diff --git a/tests/test-obsmarkers-effectflag.t b/tests/test-obsmarkers-effectflag.t
new file mode 100644
--- /dev/null
+++ b/tests/test-obsmarkers-effectflag.t
@@ -0,0 +1,167 @@
+Test the 'effect-flags' feature
+
+Global setup
+============
+
+  $ . $TESTDIR/testlib/obsmarker-common.sh
+  $ cat >> $HGRCPATH <<EOF
+  > [ui]
+  > interactive = true
+  > [phases]
+  > publish=False
+  > [extensions]
+  > rebase =
+  > [experimental]
+  > evolution = all
+  > effect-flags = 1
+  > EOF
+
+  $ hg init $TESTTMP/effect-flags
+  $ cd $TESTTMP/effect-flags
+  $ mkcommit ROOT
+
+amend touching the description only
+-----------------------------------
+
+  $ mkcommit A0
+  $ hg commit --amend -m "A1"
+
+check result
+
+  $ hg debugobsolete --rev .
+  471f378eab4c5e25f6c77f785b27c936efb22874 fdf9bde5129a28d4548fadd3f62b265cdd3b7a2e 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}
+
+amend touching the user only
+----------------------------
+
+  $ mkcommit B0
+  $ hg commit --amend -u "bob <bob@bob.com>"
+
+check result
+
+  $ hg debugobsolete --rev .
+  ef4a313b1e0ade55718395d80e6b88c5ccd875eb 5485c92d34330dac9d7a63dc07e1e3373835b964 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}
+
+amend touching the date only
+----------------------------
+
+  $ mkcommit B1
+  $ hg commit --amend -d "42 0"
+
+check result
+
+  $ hg debugobsolete --rev .
+  2ef0680ff45038ac28c9f1ff3644341f54487280 4dd84345082e9e5291c2e6b3f335bbf8bf389378 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}
+
+amend touching the branch only
+----------------------------
+
+  $ mkcommit B2
+  $ hg branch my-branch
+  marked working directory as branch my-branch
+  (branches are permanent and global, did you want a bookmark?)
+  $ hg commit --amend
+
+check result
+
+  $ hg debugobsolete --rev .
+  bd3db8264ceebf1966319f5df3be7aac6acd1a8e 14a01456e0574f0e0a0b15b2345486a6364a8d79 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}
+
+  $ hg up default
+  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
+
+rebase (parents change)
+-----------------------
+
+  $ mkcommit C0
+  $ mkcommit D0
+  $ hg rebase -r . -d 'desc(B0)'
+  rebasing 10:c85eff83a034 "D0" (tip)
+
+check result
+
+  $ hg debugobsolete --rev .
+  c85eff83a0340efd9da52b806a94c350222f3371 da86aa2f19a30d6686b15cae15c7b6c908ec9699 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'rebase', 'user': 'test'}
+
+amend touching the diff
+-----------------------
+
+  $ mkcommit E0
+  $ echo 42 >> E0
+  $ hg commit --amend
+
+check result
+
+  $ hg debugobsolete --rev .
+  ebfe0333e0d96f68a917afd97c0a0af87f1c3b5f 75781fdbdbf58a987516b00c980bccda1e9ae588 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}
+
+amend with multiple effect (desc and meta)
+-------------------------------------------
+
+  $ mkcommit F0
+  $ hg branch my-other-branch
+  marked working directory as branch my-other-branch
+  $ hg commit --amend -m F1 -u "bob <bob@bob.com>" -d "42 0"
+
+check result
+
+  $ hg debugobsolete --rev .
+  fad47e5bd78e6aa4db1b5a0a1751bc12563655ff a94e0fd5f1c81d969381a76eb0d37ce499a44fae 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}
+
+rebase not touching the diff
+----------------------------
+
+  $ cat << EOF > H0
+  > 0
+  > 1
+  > 2
+  > 3
+  > 4
+  > 5
+  > 6
+  > 7
+  > 8
+  > 9
+  > 10
+  > EOF
+  $ hg add H0
+  $ hg commit -m 'H0'
+  $ echo "H1" >> H0
+  $ hg commit -m "H1"
+  $ hg up -r "desc(H0)"
+  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
+  $ cat << EOF > H0
+  > H2
+  > 0
+  > 1
+  > 2
+  > 3
+  > 4
+  > 5
+  > 6
+  > 7
+  > 8
+  > 9
+  > 10
+  > EOF
+  $ hg commit -m "H2"
+  created new head
+  $ hg rebase -s "desc(H1)" -d "desc(H2)" -t :merge3
+  rebasing 17:b57fed8d8322 "H1"
+  merging H0
+  $ hg debugobsolete -r tip
+  b57fed8d83228a8ae3748d8c3760a77638dd4f8c e509e2eb3df5d131ff7c02350bf2a9edd0c09478 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'rebase', 'user': 'test'}
+
+amend closing the branch should be detected as meta change
+----------------------------------------------------------
+
+  $ hg branch closedbranch
+  marked working directory as branch closedbranch
+  $ mkcommit G0
+  $ mkcommit I0
+  $ hg commit --amend --close-branch
+
+check result
+
+  $ hg debugobsolete -r .
+  2f599e54c1c6974299065cdf54e1ad640bfb7b5d 12c6238b5e371eea00fd2013b12edce3f070928b 0 (Thu Jan 01 00:00:00 1970 +0000) {'ef1': '0', 'operation': 'amend', 'user': 'test'}