@mojaloop/central-services-shared/test/unit/healthCheck/HealthCheck.test.js

Shared code for mojaloop central services

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 License
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 The Mojaloop files are made available by the Mojaloop Foundation under the Apache License, Version 2.0 (the "License") and you may not use these files except in compliance with the License. You may obtain a copy of the License at

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'use strict'

const Test = require('tapes')(require('tape'))
const Sinon = require('sinon')
const Joi = require('joi')

const HealthCheck = require('../../../src/healthCheck').HealthCheck

Test('HealthCheck test', healthCheckTest => {
  let sandbox

  healthCheckTest.beforeEach(t => {
    sandbox = Sinon.createSandbox()
    t.end()
  })

  healthCheckTest.afterEach(t => {
    sandbox.restore()
    t.end()
  })

  healthCheckTest.test('getHealth', getHealthTest => {
    getHealthTest.test('gets the health with empty serviceChecks', async test => {
      // Arrange
      const healthCheck = new HealthCheck({ version: '1.0.0' }, [])
      const schema = Joi.compile({
        status: Joi.string().valid('OK').required(),
        uptime: Joi.number().required(),
        startTime: Joi.date().iso().required(),
        versionNumber: Joi.string().required(),
        services: Joi.array().required()
      })
      const expectedServices = []

      // Act
      const response = await healthCheck.getHealth()

      // Assert
      const validationResult = Joi.attempt(response, schema) // We use Joi to validate the results as they rely on timestamps that are variable
      test.equal(validationResult.error, undefined, 'The response matches the validation schema')
      test.deepEqual(response.services, expectedServices, 'The sub-services are correct')
      test.end()
    })

    getHealthTest.test('gets the health with two sub-services', async test => {
      // Arrange
      const healthCheck = new HealthCheck({ version: '1.0.0' }, [
        async () => ({ name: 'datastore', status: 'OK' }),
        async () => ({ name: 'broker', status: 'OK' })
      ])
      const schema = Joi.compile({
        status: Joi.string().valid('OK').required(),
        uptime: Joi.number().required(),
        startTime: Joi.date().iso().required(),
        versionNumber: Joi.string().required(),
        services: Joi.array().required()
      })
      const expectedServices = [
        { name: 'datastore', status: 'OK' },
        { name: 'broker', status: 'OK' }
      ]

      // Act
      const response = await healthCheck.getHealth()

      // Assert
      const validationResult = Joi.attempt(response, schema) // We use Joi to validate the results as they rely on timestamps that are variable
      test.equal(validationResult.error, undefined, 'The response matches the validation schema')
      test.deepEqual(response.services, expectedServices, 'The sub-services are correct')
      test.end()
    })

    getHealthTest.test('is down if a sub-service check throws', async test => {
      // Arrange
      const healthCheck = new HealthCheck({ version: '1.0.0' }, [
        async () => { throw new Error('Get health failed') },
        async () => ({ name: 'broker', status: 'OK' })
      ])
      const schema = Joi.compile({
        status: Joi.string().valid('DOWN').required(),
        uptime: Joi.number().required(),
        startTime: Joi.date().iso().required(),
        versionNumber: Joi.string().required()
      })

      // Act
      const response = await healthCheck.getHealth()

      // Assert
      const validationResult = Joi.attempt(response, schema) // We use Joi to validate the results as they rely on timestamps that are variable
      test.equal(validationResult.error, undefined, 'The response matches the validation schema')
      test.end()
    })

    getHealthTest.end()
  })

  healthCheckTest.test('evaluateServiceHealth', evaluateServiceHealthTest => {
    evaluateServiceHealthTest.test('passes if there are no services', async test => {
      // Arrange
      const services = []
      const expected = true

      // Act
      const result = HealthCheck.evaluateServiceHealth(services)

      // Assert
      test.equal(result, expected, 'Service should be healthy')
      test.end()
    })

    evaluateServiceHealthTest.test('passes if nothing is down', async test => {
      // Arrange
      const services = [
        { name: 'datastore', status: 'OK' },
        { name: 'broker', status: 'OK' }
      ]
      const expected = true

      // Act
      const result = HealthCheck.evaluateServiceHealth(services)

      // Assert
      test.equal(result, expected, 'Service should be healthy')
      test.end()
    })

    evaluateServiceHealthTest.test('fails if anything is down', async test => {
      // Arrange
      const services = [
        { name: 'broker', status: 'DOWN' },
        { name: 'datastore', status: 'OK' }
      ]
      const expected = false

      // Act
      const result = HealthCheck.evaluateServiceHealth(services)

      // Assert
      test.equal(result, expected, 'Service should be unhealthy')
      test.end()
    })

    evaluateServiceHealthTest.end()
  })

  healthCheckTest.end()
})