More precise mapping for WebSocket handshake requests

Closes gh-26565

spring-websocket/src/test/java/org/springframework/web/socket/server/support/WebSocketHandlerMappingTests.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2002-2021 the original author or authors.
+ *
+ * Licensed 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 org.springframework.web.socket.server.support;
+
+import java.util.Collections;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.web.HttpRequestHandler;
+import org.springframework.web.context.support.StaticWebApplicationContext;
+import org.springframework.web.servlet.HandlerExecutionChain;
+import org.springframework.web.socket.WebSocketHandler;
+import org.springframework.web.testfixture.servlet.MockHttpServletRequest;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Unit tests for {@link WebSocketHandlerMapping}.
+ *
+ * @author Rossen Stoyanchev
+ */
+public class WebSocketHandlerMappingTests {
+
+
+	@Test
+	void webSocketHandshakeMatch() throws Exception {
+		HttpRequestHandler handler = new WebSocketHttpRequestHandler(mock(WebSocketHandler.class));
+
+		WebSocketHandlerMapping mapping = new WebSocketHandlerMapping();
+		mapping.setUrlMap(Collections.singletonMap("/path", handler));
+		mapping.setApplicationContext(new StaticWebApplicationContext());
+
+		MockHttpServletRequest request = new MockHttpServletRequest("GET", "/path");
+
+		HandlerExecutionChain chain = mapping.getHandler(request);
+		assertThat(chain).isNotNull();
+		assertThat(chain.getHandler()).isSameAs(handler);
+
+		mapping.setWebSocketUpgradeMatch(true);
+
+		chain = mapping.getHandler(request);
+		assertThat(chain).isNull();
+
+		request.addHeader("Upgrade", "websocket");
+
+		chain = mapping.getHandler(request);
+		assertThat(chain).isNotNull();
+		assertThat(chain.getHandler()).isSameAs(handler);
+
+		request.setMethod("POST");
+
+		chain = mapping.getHandler(request);
+		assertThat(chain).isNull();
+	}
+
+}