1 files changed, 312 insertions, 0 deletions
diff --git a/src/test/java/com/google/devtools/build/lib/vfs/PathTest.java b/src/test/java/com/google/devtools/build/lib/vfs/PathTest.java
new file mode 100644
index 0000000000..738e454e43
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+++ b/src/test/java/com/google/devtools/build/lib/vfs/PathTest.java
@@ -0,0 +1,312 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// 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.devtools.build.lib.vfs;
+
+import static com.google.common.truth.Truth.assertThat;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotSame;
+import static org.junit.Assert.assertSame;
+import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.fail;
+
+import com.google.common.collect.Lists;
+import com.google.common.testing.EqualsTester;
+import com.google.common.testing.GcFinalization;
+import com.google.devtools.build.lib.util.BlazeClock;
+import com.google.devtools.build.lib.vfs.inmemoryfs.InMemoryFileSystem;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.lang.ref.WeakReference;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * A test for {@link Path}.
+ */
+@RunWith(JUnit4.class)
+public class PathTest {
+  private FileSystem filesystem;
+  private Path root;
+
+  @Before
+  public void setUp() throws Exception {
+    filesystem = new InMemoryFileSystem(BlazeClock.instance());
+    root = filesystem.getRootDirectory();
+    Path first = root.getChild("first");
+    first.createDirectory();
+  }
+
+  @Test
+  public void testStartsWithWorksForSelf() {
+    assertStartsWithReturns(true, "/first/child", "/first/child");
+  }
+
+  @Test
+  public void testStartsWithWorksForChild() {
+    assertStartsWithReturns(true,
+        "/first/child", "/first/child/grandchild");
+  }
+
+  @Test
+  public void testStartsWithWorksForDeepDescendant() {
+    assertStartsWithReturns(true,
+        "/first/child", "/first/child/grandchild/x/y/z");
+  }
+
+  @Test
+  public void testStartsWithFailsForParent() {
+    assertStartsWithReturns(false, "/first/child", "/first");
+  }
+
+  @Test
+  public void testStartsWithFailsForSibling() {
+    assertStartsWithReturns(false, "/first/child", "/first/child2");
+  }
+
+  @Test
+  public void testStartsWithFailsForLinkToDescendant()
+      throws Exception {
+    Path linkTarget = filesystem.getPath("/first/linked_to");
+    FileSystemUtils.createEmptyFile(linkTarget);
+    Path second = filesystem.getPath("/second/");
+    second.createDirectory();
+    second.getChild("child_link").createSymbolicLink(linkTarget);
+    assertStartsWithReturns(false, "/first", "/second/child_link");
+  }
+
+  @Test
+  public void testStartsWithFailsForNullPrefix() {
+    try {
+      filesystem.getPath("/first").startsWith(null);
+      fail();
+    } catch (Exception e) {
+    }
+  }
+
+  private void assertStartsWithReturns(boolean expected,
+                                       String ancestor,
+                                       String descendant) {
+    Path parent = filesystem.getPath(ancestor);
+    Path child = filesystem.getPath(descendant);
+    assertEquals(expected, child.startsWith(parent));
+  }
+
+  @Test
+  public void testGetChildWorks() {
+    assertGetChildWorks("second");
+    assertGetChildWorks("...");
+    assertGetChildWorks("....");
+  }
+
+  private void assertGetChildWorks(String childName) {
+    assertEquals(filesystem.getPath("/first/" + childName),
+        filesystem.getPath("/first").getChild(childName));
+  }
+
+  @Test
+  public void testGetChildFailsForChildWithSlashes() {
+    assertGetChildFails("second/third");
+    assertGetChildFails("./third");
+    assertGetChildFails("../third");
+    assertGetChildFails("second/..");
+    assertGetChildFails("second/.");
+    assertGetChildFails("/third");
+    assertGetChildFails("third/");
+  }
+
+  private void assertGetChildFails(String childName) {
+    try {
+      filesystem.getPath("/first").getChild(childName);
+      fail();
+    } catch (IllegalArgumentException e) {
+      // Expected.
