Add ignored test to show that blitz4j is not responding

Blitz4j is definitely preventing the log levels from being changed at runtime
through the normal Spring boot channels.

Fixes gh-48

spring-cloud-netflix-eureka-server/src/test/java/org/springframework/cloud/netflix/eureka/server/Log4JLoggingSystemTests.java

@@ -0,0 +1,81 @@
+/*
+ * Copyright 2012-2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.cloud.netflix.eureka.server;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.junit.Assert.assertThat;
+
+import java.io.IOException;
+
+import org.apache.log4j.Logger;
+import org.junit.Before;
+import org.junit.Ignore;
+import org.junit.Rule;
+import org.junit.Test;
+import org.springframework.boot.logging.LogLevel;
+import org.springframework.boot.logging.log4j.Log4JLoggingSystem;
+import org.springframework.boot.test.OutputCapture;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.util.ClassUtils;
+import org.springframework.util.StringUtils;
+
+import com.netflix.blitz4j.LoggingConfiguration;
+
+/**
+ * Tests for {@link Log4JLoggingSystem}.
+ *
+ * @author Phillip Webb
+ */
+public class Log4JLoggingSystemTests {
+
+	@Rule
+	public OutputCapture output = new OutputCapture();
+
+	private final Log4JLoggingSystem loggingSystem = new Log4JLoggingSystem(getClass()
+			.getClassLoader());
+
+	private Logger logger;
+
+	@Before
+	public void setup() {
+		System.setProperty("log4j.configuration", getPackagedConfigFile("log4j.properties"));
+		logger = Logger.getLogger(getClass());
+		LoggingConfiguration.getInstance().configure();
+	}
+
+	@Test
+	@Ignore("gh-48")
+	public void setLevel() throws Exception {
+		this.loggingSystem.beforeInitialize();
+		this.loggingSystem.initialize(null, null);
+		this.logger.debug("Hello");
+		this.loggingSystem.setLogLevel("org.springframework.cloud", LogLevel.DEBUG);
+		this.logger.debug("Hello");
+		assertThat(StringUtils.countOccurrencesOf(this.output.toString(), "Hello"),
+				equalTo(1));
+	}
+
+
+	private final String getPackagedConfigFile(String fileName) {
+		try {
+			return new ClassPathResource(fileName, Log4JLoggingSystem.class).getURL().toString();
+		}
+		catch (IOException e) {
+			throw new IllegalStateException("Cannot create URL", e);
+		}
+	}
+}