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 * SciJava Common shared library for SciJava software.
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package org.scijava.convert;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import org.scijava.util.Types;

/**
 * Tests converter plugins that convert from primitive numeric types to other
 * primitive numeric types.
 * 
 * @author Alison Walter
 */
public abstract class AbstractNumberConverterTests {

	protected NumberToNumberConverter<?, ?> converter = getConverter();
	protected Class<?> srcType = converter.getInputType();
	protected Class<?> destType = converter.getOutputType();

	public abstract Number getSrc();

	public abstract NumberToNumberConverter<?, ?> getConverter();

	public abstract Number getExpectedValue();

	public abstract Number getInvalidInput();

	public abstract Class<?> getInvalidOutput();

	/**
	 * Test case for the wrapper classes
	 */
	@Test
	public void testWrapper() {
		final Number src = getSrc();
		final Number expect = getExpectedValue();
		assertTrue(destType.isInstance(converter.convert(src, destType)));
		assertEquals(expect, converter.convert(src, destType));
	}

	/**
	 * Test case for primitive values
	 */
	@Test
	public void testPrimitive() {
		final Number src = getSrc();
		final Number expect = getExpectedValue();
		assertEquals(expect, converter.convert(src, Types.unbox(destType)));
	}

	/**
	 * Test case for null input
	 */
	@Test
	public void nullInput() {
		iae("Null input", null, null);
	}

	/**
	 * Test case for invalid input class
	 */
	@Test
	public void incorrectInputType() {
		final Number input = getInvalidInput();
		final String message =
			"Expected input of type " + srcType.getSimpleName() + ", but got " +
				input.getClass().getSimpleName();
		iae(message, input, destType);
	}

	/**
	 * Test case for invalid output class
	 */
	@Test
	public void incorrectOutputType() {
		final Class<?> output = getInvalidOutput();
		final Number src = getSrc();
		final String message =
			"Expected output class of " + destType.getSimpleName() + ", but got " +
				output.getSimpleName();
		iae(message, src, output);
	}

	@Rule
	public ExpectedException exception = ExpectedException.none();

	// helper methods
	protected void
		iae(final String message, final Number src, final Class<?> dest)
	{
		exception(IllegalArgumentException.class, message, src, dest);
	}

	protected void exception(final Class<? extends Throwable> excType,
		final String message, final Number src, final Class<?> dest)
	{
		exception.expect(excType);
		exception.expectMessage(message);
		converter.convert(src, dest);
	}
}
