text: 'use strict';
  
  var tap = require('tap');
  var test = tap.test;
  var semver = require('../semver.js');
  var eq = semver.eq;
  var gt = semver.gt;
  var lt = semver.lt;
  var neq = semver.neq;
  var cmp = semver.cmp;
  var gte = semver.gte;
  var lte = semver.lte;
  var satisfies = semver.satisfies;
  var validRange = semver.validRange;
  var inc = semver.inc;
  var diff = semver.diff;
  var replaceStars = semver.replaceStars;
  var toComparators = semver.toComparators;
  var SemVer = semver.SemVer;
  var Range = semver.Range;
  
  test('\ncomparison tests', function(t) {
    // [version1, version2]
    // version1 should be greater than version2
    [['0.0.0', '0.0.0-foo'],
      ['0.0.1', '0.0.0'],
      ['1.0.0', '0.9.9'],
      ['0.10.0', '0.9.0'],
      ['0.99.0', '0.10.0'],
      ['2.0.0', '1.2.3'],
      ['v0.0.0', '0.0.0-foo', true],
      ['v0.0.1', '0.0.0', true],
      ['v1.0.0', '0.9.9', true],
      ['v0.10.0', '0.9.0', true],
      ['v0.99.0', '0.10.0', true],
      ['v2.0.0', '1.2.3', true],
      ['0.0.0', 'v0.0.0-foo', true],
      ['0.0.1', 'v0.0.0', true],
      ['1.0.0', 'v0.9.9', true],
      ['0.10.0', 'v0.9.0', true],
      ['0.99.0', 'v0.10.0', true],
      ['2.0.0', 'v1.2.3', true],
      ['1.2.3', '1.2.3-asdf'],
      ['1.2.3', '1.2.3-4'],
      ['1.2.3', '1.2.3-4-foo'],
      ['1.2.3-5-foo', '1.2.3-5'],
      ['1.2.3-5', '1.2.3-4'],
      ['1.2.3-5-foo', '1.2.3-5-Foo'],
      ['3.0.0', '2.7.2+asdf'],
      ['1.2.3-a.10', '1.2.3-a.5'],
      ['1.2.3-a.b', '1.2.3-a.5'],
      ['1.2.3-a.b', '1.2.3-a'],
      ['1.2.3-a.b.c.10.d.5', '1.2.3-a.b.c.5.d.100'],
      ['1.2.3-r2', '1.2.3-r100'],
      ['1.2.3-r100', '1.2.3-R2']
    ].forEach(function(v) {
      var v0 = v[0];
      var v1 = v[1];
      var loose = v[2];
      t.ok(gt(v0, v1, loose), "gt('" + v0 + "', '" + v1 + "')");
      t.ok(lt(v1, v0, loose), "lt('" + v1 + "', '" + v0 + "')");
      t.ok(!gt(v1, v0, loose), "!gt('" + v1 + "', '" + v0 + "')");
      t.ok(!lt(v0, v1, loose), "!lt('" + v0 + "', '" + v1 + "')");
      t.ok(eq(v0, v0, loose), "eq('" + v0 + "', '" + v0 + "')");
      t.ok(eq(v1, v1, loose), "eq('" + v1 + "', '" + v1 + "')");
      t.ok(neq(v0, v1, loose), "neq('" + v0 + "', '" + v1 + "')");
      t.ok(cmp(v1, '==', v1, loose), "cmp('" + v1 + "' == '" + v1 + "')");
      t.ok(cmp(v0, '>=', v1, loose), "cmp('" + v0 + "' >= '" + v1 + "')");
      t.ok(cmp(v1, '<=', v0, loose), "cmp('" + v1 + "' <= '" + v0 + "')");
      t.ok(cmp(v0, '!=', v1, loose), "cmp('" + v0 + "' != '" + v1 + "')");
    });
    t.end();
  });
  
