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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) 2006-2013 Rogério Liesenfeld
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.argumentMatching;

import org.jetbrains.annotations.*;

/**
 * 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(@Nullable Object decimalValue)
   {
      return decimalValue instanceof Number && actualDelta((Number) decimalValue) <= delta;
   }

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

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