Fix incorrect severity field.

lib/unicorn/unicorn_json_log_formatter.rb

@@ -3,7 +3,8 @@ require 'json'
 class UnicornJSONLogFormatter < Logger::Formatter
   def call(severity, datetime, progname, message)
     default = {
-      severity: severity,
+      severity: "Logger::Severity::#{severity}".constantize,
+      severity_name: severity,
       datetime: DateTime.parse(datetime.to_s).to_s,
       progname: progname || '',
       pid: $$,

spec/components/unicorn/unicorn_json_log_formatter_spec.rb

@@ -11,7 +11,7 @@ RSpec.describe UnicornJSONLogFormatter do
           error = e
 
           output = described_class.new.call(
-            'INFO',
+            'ERROR',
             Time.zone.now,
             '',
             e
@@ -20,7 +20,8 @@ RSpec.describe UnicornJSONLogFormatter do
 
         output = JSON.parse(output)
 
-        expect(output["severity"]).to eq('INFO')
+        expect(output["severity"]).to eq(3)
+        expect(output["severity_name"]).to eq("ERROR")
         expect(output["datetime"]).to be_present
         expect(output["progname"]).to eq('')
         expect(output["pid"]).to be_present