FetchRate/src/test/java/com/fetchrate/core/ConvertorTest.java at main · simddev/FetchRate · GitHub

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package com.fetchrate.core;

import com.fetchrate.persistence.RateDatabase;

import com.fetchrate.update.CryptoRateUpdater;

import org.junit.jupiter.api.Test;

import org.junit.jupiter.api.extension.ExtendWith;

import org.mockito.InjectMocks;

import org.mockito.Mock;

import org.mockito.junit.jupiter.MockitoExtension;

import java.math.BigDecimal;

import java.time.LocalDate;

import java.util.List;

import static org.junit.jupiter.api.Assertions.assertEquals;

import static org.junit.jupiter.api.Assertions.assertThrows;

import static org.junit.jupiter.api.Assertions.assertTrue;

import static org.mockito.ArgumentMatchers.any;

import static org.mockito.ArgumentMatchers.argThat;

import static org.mockito.ArgumentMatchers.eq;

import static org.mockito.Mockito.verifyNoInteractions;

import static org.mockito.Mockito.when;

@ExtendWith(MockitoExtension.class)

class ConvertorTest {

@Mock

private RateDatabase database;

@Mock

private CurrencyClassifier classifier;

@Mock

private CryptoRateUpdater cryptoUpdater;

@InjectMocks

private Convertor convertor;

private final LocalDate testDate = LocalDate.of(2024, 1, 15);

@Test

void convert_eurInputReturnsSameAmount() {

when(classifier.isSupported("EUR")).thenReturn(true);

BigDecimal result = convertor.convert(new QueryRecord(new BigDecimal("100.00"), "EUR", testDate));

assertEquals(new BigDecimal("100.00"), result);

}

@Test

void convert_fiatCurrencyDividesByRate() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

when(database.findFiatRate(any())).thenReturn(

new FiatRateRecord("USD", testDate, new BigDecimal("2.00"))

);

BigDecimal result = convertor.convert(new QueryRecord(new BigDecimal("200.00"), "USD", testDate));

assertEquals(new BigDecimal("100.00"), result);

}

@Test

void convert_unsupportedCurrencyThrowsException() {

when(classifier.isSupported("FAKE")).thenReturn(false);

assertThrows(IllegalArgumentException.class, () ->

convertor.convert(new QueryRecord(new BigDecimal("100"), "FAKE", testDate)));

}

@Test

void convert_fiatOnSaturday_throwsWithWeekendMessage() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

LocalDate saturday = LocalDate.of(2024, 1, 13); // known Saturday

IllegalArgumentException ex = assertThrows(IllegalArgumentException.class, () ->

convertor.convert(new QueryRecord(new BigDecimal("100"), "USD", saturday)));

assertTrue(ex.getMessage().contains("weekend"));

assertTrue(ex.getMessage().contains("2024-01-12")); // previous Friday

verifyNoInteractions(database);

}

@Test

void convert_fiatOnSunday_throwsWithWeekendMessage() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

LocalDate sunday = LocalDate.of(2024, 1, 14); // known Sunday

IllegalArgumentException ex = assertThrows(IllegalArgumentException.class, () ->

convertor.convert(new QueryRecord(new BigDecimal("100"), "USD", sunday)));

assertTrue(ex.getMessage().contains("weekend"));

assertTrue(ex.getMessage().contains("2024-01-12")); // previous Friday

verifyNoInteractions(database);

}

@Test

void convert_fiatRateNotFoundThrowsException() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

when(database.findFiatRate(any())).thenThrow(new RateNotFoundException("No rate found for USD on 2024-01-15"));

assertThrows(RateNotFoundException.class, () ->

convertor.convert(new QueryRecord(new BigDecimal("100"), "USD", testDate)));

}

@Test

void convert_cryptoCurrencyMultipliesByRate() {

when(classifier.isSupported("BTC")).thenReturn(true);

when(classifier.isFiat("BTC")).thenReturn(false);

when(database.findCryptoRate(any())).thenReturn(

new CryptoRateRecord("BTC", testDate, new BigDecimal("40000.00"))

);

BigDecimal result = convertor.convert(new QueryRecord(new BigDecimal("2.00"), "BTC", testDate));

assertEquals(new BigDecimal("80000.00"), result);

}

@Test

void convert_cryptoNotInDb_lazyFetchSucceeds_returnsResult() {

when(classifier.isSupported("XRP")).thenReturn(true);

when(classifier.isFiat("XRP")).thenReturn(false);

