feat(tests): improve http_mock (#12325)

support add dictionaries; fix the behavior when no body is sent

spec/helpers/http_mock.lua

@@ -187,6 +187,7 @@ function http_mock.new(listens, routes, opts)
     listens = listens,
     routes = routes,
     directives = directives,
+    dicts = opts.dicts,
     init = opts.init,
     log_opts = log_opts,
     logs = {},

spec/helpers/http_mock/template.lua

@@ -24,6 +24,10 @@ events {
 http {
   lua_shared_dict mock_logs $(shm_size);
 
+# for dict, size in pairs(dicts or {}) do
+  lua_shared_dict $(dict) $(size);
+# end
+
   init_by_lua_block {
 # if log_opts.err then
     -- disable warning of global variable
@@ -148,18 +152,20 @@ $(init)
 # if log_opts.req_body then
         -- collect body
         body = ngx.req.get_body_data()
-# if log_opts.req_large_body then
         if not body then
           local file = ngx.req.get_body_file()
           if file then
+# if log_opts.req_large_body then
             local f = io.open(file, "r")
             if f then
               body = f:read("*a")
               f:close()
             end
+# else
+            body = { "body is too large" }
+# end -- if log_opts.req_large_body
           end
         end
-# end -- if log_opts.req_large_body
 # end -- if log_opts.req_body
         ngx.ctx.req = {
           method = method,
@@ -238,4 +244,4 @@ $(init)
 # end  -- for location, route in pairs(routes)
   }
 }
-]]
+]]