public function testIsNull()
{
$outcome = new OutcomeVariable('var1', Cardinality::SINGLE, BaseType::STRING);
$this->assertTrue($outcome->isNull());
$outcome->setValue(new QtiString(''));
$this->assertTrue($outcome->isNull());
$outcome->setValue(new QtiString('String!'));
$this->assertFalse($outcome->isNull());
$outcome = new OutcomeVariable('var1', Cardinality::SINGLE, BaseType::INTEGER);
$this->assertTrue($outcome->isNull());
$outcome->setValue(new QtiInteger(0));
$this->assertFalse($outcome->isNull());
$outcome->setValue(new QtiInteger(-1));
$this->assertFalse($outcome->isNull());
$outcome->setValue(new QtiInteger(100));
$this->assertFalse($outcome->isNull());
$outcome = new OutcomeVariable('var1', Cardinality::SINGLE, BaseType::FLOAT);
$this->assertTrue($outcome->isNull());
$outcome->setValue(new QtiFloat(0.25));
$this->assertFalse($outcome->isNull());
$outcome->setValue(new QtiFloat(-1.2));
$this->assertFalse($outcome->isNull());
$outcome->setValue(new QtiFloat(100.12));
$this->assertFalse($outcome->isNull());
$outcome = new OutcomeVariable('var1', Cardinality::SINGLE, BaseType::BOOLEAN);
$this->assertTrue($outcome->isNull());
$outcome->setValue(new QtiBoolean(true));
$this->assertFalse($outcome->isNull());
$outcome->setValue(new QtiBoolean(false));
$this->assertFalse($outcome->isNull());
$outcome = new OutcomeVariable('var1', Cardinality::MULTIPLE, BaseType::BOOLEAN);
$this->assertTrue($outcome->isNull());
$value = $outcome->getValue();
$value[] = new QtiBoolean(true);
$this->assertFalse($outcome->isNull());
$outcome = new OutcomeVariable('var1', Cardinality::ORDERED, BaseType::STRING);
$this->assertTrue($outcome->isNull());
$value = $outcome->getValue();
$value[] = new QtiString('string!');
$this->assertFalse($outcome->isNull());
$outcome = new OutcomeVariable('var1', Cardinality::RECORD);
$this->assertTrue($outcome->isNull());
$value = $outcome->getValue();
$value['point1'] = new QtiPoint(100, 200);
$this->assertFalse($outcome->isNull());
}
