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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.

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/*
 * Copyright 2020 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.testing;

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.colors.Color;
import com.google.javascript.jscomp.colors.ObjectColor;
import javax.annotation.Nullable;

/** Subject for {@link Color} */
public final class ColorSubject extends Subject {

  @Nullable private final Color actual;

  private ColorSubject(FailureMetadata metadata, @Nullable Color actual) {
    super(metadata, actual);
    this.actual = actual;
  }

  public static Factory colors() {
    return ColorSubject::new;
  }

  public static ColorSubject assertThat(@Nullable Color actual) {
    return assertAbout(colors()).that(actual);
  }

  private Color actualNonNull() {
    isNotNull();
    return actual;
  }

  // Custom assertions

  public void isPrimitive() {
    check("isPrimitive").that(actualNonNull().isPrimitive()).isTrue();
  }

  public void isUnion() {
    check("isUnion").that(actualNonNull().isUnion()).isTrue();
  }

  public void isObject() {
    check("isObject").that(actualNonNull().isObject()).isTrue();
  }

  public void isInvalidating() {
    check("isInvalidating").that(actualNonNull().isInvalidating()).isTrue();
  }

  public void isNotInvalidating() {
    check("isInvalidating").that(actualNonNull().isInvalidating()).isFalse();
  }

  public void hasAlternates(Color... alternates) {
    isUnion();
    check("getAlternates().containsExactly()")
        .that(actualNonNull().getAlternates())
        // cast to Object[] to suppress warning about varargs vs. non-varargs call confusion
        .containsExactly((Object[]) alternates);
  }

  public void hasDisambiguationSupertypes(Color... alternates) {
    isObject();
    check("getDirectSupertypes().containsExactly()")
        .that(((ObjectColor) actualNonNull()).getDisambiguationSupertypes())
        // cast to Object[] to suppress warning about varargs vs. non-varargs call confusion
        .containsExactly((Object[]) alternates);
  }
}