robonen
96f4cba4a8
- Add array/async/etc. modules and type tests; migrate to eslint flat config and composite tsconfig (vitest typecheck enabled). - Fix PubSub.emit to snapshot listeners before iterating (stable EventEmitter semantics; avoids invoking listeners added during the same emit).
101 lines
2.7 KiB
TypeScript
101 lines
2.7 KiB
TypeScript
import { describe, expect, it } from 'vitest';
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import { trigramDistance, trigramProfile } from '.';
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describe('trigramProfile', () => {
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it('trigram profile of a text with different trigrams', () => {
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const different_trigrams = 'hello world';
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const profile1 = trigramProfile(different_trigrams);
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expect(profile1).toEqual(new Map([
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['\n\nh', 1],
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['\nhe', 1],
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['hel', 1],
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['ell', 1],
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['llo', 1],
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['lo ', 1],
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['o w', 1],
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[' wo', 1],
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['wor', 1],
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['orl', 1],
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['rld', 1],
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['ld\n', 1],
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['d\n\n', 1],
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]));
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});
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it('trigram profile of a text with repeated trigrams', () => {
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const repeated_trigrams = 'hello hello';
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const profile2 = trigramProfile(repeated_trigrams);
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expect(profile2).toEqual(new Map([
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['\n\nh', 1],
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['\nhe', 1],
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['hel', 2],
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['ell', 2],
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['llo', 2],
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['lo ', 1],
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['o h', 1],
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[' he', 1],
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['lo\n', 1],
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['o\n\n', 1],
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]));
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});
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it('trigram profile of an empty text', () => {
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const text = '';
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const profile = trigramProfile(text);
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expect(profile).toEqual(new Map([
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['\n\n\n', 2],
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]));
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});
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});
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describe('trigramDistance', () => {
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it('zero when comparing the same text', () => {
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const profile1 = trigramProfile('hello world');
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const profile2 = trigramProfile('hello world');
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expect(trigramDistance(profile1, profile2)).toBe(0);
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});
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it('one for completely different text', () => {
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const profile1 = trigramProfile('hello world');
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const profile2 = trigramProfile('lorem ipsum');
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expect(trigramDistance(profile1, profile2)).toBe(1);
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});
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it('is symmetric', () => {
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const a = trigramProfile('hello world');
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const b = trigramProfile('hello lorem');
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expect(trigramDistance(a, b)).toBe(trigramDistance(b, a));
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});
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it('one for empty text and non-empty text', () => {
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const profile1 = trigramProfile('hello world');
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const profile2 = trigramProfile('');
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expect(trigramDistance(profile1, profile2)).toBe(1);
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});
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it('approximately 0.5 for similar text', () => {
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const profile1 = trigramProfile('hello world');
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const profile2 = trigramProfile('hello lorem');
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const approx = trigramDistance(profile1, profile2);
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expect(approx).toBeGreaterThan(0.45);
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expect(approx).toBeLessThan(0.55);
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});
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it('triangle inequality', () => {
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const A = trigramDistance(trigramProfile('metric'), trigramProfile('123ric'));
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const B = trigramDistance(trigramProfile('123ric'), trigramProfile('123456'));
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const C = trigramDistance(trigramProfile('metric'), trigramProfile('123456'));
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expect(A + B).toBeGreaterThanOrEqual(C);
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});
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});
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