package cn.iocoder.yudao.module.erp.service.statistics;
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import org.junit.jupiter.api.Test;
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import java.math.BigDecimal;
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import static org.junit.jupiter.api.Assertions.*;
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class PurchasePriceMetricsTest {
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@Test
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void comparesLatestPriceToPreviousAndAvoidsDivisionByZero() {
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assertEquals(new BigDecimal("25.00"), PurchasePriceMetrics.changeRate(new BigDecimal("10"), new BigDecimal("8")));
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assertNull(PurchasePriceMetrics.changeRate(new BigDecimal("10"), BigDecimal.ZERO));
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assertNull(PurchasePriceMetrics.changeRate(new BigDecimal("10"), null));
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assertEquals(new BigDecimal("-20.00"), PurchasePriceMetrics.changeRate(new BigDecimal("8"), new BigDecimal("10")));
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}
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}
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