AmountsNegationTest.java

package io.konik.util;

import com.neovisionaries.i18n.CurrencyCode;
import io.konik.zugferd.unqualified.Amount;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;

import java.math.BigDecimal;
import java.util.Arrays;
import java.util.Collection;

import static java.math.BigDecimal.valueOf;
import static org.assertj.core.api.Assertions.assertThat;
import static org.junit.runners.Parameterized.Parameter;
import static org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class AmountsNegationTest {

	@Parameters(name = "Case {index}: negation of {0} USD is {1} USD")
	public static Collection<Object[]> data() {
		return Arrays.asList(new Object[][]{
				{ BigDecimal.ZERO, BigDecimal.ZERO },
				{ valueOf(10), valueOf(-10) },
				{ valueOf(1), valueOf(-1) },
				{ valueOf(-0.002), valueOf(0.002) },
				{ valueOf(-421.233), valueOf(421.233) }
		});
	}

	@Parameter
	public BigDecimal input;

	@Parameter(1)
	public BigDecimal expectedResult;

	@Test
	public void test() {
		assertThat(Amounts.negate(new Amount(input, CurrencyCode.USD)))
				.isEqualToComparingFieldByField(new Amount(expectedResult, CurrencyCode.USD));
	}
}