# HG changeset patch
# User Manuel Jacob <me@manueljacob.de>
# Date 1592780602 -7200
# Node ID ce5ebd9c859bd57c9e869ea75afb02675a087049
# Parent  02804d8bac313835772c25bab5f7521561af51b8
tests: add a test determining the branch and topic like the Zsh prompt does it

A patch was sent to the Zsh developers to change the prompt to include the name
of the topic if it is set. It was agreed that I submit a test case to the topic
extension that fails if the format of the files used by Zsh changes.

The current version of the patch can be found here:
https://www.zsh.org/mla/workers/2020/msg00910.html

diff -r 02804d8bac31 -r ce5ebd9c859b tests/test-topic-shell-prompt.t
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/test-topic-shell-prompt.t	Mon Jun 22 01:03:22 2020 +0200
@@ -0,0 +1,29 @@
+  $ . $TESTDIR/testlib/topic_setup.sh
+
+Code logically equivalent to the following is used in Zsh to show the branch
+and topic (if set) in the prompt. If the format of the files is changed in a
+way that it breaks the test, a mail should be sent to zsh-workers@zsh.org.
+
+  $ get_branch_like_zsh() {
+  >     branchfile=".hg/branch"
+  >     topicfile=".hg/topic"
+  >     if [ -r "${branchfile}" ] ; then
+  >         r_branch=$(cat "${branchfile}")
+  >     fi
+  >     if [ -f "${topicfile}" ] && [ -r "${topicfile}" ] && [ -s "${topicfile}" ] ; then
+  >         IFS= read -r REPLY < ${topicfile}
+  >         r_branch=${r_branch}:${REPLY}
+  >     fi
+  >     echo $r_branch
+  > }
+
+  $ hg init
+  $ hg branch branch -q
+  $ get_branch_like_zsh
+  branch
+  $ hg topic topic -q
+  $ get_branch_like_zsh
+  branch:topic
+  $ hg topic --clear -q
+  $ get_branch_like_zsh
+  branch