Add a new spring-boot-sample-test application

Add a sample application that demonstrates recently added testing
features.

See gh-4901

spring-boot-samples/spring-boot-sample-test/src/main/java/sample/test/domain/User.java

@@ -0,0 +1,65 @@
+/*
+ * Copyright 2012-2016 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.test.domain;
+
+import javax.persistence.Column;
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.Id;
+
+import org.springframework.util.Assert;
+
+/**
+ * A user of the system.
+ *
+ * @author Phillip Webb
+ */
+@Entity
+public class User {
+
+	@Id
+	@GeneratedValue
+	private Long id;
+
+	@Column(unique = true)
+	private String username;
+
+	private VehicleIdentificationNumber vin;
+
+	protected User() {
+	}
+
+	public User(String username, VehicleIdentificationNumber vin) {
+		Assert.hasLength(username, "Username must not be empty");
+		Assert.notNull(vin, "VIN must not be null");
+		this.username = username;
+		this.vin = vin;
+	}
+
+	protected Long getId() {
+		return this.id;
+	}
+
+	public String getUsername() {
+		return this.username;
+	}
+
+	public VehicleIdentificationNumber getVin() {
+		return this.vin;
+	}
+
+}