diff -r 150fee60887a -r f2ebe960998b tests/testlib/exchange-obsmarker-util.sh
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/testlib/exchange-obsmarker-util.sh	Sat Apr 08 12:48:20 2017 +0200
@@ -0,0 +1,140 @@
+#!/bin/sh
+# setup config and various utility to test obsolescence marker exchanges tests
+
+cat >> $HGRCPATH <<EOF
+[web]
+# We test http pull and push, drop authentication requirement
+push_ssl = false
+allow_push = *
+
+[ui]
+# simpler log output
+logtemplate ="{node|short} ({phase}): {desc}\n"
+
+[phases]
+# non publishing server
+publish=False
+
+[experimental]
+# reduce output changes
+bundle2-output-capture=True
+# enable evolution
+evolution=all
+
+[extensions]
+# we need to strip some changeset for some test cases
+hgext.strip=
+
+[alias]
+# fix date used to create obsolete markers.
+debugobsolete=debugobsolete -d '0 0'
+
+[extensions]
+hgext.strip=
+EOF
+echo "evolve=$(echo $(dirname $TESTDIR))/hgext3rd/evolve/" >> $HGRCPATH
+
+mkcommit() {
+   echo "$1" > "$1"
+   hg add "$1"
+   hg ci -m "$1"
+}
+getid() {
+   hg log --hidden --template '{node}\n' --rev "$1"
+}
+
+setuprepos() {
+    echo creating test repo for test case $1
+    mkdir $1
+    cd $1
+    echo - pulldest
+    hg init pushdest
+    cd pushdest
+    mkcommit O
+    hg phase --public .
+    cd ..
+    echo - main
+    hg clone -q pushdest main
+    echo - pushdest
+    hg clone -q main pulldest
+    echo 'cd into `main` and proceed with env setup'
+}
+
+inspect_obsmarkers (){
+    # This exist as its own function to help the evolve extension reuse the tests as is.
+    # The evolve extensions version will includes more advances query (eg:
+    # related to obsmarkers discovery) to this.
+    echo 'obsstore content'
+    echo '================'
+    hg debugobsolete
+    echo 'obshashtree'
+    echo '==========='
+    hg debugobsrelsethashtree
+    echo 'obshashrange'
+    echo '============'
+    hg debugobshashrange --subranges --rev 'head()'
+}
+
+dotest() {
+    # dotest TESTNAME [TARGETNODE] [PUSHFLAGS+]
+    #
+    # test exchange for the given test case.
+    #
+    # This function performs push and pull in all directions through all
+    # protocols and display the resulting obsolescence markers on all sides.
+
+    testcase=$1
+    shift
+    target="$1"
+    if [ $# -gt 0 ]; then
+        shift
+    fi
+    targetnode=""
+    desccall=""
+    cd $testcase
+    echo "## Running testcase $testcase"
+    if [ -n "$target" ]; then
+        desccall="desc("\'"$target"\'")"
+        targetnode="`hg -R main id -qr \"$desccall\"`"
+        echo "# testing echange of \"$target\" ($targetnode)"
+    fi
+    echo "## initial state"
+    echo "# obstore: main"
+    hg -R main     debugobsolete | sort
+    echo "# obstore: pushdest"
+    hg -R pushdest debugobsolete | sort
+    echo "# obstore: pulldest"
+    hg -R pulldest debugobsolete | sort
+
+    if [ -n "$target" ]; then
+        echo "## pushing \"$target\"" from main to pushdest
+        hg -R main push -r "$desccall" $@ pushdest
+    else
+        echo "## pushing from main to pushdest"
+        hg -R main push pushdest $@
+    fi
+    echo "## post push state"
+    echo "# obstore: main"
+    hg -R main     debugobsolete | sort
+    echo "# obstore: pushdest"
+    hg -R pushdest debugobsolete | sort
+    echo "# obstore: pulldest"
+    hg -R pulldest debugobsolete | sort
+    if [ -n "$target" ]; then
+        echo "## pulling \"$targetnode\"" from main into pulldest
+        hg -R pulldest pull -r $targetnode $@ main
+    else
+        echo "## pulling from main into pulldest"
+        hg -R pulldest pull main $@
+    fi
+    echo "## post pull state"
+    echo "# obstore: main"
+    hg -R main     debugobsolete | sort
+    echo "# obstore: pushdest"
+    hg -R pushdest debugobsolete | sort
+    echo "# obstore: pulldest"
+    hg -R pulldest debugobsolete | sort
+
+    cd ..
+
+}