Add test case for PathFilterGroup

This is needed to prepare for optimization.

Bug: 397185
Change-Id: If38507ef8cc5a161353cc07bf7cd1922f54d1f8a

org.eclipse.jgit.test/tst/org/eclipse/jgit/treewalk/filter/PathFilterGroupTest.java

@@ -0,0 +1,190 @@
+/*
+ * Copyright (C) 2013, Robin Rosenberg
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.treewalk.filter;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+
+import org.eclipse.jgit.dircache.DirCache;
+import org.eclipse.jgit.dircache.DirCacheEditor;
+import org.eclipse.jgit.dircache.DirCacheEntry;
+import org.eclipse.jgit.dircache.DirCacheIterator;
+import org.eclipse.jgit.errors.IncorrectObjectTypeException;
+import org.eclipse.jgit.errors.MissingObjectException;
+import org.eclipse.jgit.errors.StopWalkException;
+import org.eclipse.jgit.lib.FileMode;
+import org.eclipse.jgit.lib.ObjectReader;
+import org.eclipse.jgit.treewalk.TreeWalk;
+import org.junit.Before;
+import org.junit.Test;
+
+public class PathFilterGroupTest {
+
+	private TreeFilter filter;
+
+	@Before
+	public void setup() {
+		// @formatter:off
+		String[] paths = new String[] {
+				"/a", // never match
+				"/a/b", // never match
+				"a",
+				"b/c",
+				"c/d/e",
+				"c/d/f",
+				"d/e/f/g"
+				};
+		// @formatter:on
+		filter = PathFilterGroup.createFromStrings(paths);
+	}
+
+	@Test
+	public void testExact() throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		assertTrue(filter.include(fakeWalk("a")));
+		assertTrue(filter.include(fakeWalk("b/c")));
+		assertTrue(filter.include(fakeWalk("c/d/e")));
+		assertTrue(filter.include(fakeWalk("c/d/f")));
+		assertTrue(filter.include(fakeWalk("d/e/f/g")));
+	}
+
+	@Test
+	public void testNoMatchButClose() throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		assertFalse(filter.include(fakeWalk("a+")));
+		assertFalse(filter.include(fakeWalk("b+/c")));
+		assertFalse(filter.include(fakeWalk("c+/d/e")));
+		assertFalse(filter.include(fakeWalk("c+/d/f")));
+		assertFalse(filter.include(fakeWalk("c/d.a")));
+		assertFalse(filter.include(fakeWalk("d+/e/f/g")));
+	}
+
+	@Test
+	public void testJustCommonPrefixIsNotMatch() throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		assertFalse(filter.include(fakeWalk("b/a")));
+		assertFalse(filter.include(fakeWalk("b/d")));
+		assertFalse(filter.include(fakeWalk("c/d/a")));
+		assertFalse(filter.include(fakeWalk("d/e/e")));
+	}
+
+	@Test
+	public void testKeyIsPrefixOfFilter() throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		assertTrue(filter.include(fakeWalk("b")));
+		assertTrue(filter.include(fakeWalk("c/d")));
+		assertTrue(filter.include(fakeWalk("c/d")));
+		assertTrue(filter.include(fakeWalk("c")));
+		assertTrue(filter.include(fakeWalk("d/e/f")));
+		assertTrue(filter.include(fakeWalk("d/e")));
+		assertTrue(filter.include(fakeWalk("d")));
+	}
+
+	@Test
+	public void testFilterIsPrefixOfKey() throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		assertTrue(filter.include(fakeWalk("a/b")));
+		assertTrue(filter.include(fakeWalk("b/c/d")));
+		assertTrue(filter.include(fakeWalk("c/d/e/f")));
+		assertTrue(filter.include(fakeWalk("c/d/f/g")));
+		assertTrue(filter.include(fakeWalk("d/e/f/g/h")));
+	}
+
+	@Test
+	public void testStopWalk() throws MissingObjectException,
+			IncorrectObjectTypeException, IOException {
+		// Obvious
+		filter.include(fakeWalk("d/e/f/f"));
+
+		// Obvious
+		try {
+			filter.include(fakeWalk("de"));
+			fail("StopWalkException expected");
+		} catch (StopWalkException e) {
+			// good
+		}
+
+		// less obvious due to git sorting order
+		filter.include(fakeWalk("d."));
+
+		// less obvious due to git sorting order
+		try {
+			filter.include(fakeWalk("d0"));
+			fail("StopWalkException expected");
+		} catch (StopWalkException e) {
+			// good
+		}
+
+		// non-ascii
+		try {
+			filter.include(fakeWalk("\u00C0"));
+			fail("StopWalkException expected");
+		} catch (StopWalkException e) {
+			// good
+		}
+	}
+
+	TreeWalk fakeWalk(final String path) throws IOException {
+		DirCache dc = DirCache.newInCore();
+		DirCacheEditor dce = dc.editor();
+		dce.add(new DirCacheEditor.PathEdit(path) {
+
+			public void apply(DirCacheEntry ent) {
+				ent.setFileMode(FileMode.REGULAR_FILE);
+			}
+		});
+		dce.finish();
+
+		TreeWalk ret = new TreeWalk((ObjectReader) null);
+		ret.reset();
+		ret.setRecursive(true);
+		ret.addTree(new DirCacheIterator(dc));
+		ret.next();
+		return ret;
+	}
+
+}