Add test case for reproducing a windows path parsing issue

Author: travkin79

org.eclipse.lsp4e.test/src/org/eclipse/lsp4e/test/operations/symbols/SymbolIconProviderRegistryTest.java

@@ -0,0 +1,56 @@
+/*******************************************************************************
+ * Copyright (c) 2026 Advantest GmbH and others.
+ * This program and the accompanying materials are made
+ * available under the terms of the Eclipse Public License 2.0
+ * which is available at https://www.eclipse.org/legal/epl-2.0/
+ *
+ * SPDX-License-Identifier: EPL-2.0
+ *
+ * Contributors:
+ *  Dietrich Travkin (Solunar GmbH) - initial implementation
+ *******************************************************************************/
+package org.eclipse.lsp4e.test.operations.symbols;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+import java.lang.reflect.Method;
+import java.net.URI;
+
+import org.eclipse.lsp4e.operations.symbols.internal.SymbolIconProviderRegistry;
+import org.eclipse.lsp4e.outline.SymbolsModel.DocumentSymbolWithURI;
+import org.eclipse.lsp4e.ui.SymbolIconProvider;
+import org.eclipse.lsp4j.DocumentSymbol;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.CsvSource;
+
+public class SymbolIconProviderRegistryTest {
+
+	@ParameterizedTest
+	@CsvSource({
+		"file:///C:/Users/username/path/to/SomeDir/SomeType.hpp, SomeType.hpp",
+		"file:///home/username/path/to/SomeDir/SomeType.hpp, SomeType.hpp",
+		"file://C:/Users/username/path/to/SomeDir/SomeType.hpp, SomeType.hpp",
+		"file://home/username/path/to/SomeDir/SomeType.hpp, SomeType.hpp"
+	})
+	public void testReadingFileNameFromUri(String uriText, String expectedFileName) throws Exception {
+		URI uri = URI.create(uriText);
+
+		// Call the private getFileName(URI) method via reflection to verify it does
+		// not throw any exception and returns the correct file name.
+		Method getInstance = SymbolIconProviderRegistry.class.getDeclaredMethod("get");
+		getInstance.setAccessible(true);
+		Object registry = getInstance.invoke(null);
+
+		Method getFileName = SymbolIconProviderRegistry.class.getDeclaredMethod("getFileName", URI.class);
+		getFileName.setAccessible(true);
+		String actualFileName = (String) getFileName.invoke(registry, uri);
+		assertEquals(expectedFileName, actualFileName);
+
+		// Also verify that the registry itself handles the URI without exceptions
+		// and returns a non-null provider.
+		DocumentSymbolWithURI symbol = new DocumentSymbolWithURI(new DocumentSymbol(), uri);
+		SymbolIconProvider provider = SymbolIconProviderRegistry.getSymbolIconProviderFor(symbol);
+		assertNotNull(provider);
+	}
+
+}