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Add failing test for JSON roundtrip precision loss #731

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Add failing test for JSON roundtrip precision loss #731

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27 changes: 27 additions & 0 deletions src/test/java/com/fasterxml/jackson/core/json/JsonParserGeneratorTest.java
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package com.fasterxml.jackson.core.json;

import com.fasterxml.jackson.core.BaseTest;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;

import java.io.ByteArrayOutputStream;
import java.io.StringWriter;

public class JsonParserGeneratorTest
extends BaseTest {
final JsonFactory JSON_F = newStreamFactory();

public void testRoundtripBigDecimal() throws Exception {
String input = "1e999";
JsonParser parser = JSON_F.createParser(input);
parser.nextToken();
StringWriter stringWriter = new StringWriter();
JsonGenerator generator = JSON_F.createGenerator(stringWriter);
generator.copyCurrentEvent(parser);
parser.close();
generator.close();
String actual = stringWriter.toString(); // "Infinity"
assertEquals(input, actual);
}
}