expose build

core/src/main/java/com/linecorp/armeria/server/cors/AbstractCorsPolicyBuilder.java

@@ -437,7 +437,7 @@ public SELF disablePreflightResponseHeaders() {
     /**
      * Returns a newly-created {@link CorsPolicy} based on the properties of this builder.
      */
-    CorsPolicy build() {
+    public final CorsPolicy build() {
         return new CorsPolicy(origins, originPredicate, routes, credentialsAllowed, maxAge,
                               nullOriginAllowed, exposedHeaders, allowAllRequestHeaders, allowedRequestHeaders,
                               allowedRequestMethods, preflightResponseHeadersDisabled,

core/src/test/java/com/linecorp/armeria/server/cors/test/CorsBuilderTest.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2025 LINE Corporation
+ *
+ * LINE Corporation licenses this file to you 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 com.linecorp.armeria.server.cors.test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+
+import com.linecorp.armeria.common.HttpMethod;
+import com.linecorp.armeria.server.cors.CorsPolicy;
+import com.linecorp.armeria.server.cors.CorsPolicyBuilder;
+
+class CorsBuilderTest {
+
+    @Test
+    void buildCorsPolicy() {
+        final String url = "http://example.com";
+        final CorsPolicyBuilder cb = CorsPolicy.builder(url);
+        cb.allowRequestMethods(HttpMethod.POST, HttpMethod.GET)
+          .allowRequestHeaders("allow_request_header")
+          .exposeHeaders("expose_header_1", "expose_header_2")
+          .preflightResponseHeader("x-preflight-cors", "Hello CORS");
+        final CorsPolicy policy = cb.build();
+        assertThat(policy.originPredicate().test(url)).isTrue();
+    }
+}