JsonWriter_Test.java

/*******************************************************************************
 * Copyright (c) 2013 EclipseSource.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Ralf Sternberg - initial implementation and API
 ******************************************************************************/
package org.eclipse.rap.json;

import java.io.IOException;
import java.io.StringWriter;

import org.junit.Before;
import org.junit.Test;

import static org.junit.Assert.assertEquals;


public class JsonWriter_Test {

  private StringWriter output;
  private JsonWriter writer;

  @Before
  public void setUp() {
    output = new StringWriter();
    writer = new JsonWriter( output );
  }

  @Test
  public void write_passesThrough() throws IOException {
    writer.write( "foo" );

    assertEquals( "foo", output.toString() );
  }

  @Test
  public void writeString_empty() throws IOException {
    writer.writeString( "" );

    assertEquals( "\"\"", output.toString() );
  }

  @Test
  public void writeSting_escapesBackslashes() throws IOException {
    writer.writeString( "foo\\bar" );

    assertEquals( "\"foo\\\\bar\"", output.toString() );
  }

  @Test
  public void escapesQuotes() throws IOException {
    writer.writeString( "a\"b" );

    assertEquals( "\"a\\\"b\"", output.toString() );
  }

  @Test
  public void escapesEscapedQuotes() throws IOException {
    writer.writeString( "foo\\\"bar" );

    assertEquals( "\"foo\\\\\\\"bar\"", output.toString() );
  }

  @Test
  public void escapesNewLine() throws IOException {
    writer.writeString( "foo\nbar" );

    assertEquals( "\"foo\\nbar\"", output.toString() );
  }

  @Test
  public void escapesWindowsNewLine() throws IOException {
    writer.writeString( "foo\r\nbar" );

    assertEquals( "\"foo\\r\\nbar\"", output.toString() );
  }

  @Test
  public void escapesTabs() throws IOException {
    writer.writeString( "foo\tbar" );

    assertEquals( "\"foo\\tbar\"", output.toString() );
  }

  @Test
  public void escapesSpecialCharacters() throws IOException {
    writer.writeString( "foo\u2028bar\u2029" );

    assertEquals( "\"foo\\u2028bar\\u2029\"", output.toString() );
  }

  @Test
  public void escapesZeroCharacter() throws IOException {
    writer.writeString( string( 'f', 'o', 'o', (char)0, 'b', 'a', 'r' ) );

    assertEquals( "\"foo\\u0000bar\"", output.toString() );
  }

  @Test
  public void escapesEscapeCharacter() throws IOException {
    writer.writeString( string( 'f', 'o', 'o', (char)27, 'b', 'a', 'r' ) );

    assertEquals( "\"foo\\u001bbar\"", output.toString() );
  }

  @Test
  public void escapesControlCharacters() throws IOException {
    writer.writeString( string( (char)1, (char)8, (char)15, (char)16, (char)31 ) );

    assertEquals( "\"\\u0001\\u0008\\u000f\\u0010\\u001f\"", output.toString() );
  }

  @Test
  public void escapesFirstChar() throws IOException {
    writer.writeString( string( '\\', 'x' ) );

    assertEquals( "\"\\\\x\"", output.toString() );
  }

  @Test
  public void escapesLastChar() throws IOException {
    writer.writeString( string( 'x', '\\' ) );

    assertEquals( "\"x\\\\\"", output.toString() );
  }

  @Test
  public void writeObjectParts() throws IOException {
    writer.writeBeginObject();
    writer.writeNameValueSeparator();
    writer.writeObjectValueSeparator();
    writer.writeEndObject();

    assertEquals( "{:,}", output.toString() );
  }

  @Test
  public void writeObject_empty() throws IOException {
    writer.writeObject( new JsonObject() );

    assertEquals( "{}", output.toString() );
  }

  @Test
  public void writeObject_withSingleValue() throws IOException {
    JsonObject object = new JsonObject().add( "a", 23 );

    writer.writeObject( object );

    assertEquals( "{\"a\":23}", output.toString() );
  }

  @Test
  public void writeObject_withMultipleValues() throws IOException {
    JsonObject object = new JsonObject();
    object.add( "a", 23 );
    object.add( "b", 3.14f );
    object.add( "c", "foo" );
    object.add( "d", true );
    object.add( "e", ( String )null );

    writer.writeObject( object );

    assertEquals( "{\"a\":23,\"b\":3.14,\"c\":\"foo\",\"d\":true,\"e\":null}",
                  output.toString() );
  }

  @Test
  public void writeArrayParts() throws IOException {
    writer.writeBeginArray();
    writer.writeArrayValueSeparator();
    writer.writeEndArray();

    assertEquals( "[,]", output.toString() );
  }

  @Test
  public void writeArray_empty() throws IOException {
    writer.writeArray( new JsonArray() );

    assertEquals( "[]", output.toString() );
  }

  @Test
  public void writeArray_withSingleValue() throws IOException {
    JsonArray array = new JsonArray().add( 23 );

    writer.writeArray( array );

    assertEquals( "[23]", output.toString() );
  }

  @Test
  public void writeArray_withMultipleValues() throws IOException {
    JsonArray array = new JsonArray().add( 23 ).add( "foo" ).add( false );

    writer.writeArray( array );

    assertEquals( "[23,\"foo\",false]", output.toString() );
  }

  private static String string( char ... chars ) {
    String string = String.valueOf( chars );
    return string;
  }

}