DivideTest.java

/*
 * Copyright 2015 S. Webber
 *
 * 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 org.oakgp.function.math;

import static org.oakgp.Type.integerType;

import java.math.BigDecimal;
import java.math.BigInteger;

import org.oakgp.function.AbstractFunctionTest;
import org.oakgp.function.Function;

public class DivideTest extends AbstractFunctionTest {
   @Override
   protected Divide getFunction() {
      return IntegerUtils.INTEGER_UTILS.getDivide();
   }

   @Override
   public void testEvaluate() {
      // integer
      evaluate("(/ 21 3)").to(7);
      evaluate("(/ 5 2)").to(2);
      evaluate("(/ 12 1)").to(12);
      evaluate("(/ 12 12)").to(1);

      // long
      evaluate("(/ 21L 3L)").to(7L);
      evaluate("(/ 5L 2L)").to(2L);

      // big integer
      evaluate("(/ 21I 3I)").to(BigInteger.valueOf(7));
      evaluate("(/ 5I 2I)").to(BigInteger.valueOf(2));

      // double
      evaluate("(/ 21.0 3.0)").to(7d);
      evaluate("(/ 5.0 2.0)").to(2.5d);

      // big decimal
      evaluate("(/ 21D 3D)").to(BigDecimal.valueOf(7));
      evaluate("(/ 5D 2D)").to(BigDecimal.valueOf(2.5));

      // safe divide - the result of anything divided by zero is one
      evaluate("(/ 12 0)").to(1);
      evaluate("(/ 12L 0L)").to(1L);
      evaluate("(/ 12I 0I)").to(BigInteger.valueOf(1));
      evaluate("(/ 12.0 0.0)").to(1d);
      evaluate("(/ 12D 0D)").to(BigDecimal.valueOf(1));
   }

   @Override
   public void testCanSimplify() {
      simplify("(/ 4 0)").to("1");
      simplify("(/ 4 1)").to("4");
      simplify("(/ 4 -1)").to("-4");
      simplify("(/ -4 -1)").to("4");
      simplify("(/ v0 -1)").to("(- 0 v0)");
      simplify("(/ 1 1)").to("1");
      simplify("(/ 7 7)").to("1");
      simplify("(/ -7 -7)").to("1");
      simplify("(/ v0 v0)").to("1");
   }

   @Override
   public void testCannotSimplify() {
      cannotSimplify("(/ 1 v0)", integerType());
   }

   @Override
   protected Function[] getFunctionSet() {
      return new Function[] { getFunction(), IntegerUtils.INTEGER_UTILS.getSubtract(), LongUtils.LONG_UTILS.getDivide(), DoubleUtils.DOUBLE_UTILS.getDivide(),
            BigIntegerUtils.BIG_INTEGER_UTILS.getDivide(), BigDecimalUtils.BIG_DECIMAL_UTILS.getDivide() };
   }
}