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Andrea Ligios 2018-02-17 21:40:01 +01:00 committed by maibin
parent 2afb745b6d
commit 2a127b3df3
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core-java/src/test/java/com/baeldung/decimalformat/DecimalFormatExamplesTest.java Normal file
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package com.baeldung.decimalformat;
import static org.assertj.core.api.Assertions.assertThat;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Locale;
import org.junit.Test;
public class DecimalFormatExamplesTest {
double d = 1234567.89;
@Test
public void givenSimpleDecimal_WhenFormatting_ThenCorrectOutput() {
assertThat(new DecimalFormat("#.##", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1234567.89");
assertThat(new DecimalFormat("0.00", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1234567.89");
assertThat(new DecimalFormat("#########.###", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1234567.89");
assertThat(new DecimalFormat("000000000.000", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("001234567.890");
}
@Test
public void givenSmallerDecimalPattern_WhenFormatting_ThenRounding() {
assertThat(new DecimalFormat("#.#", new DecimalFormatSymbols(Locale.ENGLISH)).format(d)).isEqualTo("1234567.9");
assertThat(new DecimalFormat("#", new DecimalFormatSymbols(Locale.ENGLISH)).format(d)).isEqualTo("1234568");
}
@Test
public void givenGroupingSeparator_WhenFormatting_ThenGroupedOutput() {
assertThat(new DecimalFormat("#,###.#", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1,234,567.9");
assertThat(new DecimalFormat("#,###", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1,234,568");
}
@Test
public void givenMixedPattern_WhenFormatting_ThenCorrectOutput() {
assertThat(new DecimalFormat("The # number", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("The 1234568 number");
assertThat(new DecimalFormat("The '#' # number", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("The # 1234568 number");
}
@Test
public void givenLocales_WhenFormatting_ThenCorrectOutput() {
assertThat(new DecimalFormat("#,###.##", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1,234,567.89");
assertThat(new DecimalFormat("#,###.##", new DecimalFormatSymbols(Locale.ITALIAN)).format(d))
.isEqualTo("1.234.567,89");
assertThat(new DecimalFormat("#,###.##", DecimalFormatSymbols.getInstance(new Locale("it", "IT"))).format(d))
.isEqualTo("1.234.567,89");
}
@Test
public void givenE_WhenFormatting_ThenScientificNotation() {
assertThat(new DecimalFormat("00.#######E0", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("12.3456789E5");
assertThat(new DecimalFormat("000.000000E0", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("123.456789E4");
assertThat(new DecimalFormat("##0.######E0", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1.23456789E6");
assertThat(new DecimalFormat("###.000000E0", new DecimalFormatSymbols(Locale.ENGLISH)).format(d))
.isEqualTo("1.23456789E6");
}
@Test
public void givenString_WhenParsing_ThenCorrectOutput() throws ParseException {
assertThat(new DecimalFormat("", new DecimalFormatSymbols(Locale.ENGLISH)).parse("1234567.89"))
.isEqualTo(1234567.89);
assertThat(new DecimalFormat("", new DecimalFormatSymbols(Locale.ITALIAN)).parse("1.234.567,89"))
.isEqualTo(1234567.89);
}
@Test
public void givenStringAndBigDecimalFlag_WhenParsing_ThenCorrectOutput() throws ParseException {
NumberFormat nf = new DecimalFormat("", new DecimalFormatSymbols(Locale.ENGLISH));
((DecimalFormat) nf).setParseBigDecimal(true);
assertThat(nf.parse("1234567.89")).isEqualTo(BigDecimal.valueOf(1234567.89));
}
}