Force to use freach Log4j configuration on each test, in particaular when it closes the logger context

Author: andsel

logstash-core/spec/logstash/runner_spec.rb

@@ -263,8 +263,6 @@
         let(:runner_deprecation_logger_stub) { double("DeprecationLogger(Runner)").as_null_object }
         before(:each) { allow(runner).to receive(:deprecation_logger).and_return(runner_deprecation_logger_stub) }
 
-        let(:configuration_spy) { configure_log_spy }
-
         def configure_log_spy
           java_import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory
           java_import org.apache.logging.log4j.Level
@@ -308,7 +306,10 @@ def configure_log_spy
 
             subject.run("bin/logstash", args)
 
+            expect(appender_spy.messages).not_to be_empty
             expect(appender_spy.messages[0]).to match(/`http.host` is a deprecated alias for `api.http.host`/)
+
+            log_ctx.close
           end
         end
 

logstash-core/spec/logstash/settings/setting_with_deprecated_alias_spec.rb

@@ -27,22 +27,34 @@
   let(:settings) { LogStash::Settings.new }
   let(:canonical_setting) { LogStash::Setting::StringSetting.new(canonical_setting_name, default_value, true) }
 
-  let(:log_ctx) { setup_logger_spy }
-  let(:log_spy) { retrieve_logger_spy(log_ctx) }
+  log_spy = nil
+  log_ctx = nil
 
-  before(:each) do
-    # Initialization of appender and logger use to spy, need to be done before executing any code that logs,
-    # that's the reason wy to refer the spying logger context before any test.
-    log_ctx
+  def log_ctx
+    @log_ctx
+  end
+
+  def log_spy
+    @log_spy
   end
 
   before(:each) do
+    # Initialization of appender and logger use to spy, need to be freshly recreated on each test is context shutdown is used.
+    @log_ctx = setup_logger_spy
+    @log_spy = retrieve_logger_spy(@log_ctx)
+
     allow(LogStash::Settings).to receive(:logger).and_return(double("SettingsLogger").as_null_object)
     allow(LogStash::Settings).to receive(:deprecation_logger).and_return(double("SettingsDeprecationLogger").as_null_object)
 
     settings.register(canonical_setting.with_deprecated_alias(deprecated_setting_name))
   end
 
+  after(:each) do
+    @log_ctx.close
+    @log_spy = nil
+    @log_ctx = nil
+  end
+
   shared_examples '#validate_value success' do
     context '#validate_value' do
       it "returns without raising" do

spec/spec_helper.rb

@@ -93,21 +93,6 @@ def installed_plugins
 
 
 def setup_logger_spy
-  java_import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory
-  java_import org.apache.logging.log4j.Level
-  config_builder = ConfigurationBuilderFactory.newConfigurationBuilder
-  configure_log_spy = config_builder
-                        .add(
-                          config_builder
-                            .newAppender("LOG_SPY", "List")
-                            .add(config_builder.newLayout("PatternLayout").addAttribute("pattern", "%-5p [%t]: %m%n"))
-                        )
-                        .add(
-                          config_builder
-                            .newRootLogger(Level::INFO)
-                            .add(config_builder.newAppenderRef("LOG_SPY")))
-                        .build(false)
-
   java_import org.apache.logging.log4j.core.config.Configurator
   java_import org.apache.logging.log4j.core.config.Configuration
 
@@ -121,7 +106,25 @@ def setup_logger_spy
   expect(log_ctx).not_to be nil
   log_ctx.reconfigure(configure_log_spy) # force the programmatic configuration, without this it's not used
 
-  return log_ctx
+  log_ctx
+end
+
+def configure_log_spy
+  java_import org.apache.logging.log4j.core.config.builder.api.ConfigurationBuilderFactory
+  java_import org.apache.logging.log4j.Level
+  config_builder = ConfigurationBuilderFactory.newConfigurationBuilder
+  configuration = config_builder
+                        .add(
+                          config_builder
+                            .newAppender("LOG_SPY", "List")
+                            .add(config_builder.newLayout("PatternLayout").addAttribute("pattern", "%-5p [%t]: %m%n"))
+                        )
+                        .add(
+                          config_builder
+                            .newRootLogger(Level::INFO)
+                            .add(config_builder.newAppenderRef("LOG_SPY")))
+                        .build(false)
+  configuration
 end
 
 def retrieve_logger_spy(log_ctx)