Fix MulticastLogger DEBUG mode

lib/vmdb/loggers.rb

@@ -130,7 +130,10 @@ def self.create_loggers
     private_class_method :create_loggers
 
     def self.create_multicast_logger(log_file_path, logger_class = VMDBLogger)
-      MulticastLogger.new(logger_class.new(log_file_path)).tap do |l|
+      logger_instance = logger_class.new(log_file_path).tap do |logger|
+        logger.level = Logger::DEBUG
+      end
+      MulticastLogger.new(logger_instance).tap do |l|
         l.loggers << $container_log if ENV["CONTAINER"]
       end
     end

spec/lib/vmdb/loggers_spec.rb

@@ -0,0 +1,54 @@
+describe Vmdb::Loggers do
+  let(:log_file) { Rails.root.join("log", "foo.log").to_s }
+
+  def in_container_env(example)
+    old_env = ENV.delete('CONTAINER')
+    ENV['CONTAINER'] = 'true'
+    example.run
+  ensure
+    # ENV['x'] = nil deletes the key because ENV accepts only string values
+    ENV['CONTAINER'] = old_env
+  end
+
+  describe "#create_multicast_logger (private)" do
+    it "defaults the lower level loggers to `DEBUG`" do
+      log = described_class.send(:create_multicast_logger, log_file)
+
+      expect(log.loggers.first.level).to eq(Logger::DEBUG)
+      expect(log.loggers.to_a.size).to   eq(1)
+    end
+
+    context "in a container environment" do
+      around { |example| in_container_env(example) }
+
+      it "sets logger_instance and $container_log to debug" do
+        log = described_class.send(:create_multicast_logger, log_file)
+
+        expect(log.loggers.first.level).to     eq(Logger::DEBUG)
+        expect(log.loggers.to_a.last.level).to eq(Logger::DEBUG)
+      end
+    end
+  end
+
+  describe "#apply_config_value (private)" do
+    it "will update the main lower level logger instance" do
+      log = described_class.send(:create_multicast_logger, log_file)
+      described_class.send(:apply_config_value, {:foo => :info}, log, :foo)
+
+      expect(log.loggers.first.level).to eq(Logger::INFO)
+      expect(log.loggers.to_a.size).to   eq(1)
+    end
+
+    context "in a container environment" do
+      around { |example| in_container_env(example) }
+
+      it "will always keep $container_log as DEBUG" do
+        log = described_class.send(:create_multicast_logger, log_file)
+        described_class.send(:apply_config_value, {:foo => :info}, log, :foo)
+
+        expect(log.loggers.first.level).to     eq(Logger::INFO)
+        expect(log.loggers.to_a.last.level).to eq(Logger::DEBUG)
+      end
+    end
+  end
+end