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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 StringContainmentMatcher extends SubstringMatcher
{
   public StringContainmentMatcher(CharSequence substring) { super(substring); }

   public boolean matches(Object string)
   {
      return string instanceof CharSequence && string.toString().contains(substring);
   }

   public void writeMismatchPhrase(ArgumentMismatch argumentMismatch)
   {
      argumentMismatch.append("a string containing ").appendFormatted(substring);
   }
}