// First DB lookup misses, lazy fetch stores it, second lookup hits

when(database.findCryptoRate(any()))

.thenThrow(new RateNotFoundException("No crypto rate found for XRP on 2024-01-15"))

.thenReturn(new CryptoRateRecord("XRP", testDate, new BigDecimal("0.50")));

when(cryptoUpdater.fetchAndParseSpecific(eq("XRP"), eq(testDate)))

.thenReturn(List.of(new CryptoRateRecord("XRP", testDate, new BigDecimal("0.50"))));

BigDecimal result = convertor.convert(new QueryRecord(new BigDecimal("100"), "XRP", testDate));

assertEquals(new BigDecimal("50.00"), result);

}

@Test

void convertTo_eurOutput_returnsSameAsConvert() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

when(classifier.isSupportedOutputCurrency("EUR")).thenReturn(true);

when(database.findFiatRate(any())).thenReturn(

new FiatRateRecord("USD", testDate, new BigDecimal("2.00"))

);

BigDecimal result = convertor.convertTo(new QueryRecord(new BigDecimal("200.00"), "USD", testDate), "EUR");

assertEquals(new BigDecimal("100.00"), result);

}

@Test

void convertTo_fiatOutput_appliesPivotRate() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

when(classifier.isSupportedOutputCurrency("GBP")).thenReturn(true);

when(database.findFiatRate(any())).thenReturn(

new FiatRateRecord("USD", testDate, new BigDecimal("2.00"))

);

when(database.findFiatRateOnOrBefore(eq("GBP"), eq(testDate))).thenReturn(

new FiatRateRecord("GBP", testDate, new BigDecimal("0.85"))

);

// 200 USD ÷ 2.00 = 100 EUR × 0.85 = 85 GBP

BigDecimal result = convertor.convertTo(new QueryRecord(new BigDecimal("200.00"), "USD", testDate), "GBP");

assertEquals(new BigDecimal("85.00"), result);

}

@Test

void convertTo_outputRateIsZero_throwsRateNotFoundException() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

when(classifier.isSupportedOutputCurrency("GBP")).thenReturn(true);

when(database.findFiatRate(any())).thenReturn(

new FiatRateRecord("USD", testDate, new BigDecimal("1.00"))

);

when(database.findFiatRateOnOrBefore(eq("GBP"), eq(testDate))).thenReturn(

new FiatRateRecord("GBP", testDate, BigDecimal.ZERO)

);

assertThrows(RateNotFoundException.class, () ->

convertor.convertTo(new QueryRecord(new BigDecimal("100"), "USD", testDate), "GBP"));

}

@Test

void convertTo_unsupportedOutputCurrency_throwsBeforeConversion() {

when(classifier.isSupportedOutputCurrency("BTC")).thenReturn(false);

assertThrows(IllegalArgumentException.class, () ->

convertor.convertTo(new QueryRecord(new BigDecimal("100"), "USD", testDate), "BTC"));

verifyNoInteractions(database);

}

@Test

void convertToCrypto_dividesByOutputCryptoRate() {

when(classifier.isSupported("BTC")).thenReturn(true);

when(classifier.isFiat("BTC")).thenReturn(false);

when(classifier.isFiat("ETH")).thenReturn(false);

when(database.findCryptoRate(argThat(q -> q != null && "BTC".equals(q.currencySymbol())))).thenReturn(

new CryptoRateRecord("BTC", testDate, new BigDecimal("40000.00"))

);

when(database.findCryptoRate(argThat(q -> q != null && "ETH".equals(q.currencySymbol())))).thenReturn(

new CryptoRateRecord("ETH", testDate, new BigDecimal("2500.00"))

);

// 2 BTC × 40000 = 80000 EUR ÷ 2500 = 32 ETH

BigDecimal result = convertor.convertToCrypto(

new QueryRecord(new BigDecimal("2"), "BTC", testDate), "ETH");

assertEquals(new BigDecimal("32.00000000"), result);

}

@Test

void convertToCrypto_fiatOutputSymbol_throwsWithHint() {

when(classifier.isFiat("USD")).thenReturn(true);

IllegalArgumentException ex = assertThrows(IllegalArgumentException.class, () ->

convertor.convertToCrypto(new QueryRecord(new BigDecimal("100"), "BTC", testDate), "USD"));

assertTrue(ex.getMessage().contains("--to"));

verifyNoInteractions(database);

