Add inprocess factories and a test

samples/grpc-server/src/test/java/org/springframework/grpc/sample/GrpcServerIntegrationTests.java

@@ -18,23 +18,32 @@ package org.springframework.grpc.sample;
 
 import static org.assertj.core.api.Assertions.assertThat;
 
+import java.util.List;
+
 import org.junit.jupiter.api.Nested;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.EnabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
 import org.springframework.grpc.autoconfigure.server.GrpcServerProperties;
 import org.springframework.grpc.client.GrpcChannelFactory;
 import org.springframework.grpc.sample.proto.HelloReply;
 import org.springframework.grpc.sample.proto.HelloRequest;
 import org.springframework.grpc.sample.proto.SimpleGrpc;
 import org.springframework.grpc.server.GrpcServerFactory;
+import org.springframework.grpc.server.ServerBuilderCustomizer;
+import org.springframework.grpc.server.service.GrpcServiceDiscoverer;
+import org.springframework.grpc.test.InProcessGrpcChannelFactory;
+import org.springframework.grpc.test.InProcessGrpcServerFactory;
 import org.springframework.grpc.test.LocalGrpcPort;
 import org.springframework.test.annotation.DirtiesContext;
 import org.springframework.test.context.ActiveProfiles;
 
 import io.grpc.ManagedChannel;
+import io.grpc.inprocess.InProcessServerBuilder;
 
 /**
  * More detailed integration tests for {@link GrpcServerFactory gRPC server factories} and
@@ -42,6 +51,37 @@ import io.grpc.ManagedChannel;
  */
 class GrpcServerIntegrationTests {
 
+	@Nested
+	@SpringBootTest
+	class ServerWithInProcessChannel {
+
+		@Test
+		void servesResponseToClient(@Autowired GrpcChannelFactory channels) {
+			assertThatResponseIsServedToChannel(channels.createChannel("0.0.0.0:0").build());
+		}
+
+		@TestConfiguration
+		static class InProcessConfiguration {
+
+			@Bean
+			InProcessGrpcServerFactory grpcServerFactory(GrpcServiceDiscoverer grpcServicesDiscoverer,
+					List<ServerBuilderCustomizer<InProcessServerBuilder>> customizers) {
+				InProcessGrpcServerFactory factory = new InProcessGrpcServerFactory("0.0.0.0:0", customizers);
+				grpcServicesDiscoverer.findServices().forEach(factory::addService);
+				return factory;
+			}
+
+			@Bean
+			InProcessGrpcChannelFactory grpcChannelFactory() {
+				InProcessGrpcChannelFactory factory = new InProcessGrpcChannelFactory();
+				factory.setVirtualTargets(path -> path);
+				return factory;
+			}
+
+		}
+
+	}
+
 	@Nested
 	@SpringBootTest(properties = { "spring.grpc.server.host=0.0.0.0", "spring.grpc.server.port=0" })
 	class ServerWithAnyIPv4AddressAndRandomPort {