test log formater

app/config/config_test.yml

@@ -18,6 +18,11 @@ web_profiler:
 swiftmailer:
     disable_delivery: true
 
+services:
+    backtrace_formatter:
+      class:  Monolog\Formatter\LineFormatter
+      methods: { includeStacktraces: [true] }
+
 monolog:
     handlers:
         main:
@@ -25,6 +30,8 @@ monolog:
             path: "%kernel.logs_dir%/%kernel.environment%.log"
             level: debug
             channels: [!event]
+            formatter : backtrace_formatter
+
         console:
             type:   console
             channels: [!event, !doctrine]