}

@Test

void convertToCrypto_eurOutputSymbol_throwsWithHint() {

when(classifier.isFiat("EUR")).thenReturn(false);

IllegalArgumentException ex = assertThrows(IllegalArgumentException.class, () ->

convertor.convertToCrypto(new QueryRecord(new BigDecimal("100"), "BTC", testDate), "EUR"));

assertTrue(ex.getMessage().contains("--to"));

verifyNoInteractions(database);

}

@Test

void convertToCrypto_outputCryptoNotInDb_lazyFetchSucceeds() {

when(classifier.isSupported("USD")).thenReturn(true);

when(classifier.isFiat("USD")).thenReturn(true);

when(classifier.isFiat("SOL")).thenReturn(false);

when(database.findFiatRate(any())).thenReturn(

new FiatRateRecord("USD", testDate, new BigDecimal("1.00"))

);

when(database.findCryptoRate(any()))

.thenThrow(new RateNotFoundException("No crypto rate found for SOL on 2024-01-15"))

.thenReturn(new CryptoRateRecord("SOL", testDate, new BigDecimal("100.00")));

when(cryptoUpdater.fetchAndParseSpecific(eq("SOL"), eq(testDate)))

.thenReturn(List.of(new CryptoRateRecord("SOL", testDate, new BigDecimal("100.00"))));

// 100 USD ÷ 1.00 = 100 EUR ÷ 100 = 1 SOL

BigDecimal result = convertor.convertToCrypto(

new QueryRecord(new BigDecimal("100"), "USD", testDate), "SOL");

assertEquals(new BigDecimal("1.00000000"), result);

}

@Test

void convertToCrypto_outputCryptoNotInDb_lazyFetchFails_rethrows() {

when(classifier.isSupported("BTC")).thenReturn(true);

when(classifier.isFiat("BTC")).thenReturn(false);

when(classifier.isFiat("XRP")).thenReturn(false);

when(database.findCryptoRate(argThat(q -> q != null && "BTC".equals(q.currencySymbol())))).thenReturn(

new CryptoRateRecord("BTC", testDate, new BigDecimal("40000.00"))

);

when(database.findCryptoRate(argThat(q -> q != null && "XRP".equals(q.currencySymbol()))))

.thenThrow(new RateNotFoundException("No crypto rate found for XRP on 2024-01-15"));

when(cryptoUpdater.fetchAndParseSpecific(eq("XRP"), eq(testDate))).thenReturn(List.of());

assertThrows(RateNotFoundException.class, () ->

convertor.convertToCrypto(new QueryRecord(new BigDecimal("1"), "BTC", testDate), "XRP"));

}

@Test

void convert_cryptoNotInDb_lazyFetchReturnsNothing_rethrowsOriginalError() {

when(classifier.isSupported("XRP")).thenReturn(true);

when(classifier.isFiat("XRP")).thenReturn(false);

when(database.findCryptoRate(any()))

.thenThrow(new RateNotFoundException("No crypto rate found for XRP on 2024-01-15"));

when(cryptoUpdater.fetchAndParseSpecific(eq("XRP"), eq(testDate))).thenReturn(List.of());

RateNotFoundException ex = assertThrows(RateNotFoundException.class, () ->

convertor.convert(new QueryRecord(new BigDecimal("100"), "XRP", testDate)));

assertTrue(ex.getMessage().contains("XRP"));

}

@Test

void convert_cryptoInputRateIsZero_throwsRateNotFoundException() {

when(classifier.isSupported("BTC")).thenReturn(true);

when(classifier.isFiat("BTC")).thenReturn(false);

when(database.findCryptoRate(any())).thenReturn(

new CryptoRateRecord("BTC", testDate, BigDecimal.ZERO)

);

assertThrows(RateNotFoundException.class, () ->

convertor.convert(new QueryRecord(new BigDecimal("1"), "BTC", testDate)));

}

@Test

void convert_eurInputOnWeekend_returnsAmount() {

when(classifier.isSupported("EUR")).thenReturn(true);

LocalDate saturday = LocalDate.of(2024, 1, 13);

BigDecimal result = convertor.convert(new QueryRecord(new BigDecimal("100.00"), "EUR", saturday));

assertEquals(new BigDecimal("100.00"), result);

verifyNoInteractions(database);

}

FetchRate/src/test/java/com/fetchrate/core/ConvertorTest.java at main · simddev/FetchRate · GitHub

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