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Jackson is a high-performance JSON processor (parser, generator)

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package main;

import org.codehaus.jackson.*;

import java.io.*;

/**
 * Set of basic unit tests for verifying that indenting
 * option of generator works correctly
 */
public class TestPrettyPrinter
    extends BaseTest
{
    public void testSimpleDoc()
        throws Exception
    {
        StringWriter sw = new StringWriter();
        JsonGenerator gen = new JsonFactory().createJsonGenerator(sw);
        gen.useDefaultPrettyPrinter();

        gen.writeStartArray();
        gen.writeNumber(3);
        gen.writeString("abc");

        gen.writeStartArray();
        gen.writeBoolean(true);
        gen.writeEndArray();

        gen.writeStartObject();
        gen.writeFieldName("f");
        gen.writeNull();
        gen.writeFieldName("f2");
        gen.writeNull();
        gen.writeEndObject();

        gen.writeEndArray();
        gen.close();

        String docStr = sw.toString();
        JsonParser jp = createParserUsingReader(docStr);

        assertEquals(JsonToken.START_ARRAY, jp.nextToken());

        assertEquals(JsonToken.VALUE_NUMBER_INT, jp.nextToken());
        assertEquals(3, jp.getIntValue());
        assertEquals(JsonToken.VALUE_STRING, jp.nextToken());
        assertEquals("abc", jp.getText());

        assertEquals(JsonToken.START_ARRAY, jp.nextToken());
        assertEquals(JsonToken.VALUE_TRUE, jp.nextToken());
        assertEquals(JsonToken.END_ARRAY, jp.nextToken());

        assertEquals(JsonToken.START_OBJECT, jp.nextToken());
        assertEquals(JsonToken.FIELD_NAME, jp.nextToken());
        assertEquals("f", jp.getText());
        assertEquals(JsonToken.VALUE_NULL, jp.nextToken());
        assertEquals(JsonToken.FIELD_NAME, jp.nextToken());
        assertEquals("f2", jp.getText());
        assertEquals(JsonToken.VALUE_NULL, jp.nextToken());
        assertEquals(JsonToken.END_OBJECT, jp.nextToken());

        assertEquals(JsonToken.END_ARRAY, jp.nextToken());

        jp.close();
    }
}