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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;

public final class NullityMatcher implements ArgumentMatcher
{
   public static final ArgumentMatcher INSTANCE = new NullityMatcher();

   private NullityMatcher() {}
   public boolean matches(Object argValue) { return argValue == null; }
   public void writeMismatchPhrase(ArgumentMismatch argumentMismatch) { argumentMismatch.append("null"); }
}