WIP: Test gzip support in RESTEasy Reactive

extensions/resteasy-reactive/quarkus-resteasy-reactive/deployment/src/test/java/io/quarkus/resteasy/reactive/GZipTest.java

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+package io.quarkus.resteasy.reactive;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import java.io.IOException;
+import java.util.function.Supplier;
+
+import javax.imageio.ImageIO;
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+
+import org.hamcrest.Matchers;
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.asset.StringAsset;
+import org.jboss.shrinkwrap.api.spec.JavaArchive;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+import io.quarkus.test.QuarkusUnitTest;
+import io.restassured.RestAssured;
+
+public class GZipTest {
+
+    private static final String APP_PROPS = "" +
+            "quarkus.http.enable-compression=true\n";
+
+    static String longString;
+    static {
+
+        StringBuilder sb = new StringBuilder();
+        for (int i = 0; i < 1000; ++i) {
+            sb.append("Hello RESTEasy Reactive;");
+        }
+        longString = sb.toString();
+    }
+
+    @RegisterExtension
+    static final QuarkusUnitTest test = new QuarkusUnitTest()
+            .setArchiveProducer(new Supplier<JavaArchive>() {
+                @Override
+                public JavaArchive get() {
+                    return ShrinkWrap.create(JavaArchive.class)
+                            .addAsResource(new StringAsset(APP_PROPS), "application.properties")
+                            .addClasses(TestCompression.class);
+                }
+            });
+
+    @Test
+    public void testServerCompression() throws Exception {
+
+        RestAssured.given().get("/test/compression").then().statusCode(200)
+                .header("content-encoding", "gzip")
+                .header("content-length", Matchers.not(Matchers.equalTo(Integer.toString(longString.length()))))
+                .body(Matchers.equalTo(longString));
+
+        RestAssured.given().get("/test/nocompression").then().statusCode(200)
+                .header("content-encoding", "identity")
+                .header("content-length", Matchers.equalTo((long) (createImage().getData().getDataBuffer().getSize() * 4L)))
+                .body(Matchers.equalTo(createImage()));
+    }
+
+    @Path("/test")
+    public static class TestCompression {
+
+        @Path("/compression")
+        @GET
+        public String registerCompression() {
+            return longString;
+        }
+
+        @Path("/nocompression")
+        @GET
+        public BufferedImage registerNoCompression() throws IOException {
+            BufferedImage image = createImage();
+            return image;
+        }
+    }
+
+    public static BufferedImage createImage() throws IOException {
+        int width = 300;
+        int height = 300;
+
+        BufferedImage bufferedImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        // Create a graphics which can be used to draw into the buffered image
+        Graphics2D graphic = bufferedImage.createGraphics();
+        // fill all the image with white
+        graphic.setColor(Color.white);
+        graphic.fillRect(0, 0, width, height);
+
+        // create a circle with black
+        graphic.setColor(Color.black);
+        graphic.fillOval(0, 0, width, height);
+
+        // create a string with yellow
+        graphic.setColor(Color.yellow);
+        graphic.drawString("Quarkus RESTEasy Reactive", 50, 120);
+        graphic.dispose();
+
+        // Save as PNG
+        File file = new File("src/test/resources/imageForTest.png");
+        ImageIO.write(bufferedImage, "png", file);
+        return bufferedImage;
+    }
+}