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JMockit is a Java toolkit for automated developer testing. It contains mocking/faking APIs and a code coverage tool, 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 JMockit developers
 * This file is subject to the terms of the MIT license (see LICENSE.txt).
 */
package mockit.internal.expectations.argumentMatching;

import javax.annotation.*;

/**
 * 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;
   }

   @Override @SuppressWarnings("FloatingPointEquality")
   public boolean same(@Nonnull NumericEqualityMatcher other) { return value == other.value && delta == other.delta; }

   @Override @SuppressWarnings("ParameterNameDiffersFromOverriddenParameter")
   public boolean matches(@Nullable Object decimalValue) {
      return decimalValue instanceof Number && actualDelta((Number) decimalValue) <= delta;
   }

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

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