Polish "Allow AbstractUrlHandlerMapping to add/remote handlers"

See gh-32064

spring-webmvc/src/test/java/org/springframework/web/servlet/handler/AbstractUrlHandlerMappingTests.java

@@ -0,0 +1,143 @@
+/*
+ * Copyright 2002-2024 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.servlet.handler;
+
+import java.util.Map;
+import java.util.function.Consumer;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.context.support.StaticApplicationContext;
+import org.springframework.lang.Nullable;
+
+import static java.util.Map.entry;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatNoException;
+
+/**
+ * Tests for {@link AbstractUrlHandlerMapping}.
+ *
+ * @author Stephane Nicoll
+ */
+class AbstractUrlHandlerMappingTests {
+
+	private final AbstractUrlHandlerMapping mapping = new AbstractUrlHandlerMapping() {};
+
+	@Test
+	void registerRootHandler() {
+		TestController rootHandler = new TestController();
+		mapping.registerHandler("/", rootHandler);
+		assertThat(mapping).satisfies(hasMappings(rootHandler, null, Map.of()));
+	}
+
+	@Test
+	void registerDefaultHandler() {
+		TestController defaultHandler = new TestController();
+		mapping.registerHandler("/*", defaultHandler);
+		assertThat(mapping).satisfies(hasMappings(null, defaultHandler, Map.of()));
+	}
+
+	@Test
+	void registerSpecificMapping() {
+		TestController testHandler = new TestController();
+		mapping.registerHandler("/test", testHandler);
+		assertThat(mapping).satisfies(hasMappings(null, null, Map.of("/test", testHandler)));
+	}
+
+	@Test
+	void registerSpecificMappingWithBeanName() {
+		StaticApplicationContext context = new StaticApplicationContext();
+		context.registerSingleton("controller", TestController.class);
+		mapping.setApplicationContext(context);
+		mapping.registerHandler("/test", "controller");
+		assertThat(mapping.getHandlerMap().get("/test")).isSameAs(context.getBean("controller"));
+	}
+
+	@Test
+	void unregisterRootHandler() {
+		TestController rootHandler = new TestController();
+		TestController defaultHandler = new TestController();
+		TestController specificHandler = new TestController();
+		mapping.registerHandler("/", rootHandler);
+		mapping.registerHandler("/*", defaultHandler);
+		mapping.registerHandler("/test", specificHandler);
+		assertThat(mapping).satisfies(hasMappings(rootHandler, defaultHandler, Map.of("/test", specificHandler)));
+
+		mapping.unregisterHandler("/");
+		assertThat(mapping).satisfies(hasMappings(null, defaultHandler, Map.of("/test", specificHandler)));
+	}
+
+	@Test
+	void unregisterDefaultHandler() {
+		TestController rootHandler = new TestController();
+		TestController defaultHandler = new TestController();
+		TestController specificHandler = new TestController();
+		mapping.registerHandler("/", rootHandler);
+		mapping.registerHandler("/*", defaultHandler);
+		mapping.registerHandler("/test", specificHandler);
+		assertThat(mapping).satisfies(hasMappings(rootHandler, defaultHandler, Map.of("/test", specificHandler)));
+
+		mapping.unregisterHandler("/*");
+		assertThat(mapping).satisfies(hasMappings(rootHandler, null, Map.of("/test", specificHandler)));
+	}
+
+	@Test
+	void unregisterSpecificHandler() {
+		TestController rootHandler = new TestController();
+		TestController defaultHandler = new TestController();
+		TestController specificHandler = new TestController();
+		mapping.registerHandler("/", rootHandler);
+		mapping.registerHandler("/*", defaultHandler);
+		mapping.registerHandler("/test", specificHandler);
+		assertThat(mapping).satisfies(hasMappings(rootHandler, defaultHandler, Map.of("/test", specificHandler)));
+
+		mapping.unregisterHandler("/test");
+		assertThat(mapping).satisfies(hasMappings(rootHandler, defaultHandler, Map.of()));
+	}
+
+	@Test
+	void unregisterUnsetRootHandler() {
+		assertThatNoException().isThrownBy(() -> mapping.unregisterHandler("/"));
+	}
+
+	@Test
+	void unregisterUnsetDefaultHandler() {
+		assertThatNoException().isThrownBy(() -> mapping.unregisterHandler("/*"));
+	}
+
+	@Test
+	void unregisterUnknownHandler() {
+		TestController specificHandler = new TestController();
+		mapping.registerHandler("/test", specificHandler);
+
+		mapping.unregisterHandler("/test/*");
+		assertThat(mapping.getHandlerMap()).containsExactly(entry("/test", specificHandler));
+	}
+
+
+	private Consumer<AbstractUrlHandlerMapping> hasMappings(@Nullable Object rootHandler,
+			@Nullable Object defaultHandler, Map<String, Object> handlerMap) {
+		return actual -> {
+			assertThat(actual.getRootHandler()).isEqualTo(rootHandler);
+			assertThat(actual.getDefaultHandler()).isEqualTo(defaultHandler);
+			assertThat(actual.getHandlerMap()).containsExactlyEntriesOf(handlerMap);
+		};
+	}
+
+	private static class TestController {}
+
+}