  test('\nequality tests', function(t) {
    // [version1, version2]
    // version1 should be equivalent to version2
    [['1.2.3', 'v1.2.3', true],
      ['1.2.3', '=1.2.3', true],
      ['1.2.3', 'v 1.2.3', true],
      ['1.2.3', '= 1.2.3', true],
      ['1.2.3', ' v1.2.3', true],
      ['1.2.3', ' =1.2.3', true],
      ['1.2.3', ' v 1.2.3', true],
      ['1.2.3', ' = 1.2.3', true],
      ['1.2.3-0', 'v1.2.3-0', true],
      ['1.2.3-0', '=1.2.3-0', true],
      ['1.2.3-0', 'v 1.2.3-0', true],
      ['1.2.3-0', '= 1.2.3-0', true],
      ['1.2.3-0', ' v1.2.3-0', true],
      ['1.2.3-0', ' =1.2.3-0', true],
      ['1.2.3-0', ' v 1.2.3-0', true],
      ['1.2.3-0', ' = 1.2.3-0', true],
      ['1.2.3-1', 'v1.2.3-1', true],
      ['1.2.3-1', '=1.2.3-1', true],
      ['1.2.3-1', 'v 1.2.3-1', true],
      ['1.2.3-1', '= 1.2.3-1', true],
      ['1.2.3-1', ' v1.2.3-1', true],
      ['1.2.3-1', ' =1.2.3-1', true],
      ['1.2.3-1', ' v 1.2.3-1', true],
      ['1.2.3-1', ' = 1.2.3-1', true],
      ['1.2.3-beta', 'v1.2.3-beta', true],
      ['1.2.3-beta', '=1.2.3-beta', true],
      ['1.2.3-beta', 'v 1.2.3-beta', true],
      ['1.2.3-beta', '= 1.2.3-beta', true],
      ['1.2.3-beta', ' v1.2.3-beta', true],
      ['1.2.3-beta', ' =1.2.3-beta', true],
      ['1.2.3-beta', ' v 1.2.3-beta', true],
      ['1.2.3-beta', ' = 1.2.3-beta', true],
      ['1.2.3-beta+build', ' = 1.2.3-beta+otherbuild', true],
      ['1.2.3+build', ' = 1.2.3+otherbuild', true],
      ['1.2.3-beta+build', '1.2.3-beta+otherbuild'],
      ['1.2.3+build', '1.2.3+otherbuild'],
      ['  v1.2.3+build', '1.2.3+otherbuild']
    ].forEach(function(v) {
      var v0 = v[0];
      var v1 = v[1];
      var loose = v[2];
      t.ok(eq(v0, v1, loose), "eq('" + v0 + "', '" + v1 + "')");
      t.ok(!neq(v0, v1, loose), "!neq('" + v0 + "', '" + v1 + "')");
      t.ok(cmp(v0, '==', v1, loose), 'cmp(' + v0 + '==' + v1 + ')');
      t.ok(!cmp(v0, '!=', v1, loose), '!cmp(' + v0 + '!=' + v1 + ')');
      t.ok(!cmp(v0, '===', v1, loose), '!cmp(' + v0 + '===' + v1 + ')');
      t.ok(cmp(v0, '!==', v1, loose), 'cmp(' + v0 + '!==' + v1 + ')');
      t.ok(!gt(v0, v1, loose), "!gt('" + v0 + "', '" + v1 + "')");
      t.ok(gte(v0, v1, loose), "gte('" + v0 + "', '" + v1 + "')");
      t.ok(!lt(v0, v1, loose), "!lt('" + v0 + "', '" + v1 + "')");
      t.ok(lte(v0, v1, loose), "lte('" + v0 + "', '" + v1 + "')");
    });
    t.end();
  });
  
