Pinq\Expressions\Expression::returnExpression PHP Method

    public static final function returnExpression(Expression $value = null)
    {
        return new ReturnExpression($value);
    }

 public function testFunctionGetsReturnWithoutValueExpression()
 {
     /** @var $function Functions\ProjectionBase */
     $function = $this->functionWithEmptyReturnStatement();
     $this->assertSame(true, $function->hasReturnExpression());
     $this->assertEquals(O\Expression::returnExpression(), $function->getReturnExpression());
     $this->assertSame(false, $function->hasReturnValueExpression());
     $this->assertEquals(null, $function->getReturnValueExpression());
 }