question/type/calculated/tests/variablesubstituter_test.php

   1 <?php
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   3 //
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   5 // it under the terms of the GNU General Public License as published by
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   8 //
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  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13 //
  14 // You should have received a copy of the GNU General Public License
  15 // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 /**
  18  * Unit tests for qtype_calculated_variable_substituter.
  19  *
  20  * @package    qtype
  21  * @subpackage calculated
  22  * @copyright  2011 The Open University
  23  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  24  */
  25
  26
  27 defined('MOODLE_INTERNAL') || die();
  28
  29 global $CFG;
  30 require_once($CFG->dirroot . '/question/type/calculated/question.php');
  31 require_once($CFG->dirroot . '/question/type/calculated/questiontype.php');
  32
  33
  34 /**
  35  * Unit tests for {@link qtype_calculated_variable_substituter}.
  36  *
  37  * @copyright  2011 The Open University
  38  * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  39  */
  40 class qtype_calculated_variable_substituter_test extends advanced_testcase {
  41     public function test_simple_expression() {
  42         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
  43         $this->assertEquals(3, $vs->calculate('{a} + {b}'));
  44     }
  45
  46     public function test_simple_expression_negatives() {
  47         $vs = new qtype_calculated_variable_substituter(array('a' => -1, 'b' => -2), '.');
  48         $this->assertEquals(1, $vs->calculate('{a}-{b}'));
  49     }
  50
  51     /**
  52      * @expectedException moodle_exception
  53      */
  54     public function test_cannot_use_nonnumbers() {
  55         $vs = new qtype_calculated_variable_substituter(array('a' => 'frog', 'b' => -2), '.');
  56     }
  57
  58     /**
  59      * @expectedException moodle_exception
  60      */
  61     public function test_invalid_expression() {
  62         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
  63         $vs->calculate('{a} + {b}?');
  64     }
  65
  66     /**
  67      * @expectedException moodle_exception
  68      */
  69     public function test_tricky_invalid_expression() {
  70         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
  71         $vs->calculate('{a}{b}'); // Have to make sure this does not just evaluate to 12.
  72     }
  73
  74     /**
  75      * @expectedException moodle_exception
  76      */
  77     public function test_division_by_zero_expression() {
  78
  79         if (intval(PHP_VERSION) < 7) {
  80             $this->markTestSkipped('Division by zero triggers a PHP warning before PHP 7.');
  81         }
  82
  83         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 0), '.');
  84         $vs->calculate('{a} / {b}');
  85     }
  86
  87     public function test_replace_expressions_in_text_simple_var() {
  88         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
  89         $this->assertEquals('1 + 2', $vs->replace_expressions_in_text('{a} + {b}'));
  90     }
  91
  92     public function test_replace_expressions_in_confusing_text() {
  93         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
  94         $this->assertEquals("(1) 1\n(2) 2", $vs->replace_expressions_in_text("(1) {a}\n(2) {b}"));
  95     }
  96
  97     public function test_replace_expressions_in_text_formula() {
  98         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
  99         $this->assertEquals('= 3', $vs->replace_expressions_in_text('= {={a} + {b}}'));
 100     }
 101
 102     public function test_expression_has_unmapped_placeholder() {
 103         $this->expectException('moodle_exception');
 104         $this->expectExceptionMessage(get_string('illegalformulasyntax', 'qtype_calculated', '{c}'));
 105         $vs = new qtype_calculated_variable_substituter(array('a' => 1, 'b' => 2), '.');
 106         $vs->calculate('{c} - {a} + {b}');
 107     }
 108
 109     public function test_replace_expressions_in_text_negative() {
 110         $vs = new qtype_calculated_variable_substituter(array('a' => -1, 'b' => 2), '.');
 111         $this->assertEquals('temperatures -1 and 2',
 112                 $vs->replace_expressions_in_text('temperatures {a} and {b}'));
 113     }
 114
 115     public function test_replace_expressions_in_text_commas_for_decimals() {
 116         $vs = new qtype_calculated_variable_substituter(
 117                 array('phi' => 1.61803399, 'pi' => 3.14159265), ',');
 118         $this->assertEquals('phi (1,61803399) + pi (3,14159265) = 4,75962664',
 119                 $vs->replace_expressions_in_text('phi ({phi}) + pi ({pi}) = {={phi} + {pi}}'));
 120     }
 121
 122     public function test_format_float_dot() {
 123         $vs = new qtype_calculated_variable_substituter(array('a' => -1, 'b' => 2), '.');
 124         $this->assertSame('0.12345', $vs->format_float(0.12345));
 125
 126         $this->assertSame('0', $vs->format_float(0.12345, 0, 1));
 127         $this->assertSame('0.12', $vs->format_float(0.12345, 2, 1));
 128         $this->assertSame('0.1235', $vs->format_float(0.12345, 4, 1));
 129
 130         $this->assertSame('0.12', $vs->format_float(0.12345, 2, 2));
 131         $this->assertSame('0.0012', $vs->format_float(0.0012345, 4, 1));
 132     }
 133
 134     public function test_format_float_comma() {
 135         $vs = new qtype_calculated_variable_substituter(array('a' => -1, 'b' => 2), ',');
 136         $this->assertSame('0,12345', $vs->format_float(0.12345));
 137
 138         $this->assertSame('0', $vs->format_float(0.12345, 0, 1));
 139         $this->assertSame('0,12', $vs->format_float(0.12345, 2, 1));
 140         $this->assertSame('0,1235', $vs->format_float(0.12345, 4, 1));
 141
 142         $this->assertSame('0,12', $vs->format_float(0.12345, 2, 2));
 143         $this->assertSame('0,0012', $vs->format_float(0.0012345, 4, 1));
 144     }
 145 }