semantic-ds-toolkit/dist/test/drift/pattern-drift.test.js

Performance-first semantic layer for modern data stacks - Stable Column Anchors & intelligent inference

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const pattern_drift_1 = require("../../src/drift/pattern-drift");
describe('Drift: PatternDriftDetector', () => {
    const detector = new pattern_drift_1.PatternDriftDetector();
    function fp(sample, regex = []) {
        return {
            dtype: 'string',
            cardinality: new Set(sample).size,
            regex_patterns: regex,
            null_ratio: 0,
            unique_ratio: 0.9,
            sample_values: sample
        };
    }
    it('detects pattern drift when formats change significantly', async () => {
        const historical = fp([
            'john.smith@example.com',
            'jane.doe@company.org',
            'user+1@service.io',
            'alpha.beta@test.net',
            'person@example.co'
        ]);
        const current = fp([
            '2024-01-01',
            '2024-02-15',
            '2023-12-31',
            '2022-07-04',
            '2024-06-30'
        ]);
        const drift = await detector.detectPatternDrift(historical, current, 0.85);
        expect(drift).not.toBeNull();
        expect(drift.type).toBe('format');
    });
});
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