Adds smoke tests for a Spring for Apache Geode project generated (created) with Spring Initializer at https://start.spring.io.

Resolves gh-51.

spring-geode-tests/smoke-tests/spring-initializer/src/main/java/example/app/InitializerApplication.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright 2019 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
+ *
+ *     https://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 example.app;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.apache.geode.cache.GemFireCache;
+import org.apache.geode.cache.Region;
+import org.apache.geode.cache.client.ClientRegionShortcut;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.WebApplicationType;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.gemfire.client.ClientRegionFactoryBean;
+import org.springframework.data.gemfire.config.annotation.EnableLogging;
+import org.springframework.web.context.WebApplicationContext;
+
+/**
+ * {@link SpringBootApplication Spring Boot application} generated from {@literal Spring Initializer}
+ * at <a href="https://start.spring.io">start.spring.io</a>.
+ *
+ * Putting data into and getting data out of an Apache Geode cache {@link Region} is the most basic function.
+ *
+ * @author John Blum
+ * @see org.apache.geode.cache.GemFireCache
+ * @see org.apache.geode.cache.Region
+ * @see org.springframework.boot.SpringApplication
+ * @see org.springframework.boot.WebApplicationType
+ * @see org.springframework.boot.autoconfigure.SpringBootApplication
+ * @see org.springframework.boot.builder.SpringApplicationBuilder
+ * @see org.springframework.context.ConfigurableApplicationContext
+ * @see org.springframework.context.annotation.Bean
+ * @see org.springframework.context.annotation.Configuration
+ * @see org.springframework.data.gemfire.client.ClientRegionFactoryBean
+ * @see org.springframework.data.gemfire.config.annotation.EnableLogging
+ * @see org.springframework.web.context.WebApplicationContext
+ * @since 1.2.0
+ */
+@SpringBootApplication
+@SuppressWarnings("unused")
+public class InitializerApplication {
+
+	public static void main(String[] args) {
+
+		SpringApplication springApplication =
+			new SpringApplicationBuilder(InitializerApplication.class) .build();
+
+		assertThat(springApplication).isNotNull();
+		assertThat(springApplication.getWebApplicationType()).isEqualTo(WebApplicationType.NONE);
+
+		ConfigurableApplicationContext applicationContext = springApplication.run(args);
+
+		assertThat(applicationContext).isNotNull();
+		assertThat(applicationContext).isNotInstanceOf(WebApplicationContext.class);
+		assertThat(springApplication.getWebApplicationType()).isNotEqualTo(WebApplicationType.SERVLET);
+	}
+
+	@Configuration
+	@EnableLogging(logLevel = "error")
+	static class GeodeConfiguration {
+
+		@Bean("Example")
+		public ClientRegionFactoryBean<Object, Object> exampleRegion(GemFireCache gemfireCache) {
+
+			ClientRegionFactoryBean<Object, Object> exampleRegion = new ClientRegionFactoryBean<>();
+
+			exampleRegion.setCache(gemfireCache);
+			exampleRegion.setShortcut(ClientRegionShortcut.LOCAL);
+
+			return exampleRegion;
+		}
+	}
+}