  
  test('\nrange tests', function(t) {
    // [range, version]
    // version should be included by range
    [['1.0.0 - 2.0.0', '1.2.3'],
      ['^1.2.3+build', '1.2.3'],
      ['^1.2.3+build', '1.3.0'],
      ['1.2.3-pre+asdf - 2.4.3-pre+asdf', '1.2.3'],
      ['1.2.3pre+asdf - 2.4.3-pre+asdf', '1.2.3', true],
      ['1.2.3-pre+asdf - 2.4.3pre+asdf', '1.2.3', true],
      ['1.2.3pre+asdf - 2.4.3pre+asdf', '1.2.3', true],
      ['1.2.3-pre+asdf - 2.4.3-pre+asdf', '1.2.3-pre.2'],
      ['1.2.3-pre+asdf - 2.4.3-pre+asdf', '2.4.3-alpha'],
      ['1.2.3+asdf - 2.4.3+asdf', '1.2.3'],
      ['1.0.0', '1.0.0'],
      ['>=*', '0.2.4'],
      ['', '1.0.0'],
      ['*', '1.2.3'],
      ['*', 'v1.2.3', true],
      ['>=1.0.0', '1.0.0'],
      ['>=1.0.0', '1.0.1'],
      ['>=1.0.0', '1.1.0'],
      ['>1.0.0', '1.0.1'],
      ['>1.0.0', '1.1.0'],
      ['<=2.0.0', '2.0.0'],
      ['<=2.0.0', '1.9999.9999'],
      ['<=2.0.0', '0.2.9'],
      ['<2.0.0', '1.9999.9999'],
      ['<2.0.0', '0.2.9'],
      ['>= 1.0.0', '1.0.0'],
      ['>=  1.0.0', '1.0.1'],
      ['>=   1.0.0', '1.1.0'],
      ['> 1.0.0', '1.0.1'],
      ['>  1.0.0', '1.1.0'],
      ['<=   2.0.0', '2.0.0'],
      ['<= 2.0.0', '1.9999.9999'],
      ['<=  2.0.0', '0.2.9'],
      ['<    2.0.0', '1.9999.9999'],
      ['<\t2.0.0', '0.2.9'],
      ['>=0.1.97', 'v0.1.97', true],
      ['>=0.1.97', '0.1.97'],
      ['0.1.20 || 1.2.4', '1.2.4'],
      ['>=0.2.3 || <0.0.1', '0.0.0'],
      ['>=0.2.3 || <0.0.1', '0.2.3'],
      ['>=0.2.3 || <0.0.1', '0.2.4'],
      ['||', '1.3.4'],
      ['2.x.x', '2.1.3'],
      ['1.2.x', '1.2.3'],
      ['1.2.x || 2.x', '2.1.3'],
      ['1.2.x || 2.x', '1.2.3'],
      ['x', '1.2.3'],
      ['2.*.*', '2.1.3'],
      ['1.2.*', '1.2.3'],
      ['1.2.* || 2.*', '2.1.3'],
      ['1.2.* || 2.*', '1.2.3'],
      ['*', '1.2.3'],
      ['2', '2.1.2'],
      ['2.3', '2.3.1'],
      ['~2.4', '2.4.0'], // >=2.4.0 <2.5.0
      ['~2.4', '2.4.5'],
      ['~>3.2.1', '3.2.2'], // >=3.2.1 <3.3.0,
      ['~1', '1.2.3'], // >=1.0.0 <2.0.0
      ['~>1', '1.2.3'],
      ['~> 1', '1.2.3'],
      ['~1.0', '1.0.2'], // >=1.0.0 <1.1.0,
      ['~ 1.0', '1.0.2'],
      ['~ 1.0.3', '1.0.12'],
      ['>=1', '1.0.0'],
      ['>= 1', '1.0.0'],
      ['<1.2', '1.1.1'],
      ['< 1.2', '1.1.1'],
      ['~v0.5.4-pre', '0.5.5'],
      ['~v0.5.4-pre', '0.5.4'],
      ['=0.7.x', '0.7.2'],
      ['<=0.7.x', '0.7.2'],
      ['>=0.7.x', '0.7.2'],
      ['<=0.7.x', '0.6.2'],
      ['~1.2.1 >=1.2.3', '1.2.3'],
      ['~1.2.1 =1.2.3', '1.2.3'],
      ['~1.2.1 1.2.3', '1.2.3'],
      ['~1.2.1 >=1.2.3 1.2.3', '1.2.3'],
      ['~1.2.1 1.2.3 >=1.2.3', '1.2.3'],
      ['~1.2.1 1.2.3', '1.2.3'],
      ['>=1.2.1 1.2.3', '1.2.3'],
      ['1.2.3 >=1.2.1', '1.2.3'],
      ['>=1.2.3 >=1.2.1', '1.2.3'],
      ['>=1.2.1 >=1.2.3', '1.2.3'],
      ['>=1.2', '1.2.8'],
      ['^1.2.3', '1.8.1'],
      ['^0.1.2', '0.1.2'],
      ['^0.1', '0.1.2'],
      ['^1.2', '1.4.2'],
      ['^1.2 ^1', '1.4.2'],
      ['^1.2.3-alpha', '1.2.3-pre'],
      ['^1.2.0-alpha', '1.2.0-pre'],
      ['^0.0.1-alpha', '0.0.1-beta']
    ].forEach(function(v) {
      var range = v[0];
      var ver = v[1];
      var loose = v[2];
      t.ok(satisfies(ver, range, loose), range + ' satisfied by ' + ver);
    });
    t.end();
  });
  
