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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2017 The Closure Compiler 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.javascript.jscomp.parsing.parser.testing;

import static com.google.common.base.Strings.lenientFormat;
import static com.google.common.truth.Fact.simpleFact;
import static com.google.common.truth.Truth.assertAbout;

import com.google.common.truth.FailureMetadata;
import com.google.common.truth.Subject;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.jscomp.parsing.parser.FeatureSet.Feature;
import javax.annotation.CheckReturnValue;

/**
 * A Truth Subject for FeatureSet. Usage:
 *
 *  *   import static com.google.javascript.jscomp.parsing.parser.testing.FeatureSetSubject.assertFS;
 *   ...
 *   assertFS(features).contains(otherFeatures);
 *   assertFS(features).containsNoneOf(otherFeatures);
 * 
 */
public class FeatureSetSubject extends Subject {
  @CheckReturnValue
  public static FeatureSetSubject assertFS(FeatureSet fs) {
    return assertAbout(FeatureSetSubject::new).that(fs);
  }

  private final FeatureSet actual;

  public FeatureSetSubject(FailureMetadata failureMetadata, FeatureSet featureSet) {
    super(failureMetadata, featureSet);
    this.actual = featureSet;
  }

  public void contains(FeatureSet other) {
    if (!actual.contains(other)) {
      failWithoutActual(
          simpleFact(
              lenientFormat("Expected a FeatureSet containing: %s\nBut got: %s", other, actual)));
    }
  }

  public void containsNoneOf(FeatureSet other) {
    if (!other.without(actual).equals(other)) {
      failWithoutActual(
          simpleFact(
              lenientFormat(
                  "Expected a FeatureSet containing none of: %s\nBut got: %s", other, actual)));
    }
  }

  public void has(Feature feature) {
    if (!actual.has(feature)) {
      failWithoutActual(
          simpleFact(
              lenientFormat("Expected a FeatureSet that has: %s\nBut got: %s", feature, actual)));
    }
  }

  public void doesNotHave(Feature feature) {
    if (actual.has(feature)) {
      failWithoutActual(
          simpleFact(
              lenientFormat(
                  "Expected a FeatureSet that doesn't have: %s\nBut got: %s", feature, actual)));
    }
  }

  public void equals(FeatureSet other) {
    if (!actual.equals(other)) {
      failWithoutActual(
          simpleFact(
              lenientFormat("Expected a FeatureSet equal to: %s\nBut got: %s", other, actual)));
    }
  }
}