simple-squiggle

A restricted subset of Squiggle
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convert.test.js (1359B)

      1 var assert = require('assert');
      2 var typed = require('../typed-function');
      3 
      4 describe('convert', function () {
      5 
      6   before(function () {
      7     typed.conversions = [
      8       {from: 'boolean', to: 'number', convert: function (x) {return +x;}},
      9       {from: 'boolean', to: 'string', convert: function (x) {return x + '';}},
     10       {from: 'number',  to: 'string', convert: function (x) {return x + '';}},
     11       {
     12         from: 'string',
     13         to: 'Date',
     14         convert: function (x) {
     15           var d = new Date(x);
     16           return isNaN(d.valueOf()) ? undefined : d;
     17         },
     18         fallible: true // TODO: not yet supported
     19       }
     20     ];
     21   });
     22 
     23   after(function () {
     24     // cleanup conversions
     25     typed.conversions = [];
     26   });
     27 
     28   it('should convert a value', function() {
     29     assert.strictEqual(typed.convert(2, 'string'), '2');
     30     assert.strictEqual(typed.convert(true, 'string'), 'true');
     31     assert.strictEqual(typed.convert(true, 'number'), 1);
     32   });
     33   
     34   it('should return same value when conversion is not needed', function () {
     35     assert.strictEqual(typed.convert(2, 'number'), 2);
     36     assert.strictEqual(typed.convert(true, 'boolean'), true);
     37   });
     38 
     39   it('should throw an error when no conversion function is found', function() {
     40     assert.throws(function () {typed.convert(2, 'boolean')}, /Error: Cannot convert from number to boolean/);
     41   });
     42 });