+    }
+  }
+
+  @Test
+  public void testGetChildFailsForDotAndDotDot() {
+    assertGetChildFails(".");
+    assertGetChildFails("..");
+  }
+
+  @Test
+  public void testGetChildFailsForEmptyString() {
+    assertGetChildFails("");
+  }
+
+  @Test
+  public void testRelativeToWorks() {
+    assertRelativeToWorks("apple", "/fruit/apple", "/fruit");
+    assertRelativeToWorks("apple/jonagold", "/fruit/apple/jonagold", "/fruit");
+  }
+
+  @Test
+  public void testGetRelativeWithStringWorks() {
+    assertGetRelativeWorks("/first/x/y", "y");
+    assertGetRelativeWorks("/y", "/y");
+    assertGetRelativeWorks("/first/x/x", "./x");
+    assertGetRelativeWorks("/first/y", "../y");
+    assertGetRelativeWorks("/", "../../../../..");
+  }
+
+  @Test
+  public void testAsFragmentWorks() {
+    assertAsFragmentWorks("/");
+    assertAsFragmentWorks("//");
+    assertAsFragmentWorks("/first");
+    assertAsFragmentWorks("/first/x/y");
+    assertAsFragmentWorks("/first/x/y.foo");
+  }
+
+  @Test
+  public void testGetRelativeWithFragmentWorks() {
+    Path dir = filesystem.getPath("/first/x");
+    assertEquals("/first/x/y",
+                 dir.getRelative(new PathFragment("y")).toString());
+    assertEquals("/first/x/x",
+                 dir.getRelative(new PathFragment("./x")).toString());
+    assertEquals("/first/y",
+                 dir.getRelative(new PathFragment("../y")).toString());
+
+  }
+
+  @Test
+  public void testGetRelativeWithAbsoluteFragmentWorks() {
+    Path root = filesystem.getPath("/first/x");
+    assertEquals("/x/y",
+                 root.getRelative(new PathFragment("/x/y")).toString());
+  }
+
+  @Test
+  public void testGetRelativeWithAbsoluteStringWorks() {
+    Path root = filesystem.getPath("/first/x");
+    assertEquals("/x/y", root.getRelative("/x/y").toString());
+  }
+
+  @Test
+  public void testComparableSortOrder() {
+    Path zzz = filesystem.getPath("/zzz");
+    Path ZZZ = filesystem.getPath("/ZZZ");
+    Path abc = filesystem.getPath("/abc");
+    Path aBc = filesystem.getPath("/aBc");
+    Path AbC = filesystem.getPath("/AbC");
+    Path ABC = filesystem.getPath("/ABC");
+    List<Path> list = Lists.newArrayList(zzz, ZZZ, ABC, aBc, AbC, abc);
+    Collections.sort(list);
+    assertThat(list).containsExactly(ABC, AbC, ZZZ, aBc, abc, zzz).inOrder();
+  }
+
+  @Test
+  public void testParentOfRootIsRoot() {
+    assertSame(root, root.getRelative(".."));
+
+    assertSame(root.getRelative("dots"),
+               root.getRelative("broken/../../dots"));
+  }
+
+  @Test
+  public void testSingleSegmentEquivalence() {
+    assertSame(
+        root.getRelative("aSingleSegment"),
+        root.getRelative("aSingleSegment"));
+  }
+
+  @Test
+  public void testSiblingNonEquivalenceString() {
+    assertNotSame(
+        root.getRelative("aSingleSegment"),
+        root.getRelative("aDifferentSegment"));
+  }
+
+  @Test
+  public void testSiblingNonEquivalenceFragment() {
+    assertNotSame(
+        root.getRelative(new PathFragment("aSingleSegment")),
+        root.getRelative(new PathFragment("aDifferentSegment")));
+  }
+
+  @Test
+  public void testHashCodeStableAcrossGarbageCollections() {
+    Path parent = filesystem.getPath("/a");
+    PathFragment childFragment = new PathFragment("b");
+    Path child = parent.getRelative(childFragment);
+    WeakReference<Path> childRef = new WeakReference<>(child);
+    int childHashCode1 = childRef.get().hashCode();
+    assertEquals(childHashCode1, parent.getRelative(childFragment).hashCode());
+    child = null;
+    GcFinalization.awaitClear(childRef);
+    int childHashCode2 = parent.getRelative(childFragment).hashCode();
+    assertEquals(childHashCode1, childHashCode2);
+  }
+
+  @Test
+  public void testSerialization() throws Exception {
+    FileSystem oldFileSystem = Path.getFileSystemForSerialization();
+    try {
+      Path.setFileSystemForSerialization(filesystem);
+      Path root = filesystem.getPath("/");
+      Path p1 = filesystem.getPath("/foo");
+      Path p2 = filesystem.getPath("/foo/bar");
+
+      ByteArrayOutputStream bos = new ByteArrayOutputStream();
+      ObjectOutputStream oos = new ObjectOutputStream(bos);
+
+      oos.writeObject(root);
+      oos.writeObject(p1);
+      oos.writeObject(p2);
+
+      ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
+      ObjectInputStream ois = new ObjectInputStream(bis);
+
+      Path dsRoot = (Path) ois.readObject();
+      Path dsP1 = (Path) ois.readObject();
+      Path dsP2 = (Path) ois.readObject();
+
+      new EqualsTester()
+          .addEqualityGroup(root, dsRoot)
+          .addEqualityGroup(p1, dsP1)
+          .addEqualityGroup(p2, dsP2)
+          .testEquals();
+
+      assertTrue(p2.startsWith(p1));
+      assertTrue(p2.startsWith(dsP1));
+      assertTrue(dsP2.startsWith(p1));
+      assertTrue(dsP2.startsWith(dsP1));
+    } finally {
+      Path.setFileSystemForSerialization(oldFileSystem);
+    }
+  }
+
+  private void assertAsFragmentWorks(String expected) {
+    assertEquals(new PathFragment(expected), filesystem.getPath(expected).asFragment());
+  }
+
+  private void assertGetRelativeWorks(String expected, String relative) {
+    assertEquals(filesystem.getPath(expected),
+        filesystem.getPath("/first/x").getRelative(relative));
+  }
+
+  private void assertRelativeToWorks(String expected, String relative, String original) {
+    assertEquals(new PathFragment(expected),
+                 filesystem.getPath(relative).relativeTo(filesystem.getPath(original)));
+  }
+}