Pinq\Tests\Integration\ExpressionTrees\ExpressionEvaluationTest::testUsedVariableIsset PHP Method

    public function testUsedVariableIsset()
    {
        $this->assertEvaluatesTo(function () {
            isset($var);
        }, false);
        $var = null;
        $this->assertEvaluatesTo(function () use($var) {
            isset($var);
        }, false);
        $var = 1;
        $this->assertEvaluatesTo(function () use($var) {
            isset($var);
        }, true);
    }