line.js

import {diffLines, diffTrimmedLines} from '../../lib/diff/line';
import {convertChangesToXML} from '../../lib/convert/xml';

import {expect} from 'chai';

describe('diff/line', function() {
  // Line Diff
  describe('#diffLines', function() {
    it('should diff lines', function() {
      const diffResult = diffLines(
        'line\nold value\nline',
        'line\nnew value\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\n<del>old value\n</del><ins>new value\n</ins>line');
    });
    it('should the same lines in diff', function() {
      const diffResult = diffLines(
        'line\nvalue\nline',
        'line\nvalue\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\nvalue\nline');
    });

    it('should handle leading and trailing whitespace', function() {
      const diffResult = diffLines(
        'line\nvalue \nline',
        'line\nvalue\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\n<del>value \n</del><ins>value\n</ins>line');
    });

    it('should handle windows line endings', function() {
      const diffResult = diffLines(
        'line\r\nold value \r\nline',
        'line\r\nnew value\r\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\r\n<del>old value \r\n</del><ins>new value\r\n</ins>line');
    });

    it('should handle empty lines', function() {
      const diffResult = diffLines(
        'line\n\nold value \n\nline',
        'line\n\nnew value\n\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\n\n<del>old value \n</del><ins>new value\n</ins>\nline');
    });

    it('should handle empty input', function() {
      const diffResult = diffLines(
        'line\n\nold value \n\nline',
        '');
      expect(convertChangesToXML(diffResult)).to.equal('<del>line\n\nold value \n\nline</del>');
    });

    describe('given options.maxEditLength', function() {
      it('terminates early', function() {
        const diffResult = diffLines(
          'line\nold value\nline',
          'line\nnew value\nline', { maxEditLength: 1 });
        expect(diffResult).to.be.undefined;
      });
      it('terminates early - async', function(done) {
        function callback(diffResult) {
          expect(diffResult).to.be.undefined;
          done();
        }
        diffLines(
          'line\nold value\nline',
          'line\nnew value\nline', { callback, maxEditLength: 1 });
      });
    });
  });

  // Trimmed Line Diff
  describe('#TrimmedLineDiff', function() {
    it('should diff lines', function() {
      const diffResult = diffTrimmedLines(
        'line\nold value\nline',
        'line\nnew value\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\n<del>old value\n</del><ins>new value\n</ins>line');
    });
    it('should the same lines in diff', function() {
      const diffResult = diffTrimmedLines(
        'line\nvalue\nline',
        'line\nvalue\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\nvalue\nline');
    });

    it('should ignore leading and trailing whitespace', function() {
      const diffResult = diffTrimmedLines(
        'line\nvalue \nline',
        'line\nvalue\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\nvalue\nline');
    });

    it('should handle windows line endings', function() {
      const diffResult = diffTrimmedLines(
        'line\r\nold value \r\nline',
        'line\r\nnew value\r\nline');
      expect(convertChangesToXML(diffResult)).to.equal('line\r\n<del>old value\r\n</del><ins>new value\r\n</ins>line');
    });
  });

  describe('#diffLinesNL', function() {
    expect(diffLines('restaurant', 'restaurant\n', {newlineIsToken: true})).to.eql([
      {value: 'restaurant', count: 1},
      {value: '\n', count: 1, added: true, removed: undefined}
    ]);
    expect(diffLines('restaurant', 'restaurant\nhello', {newlineIsToken: true})).to.eql([
      {value: 'restaurant', count: 1},
      {value: '\nhello', count: 2, added: true, removed: undefined}
    ]);
  });
});