1 files changed, 45 insertions, 0 deletions
diff --git a/tools/java/runfiles/MockFile.java b/tools/java/runfiles/MockFile.java
new file mode 100644
index 0000000000..886bfcbcc8
--- /dev/null
+++ b/tools/java/runfiles/MockFile.java
@@ -0,0 +1,45 @@
+// Copyright 2018 The Bazel Authors. 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.runfiles;
+
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
+import java.io.Closeable;
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+final class MockFile implements Closeable {
+
+  public final Path path;
+
+  public MockFile(ImmutableList<String> lines) throws IOException {
+    String testTmpdir = System.getenv("TEST_TMPDIR");
+    if (Strings.isNullOrEmpty(testTmpdir)) {
+      throw new IOException("$TEST_TMPDIR is empty or undefined");
+    }
+    path = Files.createTempFile(new File(testTmpdir).toPath(), null, null);
+    Files.write(path, lines, StandardCharsets.UTF_8);
+  }
+
+  @Override
+  public void close() throws IOException {
+    if (path != null) {
+      Files.delete(path);
+    }
+  }
+}