def test_link_to_merged_revno(self):
        bmp = self.makeBranchMergeProposal()
        login_person(bmp.registrant)
        target_identity = bmp.merge_target.identity
        bmp.markAsMerged(merge_reporter=bmp.registrant)
        browser = self.getViewBrowser(bmp, '+merged', user=bmp.registrant)
        browser.getControl(self.merged_revision_text).value = str(
            self.arbitrary_revisions[2])
        browser.getControl('Mark as Merged').click()
        browser = self.getViewBrowser(bmp.merge_source, '+index')
        revision_link = '%s/revision/%s' % (target_identity,
            self.arbitrary_revisions[2])
        revision_number = Tag(
            'Revision number', 'a', {'href': revision_link},
            text='revision %s' % self.arbitrary_revisions[2])
        self.assertThat(browser.contents, HTMLContains(revision_number))