Fix TestDriver to let plugin instance always to have its class name

[sonots]

Noticed via fluent/fluent-plugin-s3#154

v0.14 TestLogger currently outputs as:

2011-01-03 13:07:36 +0000 [warn]: [] out_s3: delayed events were put

when a TestDriver is created with a block.

v0.14 TestLogger tries to add optional_header like [#{self.class.name}]

From: fluent/fluentd/lib/fluent/log.rb @ line 426 Fluent::PluginLoggerMixin#configure:

    422: def configure(conf)
    423:   super

    428:   if level = conf['@log_level']
    429:     unless @log.is_a?(PluginLogger)
    430:       @log = PluginLogger.new($log.dup)
    431:     end
    432:     @log.level = level
    433:     @log.optional_header = "[#{self.class.name}#{plugin_id_configured? ? "(" + @id + ")" : ""}] "
    434:     @log.optional_attrs = {}
    435:   end
    436: end

but, TestDriver creates plugin instance with Class.new if block is given, therefore, it does not have class name. In such case we get the extra [].

With this fix, we will get [Fluent::S3Output] as we expect.

[tagomoris]

LGTM, but it's missed to fix for v0.14 test drivers.

[tagomoris]

@sonots ping?

[sonots]

Modified similarly ParserTestDriver and FormatterTestDriver

[tagomoris]

I meant that the same fix is needed for v0.14 plugin test drivers under fluent/test/driver.

[sonots]

Sorry to be late. Fixed for test drivers under fluent/test/driver, too.

[tagomoris]

LGTM.