  test('\nnegative range tests', function(t) {
    // [range, version]
    // version should not be included by range
    [['1.0.0 - 2.0.0', '2.2.3'],
      ['1.2.3+asdf - 2.4.3+asdf', '1.2.3-pre.2'],
      ['1.2.3+asdf - 2.4.3+asdf', '2.4.3-alpha'],
      ['^1.2.3+build', '2.0.0'],
      ['^1.2.3+build', '1.2.0'],
      ['^1.2.3', '1.2.3-pre'],
      ['^1.2', '1.2.0-pre'],
      ['>1.2', '1.3.0-beta'],
      ['<=1.2.3', '1.2.3-beta'],
      ['^1.2.3', '1.2.3-beta'],
      ['=0.7.x', '0.7.0-asdf'],
      ['>=0.7.x', '0.7.0-asdf'],
      ['1', '1.0.0beta', true],
      ['<1', '1.0.0beta', true],
      ['< 1', '1.0.0beta', true],
      ['1.0.0', '1.0.1'],
      ['>=1.0.0', '0.0.0'],
      ['>=1.0.0', '0.0.1'],
      ['>=1.0.0', '0.1.0'],
      ['>1.0.0', '0.0.1'],
      ['>1.0.0', '0.1.0'],
      ['<=2.0.0', '3.0.0'],
      ['<=2.0.0', '2.9999.9999'],
      ['<=2.0.0', '2.2.9'],
      ['<2.0.0', '2.9999.9999'],
      ['<2.0.0', '2.2.9'],
      ['>=0.1.97', 'v0.1.93', true],
      ['>=0.1.97', '0.1.93'],
      ['0.1.20 || 1.2.4', '1.2.3'],
      ['>=0.2.3 || <0.0.1', '0.0.3'],
      ['>=0.2.3 || <0.0.1', '0.2.2'],
      ['2.x.x', '1.1.3'],
      ['2.x.x', '3.1.3'],
      ['1.2.x', '1.3.3'],
      ['1.2.x || 2.x', '3.1.3'],
      ['1.2.x || 2.x', '1.1.3'],
      ['2.*.*', '1.1.3'],
      ['2.*.*', '3.1.3'],
      ['1.2.*', '1.3.3'],
      ['1.2.* || 2.*', '3.1.3'],
      ['1.2.* || 2.*', '1.1.3'],
      ['2', '1.1.2'],
      ['2.3', '2.4.1'],
      ['~2.4', '2.5.0'], // >=2.4.0 <2.5.0
      ['~2.4', '2.3.9'],
      ['~>3.2.1', '3.3.2'], // >=3.2.1 <3.3.0
      ['~>3.2.1', '3.2.0'], // >=3.2.1 <3.3.0
      ['~1', '0.2.3'], // >=1.0.0 <2.0.0
      ['~>1', '2.2.3'],
      ['~1.0', '1.1.0'], // >=1.0.0 <1.1.0
      ['<1', '1.0.0'],
      ['>=1.2', '1.1.1'],
      ['1', '2.0.0beta', true],
      ['~v0.5.4-beta', '0.5.4-alpha'],
      ['=0.7.x', '0.8.2'],
      ['>=0.7.x', '0.6.2'],
      ['<0.7.x', '0.7.2'],
      ['<1.2.3', '1.2.3-beta'],
      ['=1.2.3', '1.2.3-beta'],
      ['>1.2', '1.2.8'],
      ['^1.2.3', '2.0.0-alpha'],
      ['^1.2.3', '1.2.2'],
      ['^1.2', '1.1.9'],
      ['*', 'v1.2.3-foo', true],
      // invalid ranges never satisfied!
      ['blerg', '1.2.3'],
      ['git+https://user:password0123@github.com/foo', '123.0.0', true],
      ['^1.2.3', '2.0.0-pre']
    ].forEach(function(v) {
      var range = v[0];
      var ver = v[1];
      var loose = v[2];
      var found = satisfies(ver, range, loose);
      t.ok(!found, ver + ' not satisfied by ' + range);
    });
    t.end();
  });
  
  test('\nincrement versions test', function(t) {
  //  [version, inc, result, identifier]
  //  inc(version, inc) -> result
    [['1.2.3', 'major', '2.0.0'],
      ['1.2.3', 'minor', '1.3.0'],
      ['1.2.3', 'patch', '1.2.4'],
      ['1.2.3tag', 'major', '2.0.0', true],
      ['1.2.3-tag', 'major', '2.0.0'],
      ['1.2.3', 'fake', null],
      ['1.2.0-0', 'patch', '1.2.0'],
      ['fake', 'major', null],
      ['1.2.3-4', 'major', '2.0.0'],
      ['1.2.3-4', 'minor', '1.3.0'],
      ['1.2.3-4', 'patch', '1.2.3'],
      ['1.2.3-alpha.0.beta', 'major', '2.0.0'],
      ['1.2.3-alpha.0.beta', 'minor', '1.3.0'],
      ['1.2.3-alpha.0.beta', 'patch', '1.2.3'],
      ['1.2.4', 'prerelease', '1.2.5-0'],
      ['1.2.3-0', 'prerelease', '1.2.3-1'],
      ['1.2.3-alpha.0', 'prerelease', '1.2.3-alpha.1'],
      ['1.2.3-alpha.1', 'prerelease', '1.2.3-alpha.2'],
      ['1.2.3-alpha.2', 'prerelease', '1.2.3-alpha.3'],
      ['1.2.3-alpha.0.beta', 'prerelease', '1.2.3-alpha.1.beta'],
      ['1.2.3-alpha.1.beta', 'prerelease', '1.2.3-alpha.2.beta'],
      ['1.2.3-alpha.2.beta', 'prerelease', '1.2.3-alpha.3.beta'],
      ['1.2.3-alpha.10.0.beta', 'prerelease', '1.2.3-alpha.10.1.beta'],
      ['1.2.3-alpha.10.1.beta', 'prerelease', '1.2.3-alpha.10.2.beta'],
      ['1.2.3-alpha.10.2.beta', 'prerelease', '1.2.3-alpha.10.3.beta'],
      ['1.2.3-alpha.10.beta.0', 'prerelease', '1.2.3-alpha.10.beta.1'],
      ['1.2.3-alpha.10.beta.1', 'prerelease', '1.2.3-alpha.10.beta.2'],
      ['1.2.3-alpha.10.beta.2', 'prerelease', '1.2.3-alpha.10.beta.3'],
      ['1.2.3-alpha.9.beta', 'prerelease', '1.2.3-alpha.10.beta'],
      ['1.2.3-alpha.10.beta', 'prerelease', '1.2.3-alpha.11.beta'],
      ['1.2.3-alpha.11.beta', 'prerelease', '1.2.3-alpha.12.beta'],
      ['1.2.0', 'prepatch', '1.2.1-0'],
      ['1.2.0-1', 'prepatch', '1.2.1-0'],
      ['1.2.0', 'preminor', '1.3.0-0'],
      ['1.2.3-1', 'preminor', '1.3.0-0'],
      ['1.2.0', 'premajor', '2.0.0-0'],
      ['1.2.3-1', 'premajor', '2.0.0-0'],
      ['1.2.0-1', 'minor', '1.2.0'],
      ['1.0.0-1', 'major', '1.0.0'],
  
