Add a test for autroconfig of servlet

Signed-off-by: Dave Syer <dsyer@vmware.com>

Author: Dave Syer

spring-grpc-spring-boot-autoconfigure/pom.xml

@@ -45,6 +45,11 @@
 			<version>${project.version}</version>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.springframework</groupId>
+			<artifactId>spring-web</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.apache.tomcat.embed</groupId>
 			<artifactId>tomcat-embed-core</artifactId>
@@ -86,4 +91,4 @@
 
 	</dependencies>
 
-</project>
+</project>

spring-grpc-spring-boot-autoconfigure/src/test/java/org/springframework/grpc/autoconfigure/server/GrpcServletAutoConfigurationTests.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright 2023-2024 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 org.springframework.grpc.autoconfigure.server;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.ArgumentMatchers.anyInt;
+import static org.mockito.Mockito.inOrder;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.time.Duration;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+
+import org.assertj.core.api.InstanceOfAssertFactories;
+import org.junit.jupiter.api.Test;
+import org.mockito.InOrder;
+import org.mockito.MockedStatic;
+import org.mockito.Mockito;
+import org.mockito.stubbing.Answer;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.ssl.SslAutoConfiguration;
+import org.springframework.boot.test.context.FilteredClassLoader;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.boot.test.context.runner.WebApplicationContextRunner;
+import org.springframework.boot.web.servlet.ServletRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.annotation.Order;
+import org.springframework.grpc.server.GrpcServerFactory;
+import org.springframework.grpc.server.NettyGrpcServerFactory;
+import org.springframework.grpc.server.ServerBuilderCustomizer;
+import org.springframework.grpc.server.ShadedNettyGrpcServerFactory;
+import org.springframework.grpc.server.lifecycle.GrpcServerLifecycle;
+
+import io.grpc.BindableService;
+import io.grpc.Grpc;
+import io.grpc.ServerBuilder;
+import io.grpc.ServerServiceDefinition;
+import io.grpc.ServiceDescriptor;
+import io.grpc.netty.NettyServerBuilder;
+
+/**
+ * Tests for {@link GrpcServerAutoConfiguration}.
+ *
+ * @author Chris Bono
+ */
+class GrpcServletAutoConfigurationTests {
+
+	private WebApplicationContextRunner contextRunner() {
+		BindableService service = mock();
+		ServerServiceDefinition serviceDefinition = ServerServiceDefinition.builder("my-service").build();
+		when(service.bindService()).thenReturn(serviceDefinition);
+		// NOTE: we use noop server lifecycle to avoid startup
+		return new WebApplicationContextRunner()
+			.withConfiguration(
+					AutoConfigurations.of(GrpcServerAutoConfiguration.class, GrpcServerFactoryAutoConfiguration.class))
+			.withBean(BindableService.class, () -> service);
+	}
+
+	@Test
+	void whenGrpcNotOnClasspathAutoConfigurationIsSkipped() {
+		this.contextRunner()
+			.withClassLoader(new FilteredClassLoader(BindableService.class))
+			.run((context) -> assertThat(context).doesNotHaveBean(GrpcServerAutoConfiguration.class)
+				.doesNotHaveBean(ServletRegistrationBean.class));
+	}
+
+	@Test
+	void whenNoBindableServicesRegisteredAutoConfigurationIsSkipped() {
+		new ApplicationContextRunner().withConfiguration(AutoConfigurations.of(GrpcServerAutoConfiguration.class))
+			.run((context) -> assertThat(context).doesNotHaveBean(GrpcServerAutoConfiguration.class)
+				.doesNotHaveBean(ServletRegistrationBean.class));
+	}
+
+	@Test
+	void whenWebApplicationServletIsAutoConfigured() {
+		this.contextRunner().run((context) -> assertThat(context).getBean(ServletRegistrationBean.class).isNotNull());
+	}
+
+}