test cases for isVersionAddedGreater(a, b)

testcases.js

const assert = require('assert');

const compareVersions = require('compare-versions');

function isVersionAddedGreater(a, b) {
  var a_version_added = a;
  var b_version_added = b;
  if (
    typeof a_version_added === 'string' &&
    typeof b_version_added === 'string'
  ) {
    if (b_version_added.startsWith('≤')) {
      return false;
    }
    return compareVersions.compare(
      a_version_added.replace('≤', ''),
      b_version_added,
      '<',
    );
  }

  return false;
}

describe('isVersionAddedGreater', function() {
  it('fixed versions compare as numbers', function() {
    assert.strictEqual(isVersionAddedGreater('2', '9'), true);
    assert.strictEqual(isVersionAddedGreater('9', '2'), false);
    assert.strictEqual(isVersionAddedGreater('0', '2'), true);
    assert.strictEqual(isVersionAddedGreater('2', '0'), false);
    assert.strictEqual(isVersionAddedGreater('0', '0'), false);
  });

  it('fixed versions compare to ranged versions', () => {
    assert.strictEqual(isVersionAddedGreater('2', '≤9'), false); // meaning, [2 is less than any value 0 to 9, inclusive] => false
    assert.strictEqual(isVersionAddedGreater('≤2', '9'), true); // meaning, [any value 0 to 2, inclusive, is less than 9] => true
  });

  it('ranged versions compare to ranged versions', () => {
    assert.strictEqual(isVersionAddedGreater('≤2', '≤9'), false); // meaning, [every value 0-2 is less than every value 0-9] => false (because 0 < 0 is false and is always a consequence of comparing two ranged versions)
  });
});