      ['1.2.3', 'major', '2.0.0', false, 'dev'],
      ['1.2.3', 'minor', '1.3.0', false, 'dev'],
      ['1.2.3', 'patch', '1.2.4', false, 'dev'],
      ['1.2.3tag', 'major', '2.0.0', true, 'dev'],
      ['1.2.3-tag', 'major', '2.0.0', false, 'dev'],
      ['1.2.3', 'fake', null, false, 'dev'],
      ['1.2.0-0', 'patch', '1.2.0', false, 'dev'],
      ['fake', 'major', null, false, 'dev'],
      ['1.2.3-4', 'major', '2.0.0', false, 'dev'],
      ['1.2.3-4', 'minor', '1.3.0', false, 'dev'],
      ['1.2.3-4', 'patch', '1.2.3', false, 'dev'],
      ['1.2.3-alpha.0.beta', 'major', '2.0.0', false, 'dev'],
      ['1.2.3-alpha.0.beta', 'minor', '1.3.0', false, 'dev'],
      ['1.2.3-alpha.0.beta', 'patch', '1.2.3', false, 'dev'],
      ['1.2.4', 'prerelease', '1.2.5-dev.0', false, 'dev'],
      ['1.2.3-0', 'prerelease', '1.2.3-dev.0', false, 'dev'],
      ['1.2.3-alpha.0', 'prerelease', '1.2.3-dev.0', false, 'dev'],
      ['1.2.3-alpha.0', 'prerelease', '1.2.3-alpha.1', false, 'alpha'],
      ['1.2.3-alpha.0.beta', 'prerelease', '1.2.3-dev.0', false, 'dev'],
      ['1.2.3-alpha.0.beta', 'prerelease', '1.2.3-alpha.1.beta', false, 'alpha'],
      ['1.2.3-alpha.10.0.beta', 'prerelease', '1.2.3-dev.0', false, 'dev'],
      ['1.2.3-alpha.10.0.beta', 'prerelease', '1.2.3-alpha.10.1.beta', false, 'alpha'],
      ['1.2.3-alpha.10.1.beta', 'prerelease', '1.2.3-alpha.10.2.beta', false, 'alpha'],
      ['1.2.3-alpha.10.2.beta', 'prerelease', '1.2.3-alpha.10.3.beta', false, 'alpha'],
      ['1.2.3-alpha.10.beta.0', 'prerelease', '1.2.3-dev.0', false, 'dev'],
      ['1.2.3-alpha.10.beta.0', 'prerelease', '1.2.3-alpha.10.beta.1', false, 'alpha'],
      ['1.2.3-alpha.10.beta.1', 'prerelease', '1.2.3-alpha.10.beta.2', false, 'alpha'],
      ['1.2.3-alpha.10.beta.2', 'prerelease', '1.2.3-alpha.10.beta.3', false, 'alpha'],
      ['1.2.3-alpha.9.beta', 'prerelease', '1.2.3-dev.0', false, 'dev'],
      ['1.2.3-alpha.9.beta', 'prerelease', '1.2.3-alpha.10.beta', false, 'alpha'],
      ['1.2.3-alpha.10.beta', 'prerelease', '1.2.3-alpha.11.beta', false, 'alpha'],
      ['1.2.3-alpha.11.beta', 'prerelease', '1.2.3-alpha.12.beta', false, 'alpha'],
      ['1.2.0', 'prepatch', '1.2.1-dev.0', false, 'dev'],
      ['1.2.0-1', 'prepatch', '1.2.1-dev.0', false, 'dev'],
      ['1.2.0', 'preminor', '1.3.0-dev.0', false, 'dev'],
      ['1.2.3-1', 'preminor', '1.3.0-dev.0', false, 'dev'],
      ['1.2.0', 'premajor', '2.0.0-dev.0', false, 'dev'],
      ['1.2.3-1', 'premajor', '2.0.0-dev.0', false, 'dev'],
      ['1.2.0-1', 'minor', '1.2.0', false, 'dev'],
      ['1.0.0-1', 'major', '1.0.0', false, 'dev'],
      ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev.0', false, 'dev']
  
