/*
 * #%L
 * ImageJ software for multidimensional image processing and analysis.
 * %%
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 * Wisconsin-Madison, Broad Institute of MIT and Harvard, and Max Planck
 * Institute of Molecular Cell Biology and Genetics.
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 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
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 *    and/or other materials provided with the distribution.
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package imagej.core.plugins.debug;

import imagej.ext.module.ItemIO;
import imagej.ext.plugin.Parameter;
import imagej.ext.plugin.Plugin;

/**
 * Test plugin for verifying that invalid module parameters are dealt with using
 * proper error handling.
 * 
 * @author Curtis Rueden
 */
@Plugin(menuPath = "Plugins>Debug>Invalid Plugin", headless = true)
public class InvalidPlugin extends ParameterTester {

	@Parameter
	private int q;

	@Parameter
	private final float x = 0;
	
	@Parameter(type = ItemIO.OUTPUT)
	protected String output;

	@Override
	public void run() {
		final StringBuilder sb = new StringBuilder();

		append(sb, "InvalidPlugin results:");

		append(sb, "");
		append(sb, "\tq = " + q);
		append(sb, "\tx = " + x);
		append(sb, "");
		append(sb, "The fact that you are reading this means the test failed!");

		output = sb.toString();
	}

	private void append(final StringBuilder sb, final String s) {
		sb.append(s + "\n");
	}

}

Add plugin that tests handling of invalid params
Add plugin that tests handling of invalid params
