Oscar Test Data Generation

OSCAR Test Data Generation

This skill provides patterns for generating realistic synthetic CPAP/sleep therapy test data for the OSCAR Export Analyzer project. All test data should be synthetic—never use real patient information.

Core Builders

The project provides builder functions in src/test-utils/builders.js for generating test data:

Session Builder

import { buildSession } from '../test-utils/builders';

// Build a single CPAP session with custom values
const session = buildSession({
  date: '2024-01-15',
  ahi: 8.5,
  epap: 9.0,
  usage: 7.2,
  leak: 12.5,
});

// Build multiple sessions
const sessions = Array.from({ length: 30 }, (_, i) =>
  buildSession({
    date: new Date(2024, 0, i + 1).toISOString().split('T')[0],
    ahi: 5 + Math.random() * 10,
    epap: 8 + Math.random() * 2,
    usage: 6 + Math.random() * 3,
  }),
);

Fitbit Data Builder

import {
  buildFitbitHeartRate,
  buildFitbitSleepStage,
} from '../test-utils/fitbitBuilders';

// Heart rate data
const hrData = buildFitbitHeartRate({
  date: '2024-01-15',
  bpm: 65,
  confidence: 3,
});

// Sleep stage data
const sleepStage = buildFitbitSleepStage({
  date: '2024-01-15',
  level: 'deep',
  seconds: 3600,
});

Common Test Scenarios

High AHI Cases

// Severe sleep apnea scenario
const highAhiSession = buildSession({
  date: '2024-01-15',
  ahi: 42.3, // Severe: > 30
  centralApneas: 15,
  obstructiveApneas: 25,
  hypopneas: 10,
  epap: 10.5,
  usage: 6.8,
  leak: 18.2,
});

Zero Usage / Missing Data

// Night with no therapy
const noUsageSession = buildSession({
  date: '2024-01-16',
  usage: 0,
  ahi: null, // No AHI when not used
  epap: null,
});

Edge Case Values

// Boundary values for validation testing
const edgeCases = [
  buildSession({ ahi: 0, epap: 4.0 }), // Minimum values
  buildSession({ ahi: 150, epap: 25 }), // Maximum values
  buildSession({ ahi: -1 }), // Invalid: negative
  buildSession({ date: 'invalid-date' }), // Invalid date format
];

Time-Series Patterns

// Therapy adjustment period (ramping up pressure)
const titrationPeriod = Array.from({ length: 14 }, (_, i) =>
  buildSession({
    date: new Date(2024, 0, i + 1).toISOString().split('T')[0],
    epap: 7 + i * 0.3, // Gradual increase
    ahi: 15 - i * 0.8, // Improving AHI
    usage: 7 + Math.random() * 0.5,
  }),
);

// Weekly pattern (worse on weekends)
const weeklyPattern = Array.from({ length: 30 }, (_, i) => {
  const dayOfWeek = i % 7;
  const isWeekend = dayOfWeek === 5 || dayOfWeek === 6;

  return buildSession({
    date: new Date(2024, 0, i + 1).toISOString().split('T')[0],
    ahi: isWeekend ? 12 + Math.random() * 5 : 6 + Math.random() * 3,
    usage: isWeekend ? 5 + Math.random() * 2 : 7 + Math.random() * 1,
  });
});

Correlation Scenarios (CPAP + Fitbit)

// Correlated CPAP and Fitbit data
const correlatedNight = {
  cpap: buildSession({
    date: '2024-01-15',
    ahi: 25.3,
    usage: 7.2,
    epap: 9.0,
  }),
  fitbit: {
    heartRate: Array.from({ length: 24 }, (_, hour) =>
      buildFitbitHeartRate({
        date: '2024-01-15',
        time: `${hour}:30:00`,
        bpm: 60 + (hour < 6 || hour > 22 ? 0 : 15), // Lower during sleep
      }),
    ),
    sleepStages: [
      buildFitbitSleepStage({
        date: '2024-01-15',
        level: 'light',
        seconds: 3600,
      }),
      buildFitbitSleepStage({
        date: '2024-01-15',
        level: 'deep',
        seconds: 2400,
      }),
      buildFitbitSleepStage({
        date: '2024-01-15',
        level: 'rem',
        seconds: 1800,
      }),
    ],
  },
};

CSV Export Generation

// Generate CSV string for upload testing
function generateCsvFromSessions(sessions) {
  const headers = ['Date', 'AHI', 'EPAP', 'Usage (hours)', 'Leak Rate'];
  const rows = sessions.map((s) =>
    [s.date, s.ahi, s.epap, s.usage, s.leak].join(','),
  );

  return [headers.join(','), ...rows].join('\n');
}

const csvContent = generateCsvFromSessions(sessions);

Security Reminders

NEVER use real patient data in test files:

• ❌ Don't copy real OSCAR CSV exports
• ❌ Don't use actual AHI values from real patients
• ❌ Don't include real timestamps or identifiable patterns
• ✅ Use synthetic data with builder functions
• ✅ Document test scenarios by description ("high AHI case"), not values
• ✅ Generate random but realistic values

Test Constants

// Medical reference values (from testConstants.js)
export const MEDICAL_THRESHOLDS = {
  AHI_NORMAL: 5,
  AHI_MILD: 15,
  AHI_MODERATE: 30,
  EPAP_MIN: 4.0,
  EPAP_MAX: 25.0,
  USAGE_COMPLIANT: 4.0, // Hours per night
};

Resources

• Builder API: src/test-utils/builders.js
• Fitbit builders: src/test-utils/fitbitBuilders.js
• Test constants: src/test-utils/testConstants.js
• Mock hooks: src/test-utils/mockHooks.js
• Fixtures: src/test-utils/fixtures/

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