Add Atomikos and Bitronix JTA samples

Add samples and integration tests for Atomikos and Bitronix JTA.

See gh-947

spring-boot-samples/spring-boot-sample-jta-atomikos/src/test/java/sample/atomikos/SampleAtomikosApplicationTests.java

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+/*
+ * 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 sample.atomikos;
+
+import org.hamcrest.Matcher;
+import org.hamcrest.core.SubstringMatcher;
+import org.junit.Rule;
+import org.junit.Test;
+import org.springframework.boot.test.OutputCapture;
+
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Basic integration tests for demo application.
+ *
+ * @author Phillip Webb
+ */
+public class SampleAtomikosApplicationTests {
+
+	@Rule
+	public OutputCapture outputCapture = new OutputCapture();
+
+	@Test
+	public void testTransactionRollback() throws Exception {
+		SampleAtomikosApplication.main(new String[] {});
+		String expected = "";
+		expected += "----> josh\n";
+		expected += "Count is 1\n";
+		expected += "Simulated error\n";
+		expected += "Count is 1\n";
+		assertThat(this.outputCapture.toString(), containsString(expected));
+		assertThat(this.outputCapture.toString(), containsStringOnce("---->"));
+	}
+
+	private Matcher<? super String> containsStringOnce(String s) {
+		return new SubstringMatcher(s) {
+
+			@Override
+			protected String relationship() {
+				return "containing once";
+			}
+
+			@Override
+			protected boolean evalSubstringOf(String s) {
+				int i = 0;
+				while (s.contains(this.substring)) {
+					s = s.substring(s.indexOf(this.substring) + this.substring.length());
+					i++;
+				}
+				return i == 1;
+			}
+
+		};
+	}
+
+}