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Java example source code file (FilesSimplifyPathTest.java)

This example Java source code file (FilesSimplifyPathTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

filessimplifypathtest, ioexception, iterator, net, network, splitter, string, testcase, url, utf_8, util

The FilesSimplifyPathTest.java Java example source code

/*
 * Copyright (C) 2009 The Guava 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
 *
 * http://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.google.common.io;

import static com.google.common.base.Charsets.UTF_8;
import static com.google.common.io.Files.simplifyPath;

import com.google.common.base.CharMatcher;
import com.google.common.base.Splitter;

import junit.framework.TestCase;

import java.io.IOException;
import java.net.URL;
import java.util.Iterator;

/**
 * Unit tests for {@link Files#simplifyPath}.
 *
 * @author Pablo Bellver
 */
public class FilesSimplifyPathTest extends TestCase {

  public void testSimplifyEmptyString() {
    assertEquals(".", simplifyPath(""));
  }

  public void testSimplifyDot() {
    assertEquals(".", simplifyPath("."));
  }

  public void testSimplifyWhiteSpace() {
    assertEquals(" ", simplifyPath(" "));
  }

  public void testSimplify2() {
    assertEquals("x", simplifyPath("x"));
  }

  public void testSimplify3() {
    assertEquals("/a/b/c/d", simplifyPath("/a/b/c/d"));
  }

  public void testSimplify4() {
    assertEquals("/a/b/c/d", simplifyPath("/a/b/c/d/"));
  }

  public void testSimplify5() {
    assertEquals("/a/b", simplifyPath("/a//b"));
  }

  public void testSimplify6() {
    assertEquals("/a/b", simplifyPath("//a//b/"));
  }

  public void testSimplify7() {
    assertEquals("/", simplifyPath("/.."));
  }

  public void testSimplify8() {
    assertEquals("/", simplifyPath("/././././"));
  }

  public void testSimplify9() {
    assertEquals("/a", simplifyPath("/a/b/.."));
  }

  public void testSimplify10() {
    assertEquals("/", simplifyPath("/a/b/../../.."));
  }

  public void testSimplify11() {
    assertEquals("/", simplifyPath("//a//b/..////../..//"));
  }

  public void testSimplify12() {
    assertEquals("/x", simplifyPath("//a//../x//"));
  }

  public void testSimplify13() {
    assertEquals("../c", simplifyPath("a/b/../../../c"));
  }

  public void testSimplifyDotDot() {
    assertEquals("..", simplifyPath(".."));
  }

  public void testSimplifyDotDotSlash() {
    assertEquals("..", simplifyPath("../"));
    assertEquals("..", simplifyPath("a/../.."));
    assertEquals("..", simplifyPath("a/../../"));
  }

  public void testSimplifyDotDots() {
    assertEquals("../..", simplifyPath("a/../../.."));
    assertEquals("../../..", simplifyPath("a/../../../.."));
  }

  public void testSimplifyRootedDotDots() {
    assertEquals("/", simplifyPath("/../../.."));
    assertEquals("/", simplifyPath("/../../../"));
  }

  // b/4558855
  public void testMadbotsBug() {
    assertEquals("../this", simplifyPath("../this"));
    assertEquals("../this/is/ok", simplifyPath("../this/is/ok"));
    assertEquals("../ok", simplifyPath("../this/../ok"));
  }

  // https://code.google.com/p/guava-libraries/issues/detail?id=705
  public void test705() {
    assertEquals("../b", simplifyPath("x/../../b"));
    assertEquals("b", simplifyPath("x/../b"));
  }

  // https://code.google.com/p/guava-libraries/issues/detail?id=716
  public void test716() {
    assertEquals("b", simplifyPath("./b"));
    assertEquals("b", simplifyPath("./b/."));
    assertEquals("b", simplifyPath("././b/./."));
    assertEquals("b", simplifyPath("././b"));
    assertEquals("a/b", simplifyPath("./a/b"));
  }

  public void testHiddenFiles() {
    assertEquals(".b", simplifyPath(".b"));
    assertEquals(".b", simplifyPath("./.b"));
    assertEquals(".metadata/b", simplifyPath(".metadata/b"));
    assertEquals(".metadata/b", simplifyPath("./.metadata/b"));
  }

