diff --git a/t/merge-check.t b/t/merge-check.t
new file mode 100755
index 0000000..33a5356
--- /dev/null
+++ b/t/merge-check.t
@@ -0,0 +1,95 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+# this is hardcoded; change it if needed
+use lib "src";
+use Gitolite::Test;
+
+# merge check -- the M flag
+# ----------------------------------------------------------------------
+
+try "plan 57";
+
+confreset;confadd '
+    repo  foo
+          RW+M      =   u1
+          RW+       =   u2
+          RWM      .=   u3
+          RW        =   u4
+';
+
+try "ADMIN_PUSH set1; !/FATAL/" or die text();
+
+# setup a merged push
+
+try "
+    cd ..
+    ls -al foo;         !ok;    /cannot access foo: No such file or directory/
+    glt clone u1 file:///foo
+                        ok;     /Cloning into/
+                                /You appear to have cloned an empty/
+";
+
+try "
+    cd foo;             ok
+    ls -Al;             ok;     /\.git/
+    test-commit aa;     ok;     /1 files changed, 1 insertions/
+    tag start;          ok
+    glt push u1 origin master
+                        ok;     /new branch.*master.-..master/
+                                /create.delete ignored.*merge-check/
+    checkout -b new;    ok;     /Switched to a new branch 'new'/
+    test-commit bb cc;  ok
+    checkout master;    ok;     /Switched to branch 'master'/
+    test-commit dd ee;  ok
+    git merge new;      ok;     /Merge made.*recursive/
+    test-commit ff;     ok
+    tag end;            ok
+";
+
+# push by u4 should fail
+try "
+    glt push u4 file:///foo master
+                        !ok;    /WM refs/heads/master foo u4 DENIED by fallthru/
+                                /To file:///foo/
+                                /remote rejected.*hook declined/
+                                /failed to push some refs/
+";
+
+# push by u3 should succeed
+try "
+    glt push u3 file:///foo master
+                        ok;     /To file:///foo/; /master.-..master/
+";
+
+# rewind by u3 should fail
+try "
+    reset-h start;      ok;     /HEAD is now at .* aa /
+    glt push u3 file:///foo +master
+                         !ok;   /rejected.*hook declined/
+                                /failed to push some refs/
+";
+
+# rewind by u2 should succeed
+try "
+    glt push u2 file:///foo +master
+                         ok;    /To file:///foo/
+                                /forced update/
+";
+
+# push by u2 should fail
+try "
+    reset-h end;        ok;     /HEAD is now at .* ff /
+    glt push u2 file:///foo master
+                        !ok;    /WM refs/heads/master foo u2 DENIED by fallthru/
+                                /To file:///foo/
+                                /remote rejected.*hook declined/
+                                /failed to push some refs/
+";
+
+# push by u1 should succeed
+try "
+    glt push u1 file:///foo master
+                        ok;     /master.-..master/
+";