JLambdaTest.java

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package com.helger.jcodemodel;

import static org.junit.Assert.assertEquals;

import org.junit.Test;

import com.helger.jcodemodel.util.CodeModelTestsHelper;

/**
 * Test class for class {@link JLambda}.
 *
 * @author Philip Helger
 */
public final class JLambdaTest
{
  private static final String CRLF = System.getProperty ("line.separator");

  @Test
  public void testExpressionBasic ()
  {
    final JLambda aLambda = new JLambda ();
    final JLambdaParam aParam = aLambda.addParam ("x");
    aLambda.body ().lambdaExpr (aParam.mul (2));
    assertEquals ("x -> (x* 2)", CodeModelTestsHelper.toString (aLambda));
  }

  @Test
  public void testExpressionNoParam ()
  {
    final JLambda aLambda = new JLambda ();
    aLambda.body ().lambdaExpr (JExpr.lit (2));
    assertEquals ("() ->  2", CodeModelTestsHelper.toString (aLambda));
  }

  @Test
  public void testExpressionBasicType ()
  {
    final JCodeModel cm = new JCodeModel ();

    final JLambda aLambda = new JLambda ();
    final JLambdaParam aParam = aLambda.addParam (cm.INT, "x");
    aLambda.body ().lambdaExpr (aParam.mul (2));
    assertEquals ("(int x) -> (x* 2)", CodeModelTestsHelper.toString (aLambda));
  }

  @Test
  public void testExpressionBasic2 ()
  {
    final JLambda aLambda = new JLambda ();
    final JLambdaParam aParam1 = aLambda.addParam ("x");
    final JLambdaParam aParam2 = aLambda.addParam ("y");
    aLambda.body ().lambdaExpr (aParam1.plus (aParam2));
    assertEquals ("(x, y) -> (x + y)", CodeModelTestsHelper.toString (aLambda));
  }

  @Test
  public void testExpressionBasicType2 ()
  {
    final JCodeModel cm = new JCodeModel ();

    final JLambda aLambda = new JLambda ();
    final JLambdaParam aParam1 = aLambda.addParam (cm.INT, "x");
    final JLambdaParam aParam2 = aLambda.addParam (cm.BYTE, "y");
    aLambda.body ().lambdaExpr (aParam1.plus (aParam2));
    assertEquals ("(int x, byte y) -> (x + y)", CodeModelTestsHelper.toString (aLambda));
  }

  @Test
  public void testStatementBasicType ()
  {
    final JCodeModel cm = new JCodeModel ();

    final JLambda aLambda = new JLambda ();
    final JLambdaParam aParam = aLambda.addParam (cm.INT, "x");
    aLambda.body ()._return (aParam.plus (1));
    assertEquals ("(int x) -> {" +
                  CRLF +
                  "    return (x + 1);" +
                  CRLF +
                  "}" +
                  CRLF,
                  CodeModelTestsHelper.toString (aLambda));
  }
}