json-canonicalize/src/__tests__/canonicalize.spec.ts

JSON canonicalize function

// tslint:disable max-line-length
// tslint:disable no-magic-numbers
import { canonicalize } from '../canonicalize'

describe('json canonicalize', () => {
  it('should canonicalize primary types', () => {
    const obj = {
      text: '你好',
      num: 47734.12,
      dt: new Date('2018-12-17T01:08:19.719Z'),
      arr: [56, 'a', '12', { t: '455A', a: 123 }],
    }
    expect(canonicalize(obj)).toEqual(
      '{"arr":[56,"a","12",{"a":123,"t":"455A"}],"dt":"2018-12-17T01:08:19.719Z","num":47734.12,"text":"你好"}'
    )
  })
  it('should canonicalize object attribute undefined', () => {
    const obj = {
      text: undefined,
      num: 47734.12,
      dt: new Date('2018-12-17T01:08:19.719Z'),
      arr: [56, 'a', '12', { t: '455A', a: 123 }],
    }
    expect(canonicalize(obj)).toEqual(
      '{"arr":[56,"a","12",{"a":123,"t":"455A"}],"dt":"2018-12-17T01:08:19.719Z","num":47734.12}'
    )
  })
  it('should canonicalize array item undefined', () => {
    const obj = {
      arr: [undefined, null, 56, 'a', '12', { t: '455A', a: 123 }],
    }
    expect(canonicalize(obj)).toEqual(
      '{"arr":[null,null,56,"a","12",{"a":123,"t":"455A"}]}'
    )
  })

  it('should throw error when canonicalize array item circular ref', () => {
    const obj: any = {
      arr: [undefined, null, 56, 'a', '12', { t: '455A', a: 123 }],
    }
    obj.arr.push(obj.arr);
    expect(() => canonicalize(obj)).toThrow('Circular reference detected')
  })

  it('should allow canonicalize array item circular ref', () => {
    const obj: any = {
      arr: [undefined, null, 56, 'a', '12', { t: '455A', a: 123 }],
    }
    obj.arr.push(obj.arr);
    expect(canonicalize(obj, true)).toEqual(
      '{"arr":[null,null,56,"a","12",{"a":123,"t":"455A"},"[Circular:$.arr]"]}'
    )
  })

  it('should throw error when canonicalize obj item circular ref', () => {
    const obj: any = {
      text: undefined,
      num: 47734.12,
      dt: new Date('2018-12-17T01:08:19.719Z'),
      arr: [56, 'a', '12', { t: '455A', a: 123 }],
    }
    obj.cir = obj;
    // expect(canonicalize(obj)).toEqual(
    //   '{"arr":[56,"a","12",{"a":123,"t":"455A"}],"dt":"2018-12-17T01:08:19.719Z","num":47734.12}'
    // )

    expect(() => canonicalize(obj)).toThrow('Circular reference detected')
  })

  it('should allow canonicalize obj item circular ref', () => {
    const obj: any = {
      text: undefined,
      num: 47734.12,
      dt: new Date('2018-12-17T01:08:19.719Z'),
      arr: [56, 'a', '12', { t: '455A', a: 123 }],
    }
    obj.cir = obj;
    expect(canonicalize(obj, true)).toEqual(
      '{"arr":[56,"a","12",{"a":123,"t":"455A"}],"cir":"[Circular:$]","dt":"2018-12-17T01:08:19.719Z","num":47734.12}'
    )

  })

  it('should allow canonicalize obj item circular ref2', () => {
    const obj: any = {
      text: undefined,
      num: 47734.12,
      dt: new Date('2018-12-17T01:08:19.719Z'),
      arr: [56, 'a', '12', { t: '455A', a: 123 }],
    }
    obj.cir = obj;
    obj.arr.push(obj)
    expect(canonicalize(obj, true)).toEqual(
      '{"arr":[56,"a","12",{"a":123,"t":"455A"},"[Circular:$]"],"cir":"[Circular:$]","dt":"2018-12-17T01:08:19.719Z","num":47734.12}'
    )

  })

  it('should not treat two references to the same sub-object as a circular reference', () => {
    const sharedObject = { key: 'value' };
    const obj = {
      a: sharedObject,
      b: sharedObject
    };
    expect(canonicalize(obj)).toEqual('{"a":{"key":"value"},"b":{"key":"value"}}');
  });

  it('should not treat two references to the same sub-object in an array as a circular reference', () => {
    const sharedObject = { key: 'value' };
    const obj = {
      arr: [sharedObject, sharedObject]
    };
    expect(canonicalize(obj)).toEqual('{"arr":[{"key":"value"},{"key":"value"}]}');
  });

  it('should not treat two references to the same sub-array as a circular reference', () => {
    const sharedArray = [1, 2];
    const obj = {
      a: sharedArray,
      b: sharedArray
    };
    expect(canonicalize(obj)).toEqual('{"a":[1,2],"b":[1,2]}');
  });

  it('should not treat two references to the same sub-array as a circular reference2', () => {
    const sharedArray = [1, 2];
    const obj = {
      a: [sharedArray],
      b: sharedArray
    };
    expect(canonicalize(obj)).toEqual('{"a":[[1,2]],"b":[1,2]}');
  });

})