hunk.code_window:       [3, 3, s],
       ]);
     });
     it('unions two sets', () => {
       const s1 = Set.of('a', 'b', 'c');
       const s2 = Set.of('d', 'b', 'wow');
       const s3 = s1.union(s2);
       expect(s3.toArray()).toEqual(['a', 'b', 'c', 'd', 'wow']);
  
hunk.labels: keep keep keep add keep keep keep keep keep
hunk.after_edit:   it('has the same iterator function for keys and values', () => {
       const s = Set([1, 2, 3]);
       expect(s[Symbol.iterator]).toBe(s.keys);
       expect(s[Symbol.iterator]).toBe(s.values);
     });
  
hunk.file_path: __tests__/Set.ts
hunk.type: add
file: // Jest Snapshot v1, https://goo.gl/fbAQLP
  
  exports[`Record does not accept a Record as constructor 1`] = `"Can not call \`Record\` with an immutable Record as default values. Use a plain javascript object instead."`;
  
  exports[`Record does not accept a non object as constructor 1`] = `"Can not call \`Record\` with a non-object as default values. Use a plain javascript object instead."`;
  
  exports[`Record does not accept an immutable object that is not a Record as constructor 1`] = `"Can not call \`Record\` with an immutable Collection as default values. Use a plain javascript object instead."`;
  