Add auto configuration support for Spring Data Solr

Registers required components in application context if not available to
set up environment for usage with Spring Data Solr. Will listen on
SolrServer and SolrRepositories for configuration.

By default an HttpSolrServer is registered unless a zkHost (zookeeper
host) is defined. In that case an instance of CloudSolrServer will be
created.

By default multicore support is enabled, creating instances of
SolrServer for each core defined via @SolrDocument.

spring-boot-samples/spring-boot-sample-data-solr/src/test/java/sample/data/solr/SampleSolrApplicationTests.java

@@ -0,0 +1,62 @@
+/*
+ * Copyright 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 sample.data.solr;
+
+import static org.junit.Assert.*;
+
+import org.apache.solr.client.solrj.SolrServerException;
+import org.junit.Rule;
+import org.junit.Test;
+import org.springframework.boot.test.OutputCapture;
+import org.springframework.core.NestedCheckedException;
+
+/**
+ * @author Christoph Strobl
+ */
+public class SampleSolrApplicationTests {
+
+	@Rule
+	public OutputCapture outputCapture = new OutputCapture();
+
+	@Test
+	public void testDefaultSettings() throws Exception {
+
+		try {
+			SampleSolrApplication.main(new String[0]);
+		} catch (IllegalStateException ex) {
+			if (serverNotRunning(ex)) {
+				return;
+			}
+		}
+		String output = this.outputCapture.toString();
+		assertTrue("Wrong output: " + output, output.contains("name=Sony Playstation"));
+	}
+
+	private boolean serverNotRunning(IllegalStateException ex) {
+
+		@SuppressWarnings("serial")
+		NestedCheckedException nested = new NestedCheckedException("failed", ex) {
+		};
+		if (nested.contains(SolrServerException.class)) {
+			Throwable root = nested.getRootCause();
+			if (root.getMessage().contains("Connection refused")) {
+				return true;
+			}
+		}
+		return false;
+	}
+}