    ].forEach(function(v) {
      var pre = v[0];
      var what = v[1];
      var wanted = v[2];
      var loose = v[3];
      var id = v[4];
      var found = inc(pre, what, loose, id);
      var cmd = 'inc(' + pre + ', ' + what + ', ' + id + ')';
      t.equal(found, wanted, cmd + ' === ' + wanted);
  
      var parsed = semver.parse(pre, loose);
      if (wanted) {
        parsed.inc(what, id);
        t.equal(parsed.version, wanted, cmd + ' object version updated');
        t.equal(parsed.raw, wanted, cmd + ' object raw field updated');
      } else if (parsed) {
        t.throws(function () {
          parsed.inc(what, id)
        })
      } else {
        t.equal(parsed, null)
      }
    });
  
    t.end();
  });
  
  test('\ndiff versions test', function(t) {
  //  [version1, version2, result]
  //  diff(version1, version2) -> result
    [['1.2.3', '0.2.3', 'major'],
      ['1.4.5', '0.2.3', 'major'],
      ['1.2.3', '2.0.0-pre', 'premajor'],
      ['1.2.3', '1.3.3', 'minor'],
      ['1.0.1', '1.1.0-pre', 'preminor'],
      ['1.2.3', '1.2.4', 'patch'],
      ['1.2.3', '1.2.4-pre', 'prepatch'],
      ['0.0.1', '0.0.1-pre', 'prerelease'],
      ['0.0.1', '0.0.1-pre-2', 'prerelease'],
      ['1.1.0', '1.1.0-pre', 'prerelease'],
      ['1.1.0-pre-1', '1.1.0-pre-2', 'prerelease'],
      ['1.0.0', '1.0.0', null]
  
    ].forEach(function(v) {
      var version1 = v[0];
      var version2 = v[1];
      var wanted = v[2];
      var found = diff(version1, version2);
      var cmd = 'diff(' + version1 + ', ' + version2 + ')';
      t.equal(found, wanted, cmd + ' === ' + wanted);
    });
  
    t.end();
  });
  
  test('\nvalid range test', function(t) {
    // [range, result]
    // validRange(range) -> result
    // translate ranges into their canonical form
    [['1.0.0 - 2.0.0', '>=1.0.0 <=2.0.0'],
      ['1.0.0', '1.0.0'],
      ['>=*', '*'],
      ['', '*'],
      ['*', '*'],
      ['*', '*'],
      ['>=1.0.0', '>=1.0.0'],
      ['>1.0.0', '>1.0.0'],
      ['<=2.0.0', '<=2.0.0'],
      ['1', '>=1.0.0 <2.0.0'],
      ['<=2.0.0', '<=2.0.0'],
      ['<=2.0.0', '<=2.0.0'],
      ['<2.0.0', '<2.0.0'],
      ['<2.0.0', '<2.0.0'],
      ['>= 1.0.0', '>=1.0.0'],
      ['>=  1.0.0', '>=1.0.0'],
      ['>=   1.0.0', '>=1.0.0'],
      ['> 1.0.0', '>1.0.0'],
      ['>  1.0.0', '>1.0.0'],
      ['<=   2.0.0', '<=2.0.0'],
      ['<= 2.0.0', '<=2.0.0'],
      ['<=  2.0.0', '<=2.0.0'],
      ['<    2.0.0', '<2.0.0'],
      ['<	2.0.0', '<2.0.0'],
      ['>=0.1.97', '>=0.1.97'],
      ['>=0.1.97', '>=0.1.97'],
      ['0.1.20 || 1.2.4', '0.1.20||1.2.4'],
      ['>=0.2.3 || <0.0.1', '>=0.2.3||<0.0.1'],
      ['>=0.2.3 || <0.0.1', '>=0.2.3||<0.0.1'],
      ['>=0.2.3 || <0.0.1', '>=0.2.3||<0.0.1'],
      ['||', '||'],
      ['2.x.x', '>=2.0.0 <3.0.0'],
      ['1.2.x', '>=1.2.0 <1.3.0'],
      ['1.2.x || 2.x', '>=1.2.0 <1.3.0||>=2.0.0 <3.0.0'],
      ['1.2.x || 2.x', '>=1.2.0 <1.3.0||>=2.0.0 <3.0.0'],
      ['x', '*'],
      ['2.*.*', '>=2.0.0 <3.0.0'],
      ['1.2.*', '>=1.2.0 <1.3.0'],
      ['1.2.* || 2.*', '>=1.2.0 <1.3.0||>=2.0.0 <3.0.0'],
      ['*', '*'],
      ['2', '>=2.0.0 <3.0.0'],
      ['2.3', '>=2.3.0 <2.4.0'],
      ['~2.4', '>=2.4.0 <2.5.0'],
      ['~2.4', '>=2.4.0 <2.5.0'],
      ['~>3.2.1', '>=3.2.1 <3.3.0'],
      ['~1', '>=1.0.0 <2.0.0'],
      ['~>1', '>=1.0.0 <2.0.0'],
      ['~> 1', '>=1.0.0 <2.0.0'],
      ['~1.0', '>=1.0.0 <1.1.0'],
      ['~ 1.0', '>=1.0.0 <1.1.0'],
      ['^0', '>=0.0.0 <1.0.0'],
      ['^ 1', '>=1.0.0 <2.0.0'],
      ['^0.1', '>=0.1.0 <0.2.0'],
      ['^1.0', '>=1.0.0 <2.0.0'],
      ['^1.2', '>=1.2.0 <2.0.0'],
      ['^0.0.1', '>=0.0.1 <0.0.2'],
      ['^0.0.1-beta', '>=0.0.1-beta <0.0.2'],
      ['^0.1.2', '>=0.1.2 <0.2.0'],
      ['^1.2.3', '>=1.2.3 <2.0.0'],
      ['^1.2.3-beta.4', '>=1.2.3-beta.4 <2.0.0'],
      ['<1', '<1.0.0'],
      ['< 1', '<1.0.0'],
      ['>=1', '>=1.0.0'],
      ['>= 1', '>=1.0.0'],
      ['<1.2', '<1.2.0'],
      ['< 1.2', '<1.2.0'],
      ['1', '>=1.0.0 <2.0.0'],
      ['>01.02.03', '>1.2.3', true],
      ['>01.02.03', null],
      ['~1.2.3beta', '>=1.2.3-beta <1.3.0', true],
      ['~1.2.3beta', null],
      ['^ 1.2 ^ 1', '>=1.2.0 <2.0.0 >=1.0.0 <2.0.0']
    ].forEach(function(v) {
      var pre = v[0];
      var wanted = v[1];
      var loose = v[2];
      var found = validRange(pre, loose);
  