  // https://code.google.com/p/guava-libraries/issues/detail?id=716
  public void testMultipleDotFilenames() {
    assertEquals("..a", simplifyPath("..a"));
    assertEquals("/..a", simplifyPath("/..a"));
    assertEquals("/..a/..b", simplifyPath("/..a/..b"));
    assertEquals("/.....a/..b", simplifyPath("/.....a/..b"));
    assertEquals("..../....", simplifyPath("..../...."));
    assertEquals("..a../..b..", simplifyPath("..a../..b.."));
  }

  public void testSlashDot() {
    assertEquals("/", simplifyPath("/."));
  }

  // http://code.google.com/p/guava-libraries/issues/detail?id=722
  public void testInitialSlashDotDot() {
    assertEquals("/c", simplifyPath("/../c"));
  }

  // http://code.google.com/p/guava-libraries/issues/detail?id=722
  public void testInitialSlashDot() {
    assertEquals("/a", simplifyPath("/./a"));
    assertEquals("/.a", simplifyPath("/.a/a/.."));
  }

  // http://code.google.com/p/guava-libraries/issues/detail?id=722
  public void testConsecutiveParentsAfterPresent() {
    assertEquals("../..", simplifyPath("./../../"));
    assertEquals("../..", simplifyPath("./.././../"));
  }

  /*
   * We co-opt some URI resolution tests for our purposes.
   * Some of the tests have queries and anchors that are a little silly here.
   */

  /** http://gbiv.com/protocols/uri/rfc/rfc2396.html#rfc.section.C.1 */
  public void testRfc2396Normal() {
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/g"));
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/./g"));
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/g/"));

    assertEquals("/a/b/c/g?y", simplifyPath("/a/b/c/g?y"));
    assertEquals("/a/b/c/g#s", simplifyPath("/a/b/c/g#s"));
    assertEquals("/a/b/c/g?y#s", simplifyPath("/a/b/c/g?y#s"));
    assertEquals("/a/b/c/;x", simplifyPath("/a/b/c/;x"));
    assertEquals("/a/b/c/g;x", simplifyPath("/a/b/c/g;x"));
    assertEquals("/a/b/c/g;x?y#s", simplifyPath("/a/b/c/g;x?y#s"));
    assertEquals("/a/b/c", simplifyPath("/a/b/c/."));
    assertEquals("/a/b/c", simplifyPath("/a/b/c/./"));
    assertEquals("/a/b", simplifyPath("/a/b/c/.."));
    assertEquals("/a/b", simplifyPath("/a/b/c/../"));
    assertEquals("/a/b/g", simplifyPath("/a/b/c/../g"));
    assertEquals("/a", simplifyPath("/a/b/c/../.."));
    assertEquals("/a", simplifyPath("/a/b/c/../../"));
    assertEquals("/a/g", simplifyPath("/a/b/c/../../g"));
  }

  /** http://gbiv.com/protocols/uri/rfc/rfc2396.html#rfc.section.C.2 */
  public void testRfc2396Abnormal() {
    assertEquals("/a/b/c/g.", simplifyPath("/a/b/c/g."));
    assertEquals("/a/b/c/.g", simplifyPath("/a/b/c/.g"));
    assertEquals("/a/b/c/g..", simplifyPath("/a/b/c/g.."));
    assertEquals("/a/b/c/..g", simplifyPath("/a/b/c/..g"));
    assertEquals("/a/b/g", simplifyPath("/a/b/c/./../g"));
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/./g/."));
    assertEquals("/a/b/c/g/h", simplifyPath("/a/b/c/g/./h"));
    assertEquals("/a/b/c/h", simplifyPath("/a/b/c/g/../h"));
    assertEquals("/a/b/c/g;x=1/y", simplifyPath("/a/b/c/g;x=1/./y"));
    assertEquals("/a/b/c/y", simplifyPath("/a/b/c/g;x=1/../y"));
  }

