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 *
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 *
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 * @package    qtype_calculated
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 * @package    qtype_calculated
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 * @copyright  2011 The Open University
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 * @copyright  2011 The Open University
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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 */
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class variablesubstituter_test extends \advanced_testcase {
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final class variablesubstituter_test extends \advanced_testcase {
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    public function test_simple_expression(): void {
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    public function test_simple_expression(): void {
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        $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
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        $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
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        $this->assertEquals(3, $vs->calculate('{a} + {b}'));
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        $this->assertEquals(3, $vs->calculate('{a} + {b}'));
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    }
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    }
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        $this->expectException(\moodle_exception::class);
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        $this->expectException(\moodle_exception::class);
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        $vs->calculate('{a}{b}'); // Have to make sure this does not just evaluate to 12.
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        $vs->calculate('{a}{b}'); // Have to make sure this does not just evaluate to 12.
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    }
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    }
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    public function test_division_by_zero_expression(): void {
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        if (intval(PHP_VERSION) < 7) {
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            $this->markTestSkipped('Division by zero triggers a PHP warning before PHP 7.');
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        }
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    public function test_division_by_zero_expression(): void {
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        $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 0), '.');
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        $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 0), '.');
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        $this->expectException(\moodle_exception::class);
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        $this->expectException(\moodle_exception::class);
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        $vs->calculate('{a} / {b}');
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        $vs->calculate('{a} / {b}');