      t.equal(found, wanted, 'validRange(' + pre + ') === ' + wanted);
    });
  
    t.end();
  });
  
  test('\ncomparators test', function(t) {
    // [range, comparators]
    // turn range into a set of individual comparators
    [['1.0.0 - 2.0.0', [['>=1.0.0', '<=2.0.0']]],
      ['1.0.0', [['1.0.0']]],
      ['>=*', [['']]],
      ['', [['']]],
      ['*', [['']]],
      ['*', [['']]],
      ['>=1.0.0', [['>=1.0.0']]],
      ['>=1.0.0', [['>=1.0.0']]],
      ['>=1.0.0', [['>=1.0.0']]],
      ['>1.0.0', [['>1.0.0']]],
      ['>1.0.0', [['>1.0.0']]],
      ['<=2.0.0', [['<=2.0.0']]],
      ['1', [['>=1.0.0', '<2.0.0']]],
      ['<=2.0.0', [['<=2.0.0']]],
      ['<=2.0.0', [['<=2.0.0']]],
      ['<2.0.0', [['<2.0.0']]],
      ['<2.0.0', [['<2.0.0']]],
      ['>= 1.0.0', [['>=1.0.0']]],
      ['>=  1.0.0', [['>=1.0.0']]],
      ['>=   1.0.0', [['>=1.0.0']]],
      ['> 1.0.0', [['>1.0.0']]],
      ['>  1.0.0', [['>1.0.0']]],
      ['<=   2.0.0', [['<=2.0.0']]],
      ['<= 2.0.0', [['<=2.0.0']]],
      ['<=  2.0.0', [['<=2.0.0']]],
      ['<    2.0.0', [['<2.0.0']]],
      ['<\t2.0.0', [['<2.0.0']]],
      ['>=0.1.97', [['>=0.1.97']]],
      ['>=0.1.97', [['>=0.1.97']]],
      ['0.1.20 || 1.2.4', [['0.1.20'], ['1.2.4']]],
      ['>=0.2.3 || <0.0.1', [['>=0.2.3'], ['<0.0.1']]],
      ['>=0.2.3 || <0.0.1', [['>=0.2.3'], ['<0.0.1']]],
      ['>=0.2.3 || <0.0.1', [['>=0.2.3'], ['<0.0.1']]],
      ['||', [[''], ['']]],
      ['2.x.x', [['>=2.0.0', '<3.0.0']]],
      ['1.2.x', [['>=1.2.0', '<1.3.0']]],
      ['1.2.x || 2.x', [['>=1.2.0', '<1.3.0'], ['>=2.0.0', '<3.0.0']]],
      ['1.2.x || 2.x', [['>=1.2.0', '<1.3.0'], ['>=2.0.0', '<3.0.0']]],
      ['x', [['']]],
      ['2.*.*', [['>=2.0.0', '<3.0.0']]],
      ['1.2.*', [['>=1.2.0', '<1.3.0']]],
      ['1.2.* || 2.*', [['>=1.2.0', '<1.3.0'], ['>=2.0.0', '<3.0.0']]],
      ['1.2.* || 2.*', [['>=1.2.0', '<1.3.0'], ['>=2.0.0', '<3.0.0']]],
      ['*', [['']]],
      ['2', [['>=2.0.0', '<3.0.0']]],
      ['2.3', [['>=2.3.0', '<2.4.0']]],
      ['~2.4', [['>=2.4.0', '<2.5.0']]],
      ['~2.4', [['>=2.4.0', '<2.5.0']]],
      ['~>3.2.1', [['>=3.2.1', '<3.3.0']]],
      ['~1', [['>=1.0.0', '<2.0.0']]],
      ['~>1', [['>=1.0.0', '<2.0.0']]],
      ['~> 1', [['>=1.0.0', '<2.0.0']]],
      ['~1.0', [['>=1.0.0', '<1.1.0']]],
      ['~ 1.0', [['>=1.0.0', '<1.1.0']]],
      ['~ 1.0.3', [['>=1.0.3', '<1.1.0']]],
      ['~> 1.0.3', [['>=1.0.3', '<1.1.0']]],
      ['<1', [['<1.0.0']]],
      ['< 1', [['<1.0.0']]],
      ['>=1', [['>=1.0.0']]],
      ['>= 1', [['>=1.0.0']]],
      ['<1.2', [['<1.2.0']]],
      ['< 1.2', [['<1.2.0']]],
      ['1', [['>=1.0.0', '<2.0.0']]],
      ['1 2', [['>=1.0.0', '<2.0.0', '>=2.0.0', '<3.0.0']]],
      ['1.2 - 3.4.5', [['>=1.2.0', '<=3.4.5']]],
      ['1.2.3 - 3.4', [['>=1.2.3', '<3.5.0']]],
      ['1.2.3 - 3', [['>=1.2.3', '<4.0.0']]],
      ['>*', [['<0.0.0']]],
      ['<*', [['<0.0.0']]]
    ].forEach(function(v) {
      var pre = v[0];
      var wanted = v[1];
      var found = toComparators(v[0]);
      var jw = JSON.stringify(wanted);
      t.equivalent(found, wanted, 'toComparators(' + pre + ') === ' + jw);
    });
  