  /** http://gbiv.com/protocols/uri/rfc/rfc3986.html#relative-normal */
  public void testRfc3986Normal() {
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/g"));
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/./g"));
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/g/"));

    assertEquals("/a/b/c/g?y", simplifyPath("/a/b/c/g?y"));
    assertEquals("/a/b/c/g#s", simplifyPath("/a/b/c/g#s"));
    assertEquals("/a/b/c/g?y#s", simplifyPath("/a/b/c/g?y#s"));
    assertEquals("/a/b/c/;x", simplifyPath("/a/b/c/;x"));
    assertEquals("/a/b/c/g;x", simplifyPath("/a/b/c/g;x"));
    assertEquals("/a/b/c/g;x?y#s", simplifyPath("/a/b/c/g;x?y#s"));

    assertEquals("/a/b/c", simplifyPath("/a/b/c/."));
    assertEquals("/a/b/c", simplifyPath("/a/b/c/./"));
    assertEquals("/a/b", simplifyPath("/a/b/c/.."));
    assertEquals("/a/b", simplifyPath("/a/b/c/../"));
    assertEquals("/a/b/g", simplifyPath("/a/b/c/../g"));
    assertEquals("/a", simplifyPath("/a/b/c/../.."));
    assertEquals("/a", simplifyPath("/a/b/c/../../"));
    assertEquals("/a/g", simplifyPath("/a/b/c/../../g"));
  }

  /** http://gbiv.com/protocols/uri/rfc/rfc3986.html#relative-abnormal */
  public void testRfc3986Abnormal() {
    assertEquals("/g", simplifyPath("/a/b/c/../../../g"));
    assertEquals("/g", simplifyPath("/a/b/c/../../../../g"));

    assertEquals("/a/b/c/g.", simplifyPath("/a/b/c/g."));
    assertEquals("/a/b/c/.g", simplifyPath("/a/b/c/.g"));
    assertEquals("/a/b/c/g..", simplifyPath("/a/b/c/g.."));
    assertEquals("/a/b/c/..g", simplifyPath("/a/b/c/..g"));
    assertEquals("/a/b/g", simplifyPath("/a/b/c/./../g"));
    assertEquals("/a/b/c/g", simplifyPath("/a/b/c/./g/."));
    assertEquals("/a/b/c/g/h", simplifyPath("/a/b/c/g/./h"));
    assertEquals("/a/b/c/h", simplifyPath("/a/b/c/g/../h"));
    assertEquals("/a/b/c/g;x=1/y", simplifyPath("/a/b/c/g;x=1/./y"));
    assertEquals("/a/b/c/y", simplifyPath("/a/b/c/g;x=1/../y"));
  }

  public void testExtensiveWithAbsolutePrefix() throws IOException {
    // Inputs are /b/c/<every possible 10-character string of characters "a./">
    // Expected outputs are from realpath -s.
    doExtensiveTest("testdata/simplifypathwithabsoluteprefixtests.txt");
  }

  public void testExtensiveNoPrefix() throws IOException {
    /*
     * Inputs are <every possible 10-character string of characters "a./">
     *
     * Expected outputs are generated by the code itself, but they've been
     * checked against the inputs under Bash in order to confirm that the two
     * forms are equivalent (though not necessarily minimal, though we hope this
     * to be the case). Thus, this test is more of a regression test.
     *
     * Rough instructions to regenerate the test outputs and verify correctness:
     * - Temporarily change this test:
     * --- Comment out assertEquals.
     * --- System.out.println(input + " " + simplifyPath(input));
     * --- fail(). (If the test were to pass, its output would be hidden.)
     * - Run the test.
     * - Pull the relevant lines of output from the test into a testcases file.
     * - Test the output:
     * --- cat testcases | while read L; do
     *       X=($L)
     *       A=$( cd /b/c && sudo mkdir -p ${X[0]} && cd ${X[0]} && pwd |
     *           sed -e 's#^//*#/#' )
     *       B=$( cd /b/c && cd ${X[1]} && pwd )
     *       cmp -s <(echo $A) <(echo $B) || echo "$X[0] -> $A vs. $B"
     *     done | tee testoutput
     * - Move that testcases file to the appropriate name under testdata.
     *
     * The last test will take hours, and if it passes, the output will be empty.
     */
    doExtensiveTest("testdata/simplifypathnoprefixtests.txt");
  }

  private void doExtensiveTest(String resourceName) throws IOException {
    Splitter splitter = Splitter.on(CharMatcher.whitespace());
    URL url = getClass().getResource(resourceName);
    for (String line : Resources.readLines(url, UTF_8)) {
      Iterator<String> iterator = splitter.split(line).iterator();
      String input = iterator.next();
      String expectedOutput = iterator.next();
      assertFalse(iterator.hasNext());
      assertEquals(expectedOutput, simplifyPath(input));
    }
  }
}

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