@eluvio/elv-js-helpers/test/unit/src/ModelAssertion/assertNeighborsPass.test.js

A collection of Javascript helper functions used by several Eluvio libraries.

const TH = require('../../../test-helpers')
const assertNeighborsPass = TH.requireSrcFile('ModelAssertion/assertNeighborsPass')

describe('assertNeighborsPass', () => {
  it('should work as expected', () => {
    const defBasicModel = TH.requireSrcFile('ModelFactory/defBasicModel')
    const kind = TH.requireSrcFile('Validation/kind')

    // Note use of spread operator (...) to unpack the array returned by assertNeighborsPass()
    const ArrayAllSameKindModel = defBasicModel('ArrayAllSameKindModel', Array).extend()
      .assert(
        ...assertNeighborsPass(
          (x, y) => kind(x) === kind(y),
          'elements are not all of the same kind'
        )
      )

    ArrayAllSameKindModel([1, 2, 3]).should.eql([1, 2, 3])
    ArrayAllSameKindModel([]).should.eql([])
    TH.expect(() => ArrayAllSameKindModel([42, 'a'])).to.throw('Value elements are not all of the same kind (got: [42,"a"])')
    TH.expect(() => ArrayAllSameKindModel('foo')).to.throw('expecting Array, got String "foo"')
  })
})