Add WebFlux with Undertow tests

framework/webflux-undertow/README.adoc

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+Tests if WebFlux with Undertow is working.

framework/webflux-undertow/build.gradle

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+plugins {
+	id "java"
+	id "org.springframework.boot"
+	id "org.springframework.cr.smoke-test"
+}
+
+dependencies {
+	implementation(platform(org.springframework.boot.gradle.plugin.SpringBootPlugin.BOM_COORDINATES))
+	implementation("org.springframework.boot:spring-boot-starter-webflux")
+	implementation("org.springframework.boot:spring-boot-starter-undertow")
+	modules {
+		module("org.springframework.boot:spring-boot-starter-reactor-netty") {
+			replacedBy("org.springframework.boot:spring-boot-starter-undertow", "Use Undertow instead of Netty")
+		}
+	}
+	implementation("org.crac:crac:$cracVersion")
+	implementation(project(":cr-listener"))
+
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+
+	appTestImplementation(project(":cr-smoke-test-support"))
+}
+
+crSmokeTest {
+	webApplication = true
+}

framework/webflux-undertow/src/appTest/java/com/example/webflux/WebfluxApplicationTests.java

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+package com.example.webflux;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.cr.smoketest.support.junit.ApplicationTest;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+@ApplicationTest
+class WebfluxApplicationTests {
+
+	@Test
+	void stringResponseBody(WebTestClient client) {
+		client.get()
+			.exchange()
+			.expectStatus()
+			.isOk()
+			.expectBody()
+			.consumeWith((result) -> assertThat(new String(result.getResponseBodyContent()))
+				.isEqualTo("Hello from Spring WebFlux and Undertow"));
+	}
+
+	@Test
+	void resourceInStatic(WebTestClient client) {
+		client.get()
+			.uri("foo.html")
+			.exchange()
+			.expectStatus()
+			.isOk()
+			.expectBody()
+			.consumeWith((result) -> assertThat(new String(result.getResponseBodyContent())).isEqualTo("Foo"));
+	}
+
+}

framework/webflux-undertow/src/main/java/com/example/webflux/WebfluxApplication.java

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+package com.example.webflux;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class WebfluxApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(WebfluxApplication.class, args);
+	}
+
+}

framework/webflux-undertow/src/main/java/com/example/webflux/WebfluxController.java

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+package com.example.webflux;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class WebfluxController {
+
+	@GetMapping("/")
+	public String hello() {
+		return "Hello from Spring WebFlux and Undertow";
+	}
+
+}

framework/webflux-undertow/src/main/resources/static/foo.html

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+Foo

framework/webflux-undertow/src/test/java/com/example/webflux/test/RandomPortTests.java

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+package com.example.webflux.test;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+import org.springframework.test.web.reactive.server.WebTestClient;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.boot.test.context.SpringBootTest.WebEnvironment.RANDOM_PORT;
+
+@SpringBootTest(webEnvironment = RANDOM_PORT)
+public class RandomPortTests {
+
+	@LocalServerPort
+	int port;
+
+	@Test
+	void check() {
+		assertThat(this.port).isNotZero();
+	}
+
+	@Test
+	void webClientWorks(@Autowired WebTestClient webClient) {
+		webClient.get()
+			.uri("/")
+			.exchange()
+			.expectStatus()
+			.isOk()
+			.expectBody(String.class)
+			.isEqualTo("Hello from Spring WebFlux and Undertow");
+	}
+
+}