UIfTest.java example

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/*
 * Copyright 2013 Google Inc. 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.errorprone.refaster;

import com.google.common.base.Joiner;
import com.google.common.testing.EqualsTester;
import com.google.common.testing.SerializableTester;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

/**
 * Tests for {@link UIf}.
 * 
 * @author lowasser@google.com (Louis Wasserman)
 */
@RunWith(JUnit4.class)
public class UIfTest extends AbstractUTreeTest {
  @Test
  public void equality() {
    new EqualsTester()
        .addEqualityGroup(UIf.create(
            UFreeIdent.create("cond"), 
            UBlock.create(UExpressionStatement.create(
                UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("y")))), 
            UBlock.create(UExpressionStatement.create(
                UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("z"))))))
        .addEqualityGroup(UIf.create(
            UFreeIdent.create("cond"), 
            UBlock.create(UExpressionStatement.create(
                UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("y")))),
            null))
        .addEqualityGroup(UIf.create(
            ULiteral.booleanLit(true), 
            UBlock.create(UExpressionStatement.create(
                UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("y")))),
            UBlock.create(UExpressionStatement.create(
                UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("z"))))))
        .testEquals();
  }
  
  @Test
  public void serialization() {
    SerializableTester.reserializeAndAssert(UIf.create(
        UFreeIdent.create("cond"), 
        UBlock.create(UExpressionStatement.create(
            UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("y")))), 
        UBlock.create(UExpressionStatement.create(
            UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("z"))))));
  }
  
  @Test
  public void inlineWithElse() {
    UIf ifTree = UIf.create(
        UFreeIdent.create("cond"), 
        UBlock.create(UExpressionStatement.create(
            UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("y")))), 
        UBlock.create(UExpressionStatement.create(
            UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("z")))));
    bind(new UFreeIdent.Key("cond"), parseExpression("true"));
    bind(new UFreeIdent.Key("x"), parseExpression("x"));
    bind(new UFreeIdent.Key("y"), parseExpression("\"foo\""));
    bind(new UFreeIdent.Key("z"), parseExpression("\"bar\""));
    assertInlines(
        Joiner.on(System.lineSeparator())
            .join(
                "if (true) {", //
                "    x = \"foo\";",
                "} else {",
                "    x = \"bar\";",
                "}"),
        ifTree);
  }
  
  @Test
  public void inlineWithoutElse() {
    UIf ifTree = UIf.create(
        UFreeIdent.create("cond"), 
        UBlock.create(UExpressionStatement.create(
            UAssign.create(UFreeIdent.create("x"), UFreeIdent.create("y")))), 
        null);
    bind(new UFreeIdent.Key("cond"), parseExpression("true"));
    bind(new UFreeIdent.Key("x"), parseExpression("x"));
    bind(new UFreeIdent.Key("y"), parseExpression("\"foo\""));
    assertInlines(
        Joiner.on(System.lineSeparator())
            .join(
                "if (true) {", //
                "    x = \"foo\";",
                "}"),
        ifTree);
  }
}