[issue-713] - Add a test to the TCKs in order to verify the usage of the "@ExternalDocumentation" annotation

tck/src/main/java/org/eclipse/microprofile/openapi/apps/scanconfig/a/AResource.java

@@ -17,11 +17,16 @@
 
 import jakarta.ws.rs.GET;
 import jakarta.ws.rs.Path;
+import org.eclipse.microprofile.openapi.annotations.ExternalDocumentation;
 
 @Path("a")
+@ExternalDocumentation(description = "Find more information about this application",
+        url = "https://github.com/microprofile/microprofile-open-api/blob/main/tck/src/main/java/org/eclipse/microprofile/openapi/apps/scanconfig/ScanConfigApplication.java")
 public class AResource {
 
     @GET
+    @ExternalDocumentation(description = "Find more information about this application resource",
+            url = "https://github.com/microprofile/microprofile-open-api/blob/main/tck/src/main/java/org/eclipse/microprofile/openapi/apps/scanconfig/a/AResource.java")
     public String get() {
         return "a";
     }

tck/src/main/java/org/eclipse/microprofile/openapi/tck/ExternalDocumentationAnnotationTest.java

@@ -0,0 +1,37 @@
+package org.eclipse.microprofile.openapi.tck;
+
+import io.restassured.response.ValidatableResponse;
+import org.eclipse.microprofile.openapi.apps.scanconfig.ScanConfigApplication;
+import org.eclipse.microprofile.openapi.apps.scanconfig.a.AResource;
+import org.jboss.arquillian.container.test.api.Deployment;
+import org.jboss.shrinkwrap.api.ShrinkWrap;
+import org.jboss.shrinkwrap.api.spec.WebArchive;
+import org.testng.annotations.Test;
+
+import static org.hamcrest.Matchers.equalTo;
+
+/**
+ * Verify usage of the {@code @ExternalDocumentation} annotation.
+ */
+public class ExternalDocumentationAnnotationTest extends AppTestBase {
+
+    @Deployment(name = "externalDocs-test", testable = false)
+    public static WebArchive deployment() {
+        return ShrinkWrap.create(WebArchive.class, "externalDocs-test.war")
+                .addClasses(ScanConfigApplication.class, AResource.class);
+    }
+
+    /**
+     * Check that the {@code externalDocs} element is present in the generated OpenAPI document when the
+     * {@code @ExternalDocumentation} annotation is used on a resource method definition.
+     * @param type Type of the OpenAPI output format
+     */
+    @Test(dataProvider = "formatProvider")
+    public void testExternalDocumentationAnnotationOnMethod(String type) {
+        ValidatableResponse vr = callEndpoint(type);
+
+        vr.body("paths.'/a'.externalDocs.description", equalTo("Find more information about this application resource"));
+        vr.body("paths.'/a'.externalDocs.url", equalTo(
+                "https://github.com/microprofile/microprofile-open-api/blob/main/tck/src/main/java/org/eclipse/microprofile/openapi/apps/scanconfig/a/AResource.java"));
+    }
+}