    t.end();
  });
  
  test('\ninvalid version numbers', function(t) {
    ['1.2.3.4',
     'NOT VALID',
     1.2,
     null,
     'Infinity.NaN.Infinity'
    ].forEach(function(v) {
      t.throws(function() {
        new SemVer(v);
      }, {name:'TypeError', message:'Invalid Version: ' + v});
    });
  
    t.end();
  });
  
  test('\nstrict vs loose version numbers', function(t) {
    [['=1.2.3', '1.2.3'],
      ['01.02.03', '1.2.3'],
      ['1.2.3-beta.01', '1.2.3-beta.1'],
      ['   =1.2.3', '1.2.3'],
      ['1.2.3foo', '1.2.3-foo']
    ].forEach(function(v) {
      var loose = v[0];
      var strict = v[1];
      t.throws(function() {
        new SemVer(loose);
      });
      var lv = new SemVer(loose, true);
      t.equal(lv.version, strict);
      t.ok(eq(loose, strict, true));
      t.throws(function() {
        eq(loose, strict);
      });
      t.throws(function() {
        new SemVer(strict).compare(loose);
      });
    });
    t.end();
  });
  
  test('\nstrict vs loose ranges', function(t) {
    [['>=01.02.03', '>=1.2.3'],
      ['~1.02.03beta', '>=1.2.3-beta <1.3.0']
    ].forEach(function(v) {
      var loose = v[0];
      var comps = v[1];
      t.throws(function() {
        new Range(loose);
      });
      t.equal(new Range(loose, true).range, comps);
    });
    t.end();
  });
  
  test('\nmax satisfying', function(t) {
    [[['1.2.3', '1.2.4'], '1.2', '1.2.4'],
      [['1.2.4', '1.2.3'], '1.2', '1.2.4'],
      [['1.2.3', '1.2.4', '1.2.5', '1.2.6'], '~1.2.3', '1.2.6'],
      [['1.1.0', '1.2.0', '1.2.1', '1.3.0', '2.0.0b1', '2.0.0b2', '2.0.0b3', '2.0.0', '2.1.0'], '~2.0.0', '2.0.0', true]
    ].forEach(function(v) {
      var versions = v[0];
      var range = v[1];
      var expect = v[2];
      var loose = v[3];
      var actual = semver.maxSatisfying(versions, range, loose);
      t.equal(actual, expect);
    });
    t.end();
  });
  