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JMockit is a Java toolkit for developer (unit/integration) testing. It contains mocking APIs and other tools, supporting both JUnit and TestNG. The mocking APIs allow all kinds of Java code, without testability restrictions, to be tested in isolation from selected dependencies.

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/*
 * Copyright (c) 2006-2011 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.argumentMatching;

/**
 * Matches a decimal argument against another within a given margin of error.
 */
public final class NumericEqualityMatcher implements ArgumentMatcher
{
   private final double value;
   private final double delta;

   public NumericEqualityMatcher(double value, double delta)
   {
      this.value = value;
      this.delta = delta;
   }

   public boolean matches(Object decimalValue)
   {
      return decimalValue instanceof Number && actualDelta((Number) decimalValue) <= delta;
   }

   private double actualDelta(Number decimalValue)
   {
      return Math.abs(decimalValue.doubleValue() - value);
   }

   public void writeMismatchPhrase(ArgumentMismatch argumentMismatch)
   {
      argumentMismatch.append("a numeric value within ").append(delta).append(" of ").append(value);
   }
}