test/com/facebook/buck/dalvik/EstimateLinearAllocStepTest.java

/*
 * Copyright 2013-present Facebook, 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.facebook.buck.dalvik;

import static org.junit.Assert.assertEquals;

import com.facebook.buck.dalvik.EstimateLinearAllocStep.LinearAllocEstimator;
import com.facebook.buck.io.ProjectFilesystem;
import com.facebook.buck.java.classes.FileLike;
import com.facebook.buck.step.ExecutionContext;
import com.facebook.buck.step.TestExecutionContext;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableMap;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Map;

public class EstimateLinearAllocStepTest {

  @Rule
  public TemporaryFolder tmp = new TemporaryFolder();

  private LinearAllocEstimator linearAllocEstimator = new FakeLinearAllocEstimator(
      ImmutableMap.<String, Integer>builder()
      .put("com/example/Foo.class", 100)
      .put("com/example/Bar.class", 250)
      .put("com/example/subpackage/Baz.class", 75)
      .build());

  @Test
  public void testExecuteEstimateLinearAllocStep() throws IOException {
    // Create a directory.
    String name = "dir";
    tmp.newFolder(name);

    tmp.newFolder("dir/com");
    tmp.newFolder("dir/com/example");
    tmp.newFolder("dir/com/example/subpackage");

    tmp.newFile("dir/com/example/Foo.class");
    tmp.newFile("dir/com/example/Bar.class");
    tmp.newFile("dir/com/example/not_a_class.png");
    tmp.newFile("dir/com/example/subpackage/Baz.class");

    ExecutionContext context = TestExecutionContext
        .newBuilder()
        .setProjectFilesystem(new ProjectFilesystem(tmp.getRoot().toPath()))
        .build();

    Path pathToJarOrClassesDirectory = Paths.get(name);
    EstimateLinearAllocStep step = new EstimateLinearAllocStep(pathToJarOrClassesDirectory,
        linearAllocEstimator);
    int exitCode = step.execute(context);
    assertEquals(0, exitCode);
    assertEquals(Integer.valueOf(425), step.get());
  }

  @Test(expected = IllegalStateException.class)
  public void testGetBeforeExecuteThrowsException() {
    Path pathToJarOrClassesDirectory = Paths.get("out");
    EstimateLinearAllocStep step = new EstimateLinearAllocStep(pathToJarOrClassesDirectory,
        linearAllocEstimator);
    step.get();
  }

  @Test
  public void testGetShortName() {
    Path pathToJarOrClassesDirectory = Paths.get("out");
    EstimateLinearAllocStep step = new EstimateLinearAllocStep(pathToJarOrClassesDirectory,
        linearAllocEstimator);
    assertEquals("estimate_linear_alloc", step.getShortName());
  }

  @Test
  public void testGetDescription() {
    Path pathToJarOrClassesDirectory = Paths.get("out");
    EstimateLinearAllocStep step = new EstimateLinearAllocStep(pathToJarOrClassesDirectory,
        linearAllocEstimator);
    assertEquals("estimate_linear_alloc", step.getDescription(TestExecutionContext.newInstance()));
  }

  private static class FakeLinearAllocEstimator implements LinearAllocEstimator {

    private final Map<String, Integer> relativePathToCostMap;

    public FakeLinearAllocEstimator(ImmutableMap<String, Integer> relativePathToCostMap) {
      this.relativePathToCostMap = relativePathToCostMap;
    }

    @Override
    public int getEstimate(FileLike fileLike) throws IOException {
      return Preconditions.checkNotNull(relativePathToCostMap.get(fileLike.getRelativePath()));
    }
  }
}