--- a/tests/test-issue-6028.t	Fri Sep 13 16:04:32 2019 +0200
+++ b/tests/test-issue-6028.t	Thu Sep 19 11:46:16 2019 +0700
@@ -25,10 +25,12 @@
   $ cd $TESTTMP/issue-6028
 
 create initial commit
+
   $ echo "0" > 0
   $ hg ci -Am 0
   adding 0
 
+start new topics "a" and "b" both from 0
 
   $ hg up default
   0 files updated, 0 files merged, 0 files removed, 0 files unresolved
@@ -40,7 +42,6 @@
   active topic 'a' grew its first changeset
   (see 'hg help topics' for more information)
 
-
   $ hg up default
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ hg topics b
@@ -51,6 +52,8 @@
   active topic 'b' grew its first changeset
   (see 'hg help topics' for more information)
 
+create branch "integration" from 0, merge topics "a" and "b" into it
+
   $ hg up default
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
   $ hg branch integration
@@ -66,6 +69,8 @@
   (branch merge, don't forget to commit)
   $ hg ci -m "merged b"
 
+commit a bad file on topic "a", merge it into "integration"
+
   $ hg up a
   switching to topic a
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
@@ -79,6 +84,8 @@
   (branch merge, don't forget to commit)
   $ hg ci -m "merged a bad commit"
 
+add more commits on both topics and merge them into "integration"
+
   $ hg up a
   switching to topic a
   0 files updated, 0 files merged, 1 files removed, 0 files unresolved
@@ -103,7 +110,12 @@
   (branch merge, don't forget to commit)
   $ hg ci -m "merged bb"
 
-create instability by pruning two changesets, one in a topic, one in a merge
+create instability by pruning two changesets, one in a topic, one a merge
+
+  $ hg log -r 5:6 -T '{rev}: {desc}\n'
+  5: a bad commit
+  6: merged a bad commit
+
   $ hg prune -r 5:6
   2 changesets pruned
   3 new orphan changesets
@@ -112,12 +124,47 @@
   2 files updated, 0 files merged, 1 files removed, 0 files unresolved
 
 start the evolve
+
   $ hg evolve --update --no-all
   move:[8] merged aa
   atop:[4] merged b
   working directory is now at c920dd828523
 
+casually checking issue6141: position of p2 is not changed
+
+  $ hg log -r 'predecessors(.) + .'
+  changeset:   8:3f6f25057afb
+  branch:      integration
+  parent:      6:cfc4c333724f
+  parent:      7:61eff7f7bb6c
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  obsolete:    rebased using evolve as 11:c920dd828523
+  summary:     merged aa
+  
+  changeset:   11:c920dd828523
+  branch:      integration
+  tag:         tip
+  parent:      4:e33aee2c715e
+  parent:      7:61eff7f7bb6c
+  user:        test
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  instability: orphan
+  summary:     merged aa
+  
+
+test that we successfully got rid of the bad file
+
+  $ hg d --git -r 'predecessors(.)' -r '.'
+  diff --git a/a_bad_commit b/a_bad_commit
+  deleted file mode 100644
+  --- a/a_bad_commit
+  +++ /dev/null
+  @@ -1,1 +0,0 @@
+  -a bad commit
+
 evolve creates an obsolete changeset above as 11
+
   $ hg evolve -r .
   cannot solve instability of c920dd828523, skipping
   cannot solve instability of c920dd828523, skipping