fingerprintjs

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import { withMockProperties } from '../../tests/utils'
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import getDeviceMemory from './device_memory'
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describe('Sources', () => {
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  describe('deviceMemory', () => {
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    it('returns number or undefined for the current browser', () => {
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      const deviceMemory = getDeviceMemory()
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      expect(['number', 'undefined'].indexOf(typeof deviceMemory)).not.toBe(-1)
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      if (typeof deviceMemory === 'number') {
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        expect(deviceMemory).not.toBeNaN()
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        expect(deviceMemory).toBeGreaterThan(0)
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      }
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    })
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    it('handles numeric values', async () => {
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      // Configuring the mock property as `{ value: 8 }` doesn't work in old browsers.
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      await withMockProperties(navigator, { deviceMemory: { get: () => 8 } }, () => {
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        expect(getDeviceMemory()).toBe(8)
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      })
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    })
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    it('handles undefined values', async () => {
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      await withMockProperties(navigator, { deviceMemory: { get: () => undefined } }, () => {
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        expect(getDeviceMemory()).toBeUndefined()
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      })
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    })
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    // Some browsers return a string value for `deviceMemory`.
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    // This test checks that it's fetched as a number regardless.
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    it('converts fake string value to number', async () => {
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      await withMockProperties(navigator, { deviceMemory: { get: () => '4' } }, () => {
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        expect(getDeviceMemory()).toBe(4)
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      })
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    })
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  })
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})
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