patch 7.4.1663
Problem: In tests it's often useful to check if a pattern matches.
Solution: Add assert_match().
diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index 7051223..94311e9 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -154,7 +154,7 @@
" Request command "foo bar", which fails silently.
call assert_equal('ok', ch_evalexpr(handle, 'bad command'))
call s:waitFor('v:errmsg =~ "E492"')
- call assert_true(v:errmsg =~ 'E492:.*foo bar')
+ call assert_match('E492:.*foo bar', v:errmsg)
call assert_equal('ok', ch_evalexpr(handle, 'do normal', {'timeout': 100}))
call s:waitFor('"added more" == getline("$")')