1 files changed, 144 insertions, 0 deletions
diff --git a/jimfs/src/test/java/com/google/common/jimfs/TestUtils.java b/jimfs/src/test/java/com/google/common/jimfs/TestUtils.java
new file mode 100644
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+++ b/jimfs/src/test/java/com/google/common/jimfs/TestUtils.java
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * 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.jimfs;
+
+import static java.nio.file.LinkOption.NOFOLLOW_LINKS;
+import static org.junit.Assert.assertFalse;
+
+import com.google.common.collect.ImmutableList;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.file.DirectoryStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+
+/** @author Colin Decker */
+public final class TestUtils {
+
+  private TestUtils() {}
+
+  public static byte[] bytes(int... bytes) {
+    byte[] result = new byte[bytes.length];
+    for (int i = 0; i < bytes.length; i++) {
+      result[i] = (byte) bytes[i];
+    }
+    return result;
+  }
+
+  public static byte[] bytes(String bytes) {
+    byte[] result = new byte[bytes.length()];
+    for (int i = 0; i < bytes.length(); i++) {
+      String digit = bytes.substring(i, i + 1);
+      result[i] = Byte.parseByte(digit);
+    }
+    return result;
+  }
+
+  public static byte[] preFilledBytes(int length, int fillValue) {
+    byte[] result = new byte[length];
+    Arrays.fill(result, (byte) fillValue);
+    return result;
+  }
+
+  public static byte[] preFilledBytes(int length) {
+    byte[] bytes = new byte[length];
+    for (int i = 0; i < length; i++) {
+      bytes[i] = (byte) i;
+    }
+    return bytes;
+  }
+
+  public static ByteBuffer buffer(String bytes) {
+    return ByteBuffer.wrap(bytes(bytes));
+  }
+
+  public static Iterable<ByteBuffer> buffers(String... bytes) {
+    List<ByteBuffer> result = new ArrayList<>();
+    for (String b : bytes) {
+      result.add(buffer(b));
+    }
+    return result;
+  }
+
+  /** Returns a number of permutations of the given path that should all locate the same file. */
+  public static Iterable<Path> permutations(Path path) throws IOException {
+    Path workingDir = path.getFileSystem().getPath("").toRealPath();
+    boolean directory = Files.isDirectory(path);
+
+    Set<Path> results = new HashSet<>();
+    results.add(path);
+    if (path.isAbsolute()) {
+      results.add(workingDir.relativize(path));
+    } else {
+      results.add(workingDir.resolve(path));
+    }
+    if (directory) {
+      for (Path p : ImmutableList.copyOf(results)) {
+        results.add(p.resolve("."));
+        results.add(p.resolve(".").resolve("."));
+        Path fileName = p.getFileName();
+        if (fileName != null
+            && !fileName.toString().equals(".")
+            && !fileName.toString().equals("..")) {
+          results.add(p.resolve("..").resolve(fileName));
+          results.add(p.resolve("..").resolve(".").resolve(fileName));
+          results.add(p.resolve("..").resolve(".").resolve(fileName).resolve("."));
+          results.add(p.resolve(".").resolve("..").resolve(".").resolve(fileName));
+        }
+      }
+
+      try (DirectoryStream<Path> stream = Files.newDirectoryStream(path)) {
+        for (Path child : stream) {
+          if (Files.isDirectory(child, NOFOLLOW_LINKS)) {
+            Path childName = child.getFileName();
+            for (Path p : ImmutableList.copyOf(results)) {
+              results.add(p.resolve(childName).resolve(".."));
+              results.add(p.resolve(childName).resolve(".").resolve(".").resolve(".."));
+              results.add(p.resolve(childName).resolve("..").resolve("."));
+              results.add(
+                  p.resolve(childName).resolve("..").resolve(childName).resolve(".").resolve(".."));
+            }
+            break; // no need to add more than one child
+          }
+        }
+      }
+    }
+    return results;
+  }
+
+  // equivalent to the Junit 4.11 method.
+  public static void assertNotEquals(Object unexpected, Object actual) {
+    assertFalse(
+        "Values should be different. Actual: " + actual, Objects.equals(unexpected, actual));
+  }
+
+  static RegularFile regularFile(int size) {
+    RegularFile file = RegularFile.create(0, new HeapDisk(8096, 1000, 1000));
+    try {
+      file.write(0, new byte[size], 0, size);
+      return file;
+    } catch (IOException e) {
+      throw new AssertionError(e);
+    }
+  }
+}