Add Spring @Conditional annotation (SpringBootCondition) to enable/disable Spring bean configuration based on missing properties.

spring-geode-autoconfigure/src/test/java/org/springframework/geode/boot/autoconfigure/condition/ConditionalOnMissingPropertyIntegrationTests.java

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+/*
+ * Copyright 2018 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.geode.boot.autoconfigure.condition;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.Collections;
+import java.util.function.Function;
+
+import org.junit.Test;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.gemfire.tests.integration.SpringBootApplicationIntegrationTestsSupport;
+
+/**
+ * The ConditionalOnMissingPropertyIntegrationTests class...
+ *
+ * @author John Blum
+ * @since 1.0.0
+ */
+@SuppressWarnings("unused")
+public class ConditionalOnMissingPropertyIntegrationTests extends SpringBootApplicationIntegrationTestsSupport {
+
+	private Function<SpringApplicationBuilder, SpringApplicationBuilder> springApplicationBuilderFunction =
+		Function.identity();
+
+	private Function<SpringApplicationBuilder, SpringApplicationBuilder> allMatchingPropertiesFunction = builder -> {
+		builder.properties(Collections.singletonMap("example.app.config.propOne", ""));
+		builder.properties(Collections.singletonMap("example.app.config.propTwo", "test"));
+		return builder;
+	};
+
+	private Function<SpringApplicationBuilder, SpringApplicationBuilder> nonMatchingPropertyFunction = builder -> {
+		builder.properties(Collections.singletonMap("example.app.cfg.propertyOne", ""));
+		return builder;
+	};
+
+	private Function<SpringApplicationBuilder, SpringApplicationBuilder> singleMatchingPropertyFunction = builder -> {
+		builder.properties(Collections.singletonMap("example.app.config.propTwo", "test"));
+		return builder;
+	};
+
+	@Override
+	protected SpringApplicationBuilder processBeforeBuild(SpringApplicationBuilder springApplicationBuilder) {
+		return this.springApplicationBuilderFunction.apply(springApplicationBuilder);
+	}
+
+	private void assertBeanDefinitions(ApplicationContext applicationContext, boolean conditionalBeanExists) {
+
+		assertThat(applicationContext.containsBean("conditionalBean")).isEqualTo(conditionalBeanExists);
+		assertThat(applicationContext.containsBean("unconditionalBean")).isTrue();
+	}
+
+	@Test
+	public void allBeansExist() {
+		assertBeanDefinitions(newApplicationContext(TestConfiguration.class), true);
+	}
+
+	@Test
+	public void allBeansExistWithNonMatchingProperties() {
+
+		this.springApplicationBuilderFunction = this.nonMatchingPropertyFunction;
+
+		assertBeanDefinitions(newApplicationContext(TestConfiguration.class), true);
+	}
+
+	@Test
+	public void unconditionalBeanExistsWithAllMatchingProperties() {
+
+		this.springApplicationBuilderFunction = this.allMatchingPropertiesFunction;
+
+		assertBeanDefinitions(newApplicationContext(TestConfiguration.class), false);
+	}
+
+	@Test
+	public void unconditionalBeanExistsWithSingleMatchingProperty() {
+
+		this.springApplicationBuilderFunction = this.singleMatchingPropertyFunction;
+
+		assertBeanDefinitions(newApplicationContext(TestConfiguration.class), false);
+	}
+
+	@Configuration
+	static class TestConfiguration {
+
+		@Bean
+		@ConditionalOnMissingProperty(prefix = "example.app.config", name = { "propOne", "propTwo" })
+		Object conditionalBean() {
+			return "conditional";
+		}
+
+		@Bean
+		Object unconditionalBean() {
+			return "unconditional";
+		}
+	}
+}