Add test files for patch 7.4.771.

vim-patch:efcabd6892ad89a4585fb77aa94c3b1802b784ab

test/functional/legacy/search_mbyte_spec.lua

@@ -0,0 +1,31 @@
+-- Test for search('multi-byte char', 'bce')
+
+local helpers = require('test.functional.helpers')
+local feed, insert, source = helpers.feed, helpers.insert, helpers.source
+local clear, execute, expect = helpers.clear, helpers.execute, helpers.expect
+
+describe('search_mbyte', function()
+  setup(clear)
+
+  it('is working', function()
+    insert([=[
+      Results:
+      
+      Test bce:
+      Ａ]=])
+
+    execute('source small.vim')
+    execute('source mbyte.vim')
+    execute('set encoding=utf-8')
+    execute('/^Test bce:/+1')
+    execute([[$put =search('Ａ', 'bce', line('.'))]])
+
+    -- Assert buffer contents.
+    expect([=[
+      Results:
+      
+      Test bce:
+      Ａ
+      4]=])
+  end)
+end)