Update tests, debug logging, global variable warnings

Author: hamishforbes

t/01-basic.t

@@ -304,7 +304,7 @@ bad uri: http:///example.com
         content_by_lua '
             local http = require("resty.http").new()
 
-            function test_uri(uri)
+            local function test_uri(uri)
                 local scheme, host, port, path, query = unpack(http:parse_uri(uri, false))
                 ngx.say("scheme: ", scheme, ", host: ", host, ", port: ", port, ", path: ", path, ", query: ", query)
             end
@@ -342,7 +342,7 @@ scheme: http, host: example.com, port: 80, path: /foo/bar, query: a=1&b=2
         content_by_lua '
             local http = require("resty.http").new()
 
-            function test_uri(uri)
+            local function test_uri(uri)
                 local scheme, host, port, path, query = unpack(http:parse_uri(uri))
                 ngx.say("scheme: ", scheme, ", host: ", host, ", port: ", port, ", path: ", path)
             end
@@ -410,4 +410,4 @@ Test
 OK
 --- no_error_log
 [error]
-[warn]
+[warn]

t/14-host-header.t

@@ -19,6 +19,8 @@ our $HttpConfig = qq{
             jit.off()
             require("luacov.runner").init()
         end
+
+        require("resty.http").debug(true)
     }
 };
 
@@ -89,6 +91,7 @@ Host: www.google.com
 --- config
     location /lua {
         content_by_lua '
+            require("resty.http").debug(true)
             local http = require "resty.http"
             local httpc = http.new()
 
@@ -117,6 +120,7 @@ Host: 127.0.0.1:8080
 --- config
     location /lua {
         content_by_lua '
+            require("resty.http").debug(true)
             local http = require "resty.http"
             local httpc = http.new()
 
@@ -178,6 +182,7 @@ Unable to generate a useful Host header for a unix domain socket. Please provide
 --- config
     location /lua {
         content_by_lua '
+            require("resty.http").debug(true)
             local http = require "resty.http"
             local httpc = http.new()
             httpc:set_proxy_options({

t/16-http-proxy.t

@@ -57,7 +57,7 @@ nil
 
             -- helper that verifies get_proxy_uri works correctly with the given
             -- scheme, host and no_proxy list
-            function test_no_proxy(scheme, host, no_proxy)
+            local function test_no_proxy(scheme, host, no_proxy)
                 httpc:set_proxy_options({
                     http_proxy = "http://http_proxy.example.com",
                     https_proxy = "http://https_proxy.example.com",
@@ -126,7 +126,7 @@ scheme: http, host: notexample.com, no_proxy: example.com, proxy_uri: http://htt
 
             -- helper that configures the proxy opts as proived and checks what
             -- get_proxy_uri says for the given scheme / host pair
-            function test_get_proxy_uri(scheme, host, http_proxy, https_proxy)
+            local function test_get_proxy_uri(scheme, host, http_proxy, https_proxy)
                 httpc:set_proxy_options({
                     http_proxy = http_proxy,
                     https_proxy = https_proxy