types="${types# }"
+               elif test "$key" = "tree"
+               then
+                       test_cmp_rev "$value" $EMPTY_TREE || return 1
+               elif test -z "$key"
+               then
+                       # only parse commit headers
+                       break
+               fi
+       done <metacommit >actual-unsorted &&
+       test -z "$types" &&
+       sort >actual <actual-unsorted &&
+       test_cmp expect actual
+}
+
+test_expect_success 'update meta-commits after rebase' '
+       (
+               set_fake_editor &&
+               FAKE_AMEND=edited &&
+               FAKE_LINES="reword 1 pick 2 fixup 3" &&
+               export FAKE_AMEND FAKE_LINES &&
+               git rebase -i --root
+       ) &&
+
+       # update meta-commits
+       git change update --replace tags/one --content HEAD~1 >out 2>err &&
+       echo "Updated change metas/one" >expect &&
+       test_cmp expect out &&
+       test_must_be_empty err &&
+       git change update --replace tags/two --content HEAD@{2} &&
+       oid=$(git rev-parse --verify metas/two) &&
+       git change update --replace HEAD@{2} --replace tags/three \
+               --content HEAD &&
+
+       # check meta-commits
+       check_meta_commit metas/one c HEAD~1 r tags/one &&
+       check_meta_commit $oid c HEAD@{2} r tags/two &&
+       # NB this checks that "git change update" uses the meta-commit ($oid)
+       #    corresponding to the replaces commit (HEAD@2 above) given on the
+       #    commandline.
+       check_meta_commit metas/two c HEAD r $oid r tags/three &&
+       check_meta_commit metas/three c HEAD r $oid r tags/three
+'
+
+reset_meta_commits () {
+    for c in one two three
+    do
+       echo "update refs/metas/$c refs/tags/$c^0"
+    done | git update-ref --stdin
+}
+
+test_expect_success 'override change name' '
+       # TODO: builtin/change.c expects --change to be the full refname,
+       #       ideally it would prepend refs/metas to the string given by the
+       #       user.
+       git change update --change refs/metas/another-one --content one &&
+       test_cmp_rev metas/another-one one
+'
+
+test_expect_success 'non-fast forward meta-commit update refused' '
+       test_must_fail git change update --change refs/metas/one --content two \
+               >out 2>err &&
+       echo "error: non-fast-forward update to ${SQ}refs/metas/one${SQ}" \
+               >expect &&
+       test_cmp expect err &&
+       test_must_be_empty out
+'
+
+test_expect_success 'forced non-fast forward update succeeds' '
+       git change update --change refs/metas/one --content two --force \
+               >out 2>err &&
+       echo "Updated change metas/one" >expect &&
+       test_cmp expect out &&
+       test_must_be_empty err
+'
+
+test_expect_success 'list changes' '
+       cat >expect <<-\EOF &&
+metas/another-one
+metas/one
+metas/three
+metas/two
+EOF
+       git change list >actual &&
+       test_cmp expect actual
+'
+
+test_expect_success 'delete change' '
+       git change delete metas/one &&
+       cat >expect <<-\EOF &&
+metas/another-one
+metas/three
+metas/two
+EOF
+       git change list >actual &&
+       test_cmp expect actual
+'
+
+test_done
-- 
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