diff --git a/.github/workflows/test-windows.yml b/.github/workflows/test-windows.yml
index e089344..148e5da 100644
--- a/.github/workflows/test-windows.yml
+++ b/.github/workflows/test-windows.yml
@@ -12,5 +12,10 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: '12'
+      - run: choco install exiftool graphicsmagick
+      # GraphicsMagick must be manually added to the path 
+      - run: |
+          $installPath = Get-ChildItem 'C:\Program Files\GraphicsMagick*' | Select-Object -First 1 | % { $_.FullName }
+          echo "$installPath" | Out-file -Append -FilePath $env:GITHUB_PATH -Encoding utf8
       - run: npm install
       - run: npm test
diff --git a/.mocharc.yml b/.mocharc.yml
index 92d25dc..dce6506 100644
--- a/.mocharc.yml
+++ b/.mocharc.yml
@@ -1,5 +1,5 @@
 recursive: true
-require:
+file:
   - test/helpers.js
   - test/log.js
 reporter: list
diff --git a/package.json b/package.json
index fa5016a..c5182f1 100644
--- a/package.json
+++ b/package.json
@@ -91,7 +91,9 @@
       "describe",
       "xdescribe",
       "it",
-      "xit"
+      "xit",
+      "itLinux",
+      "itWindows"
     ]
   }
 }
diff --git a/src/website/theme-base/helpers/relative.js b/src/website/theme-base/helpers/relative.js
index 4c07ba8..c845cf4 100644
--- a/src/website/theme-base/helpers/relative.js
+++ b/src/website/theme-base/helpers/relative.js
@@ -3,6 +3,7 @@ const path = require('path')
 module.exports = (target, options) => {
   const albumPath = options.data.root.album.path
   const relative = path.relative(path.dirname(albumPath), target)
+  const url = relative.replace(/\\/g, '/')
   // Escape single/double quotes
-  return relative.replace(/'/g, '%27').replace(/"/g, '%22')
+  return url.replace(/'/g, '%27').replace(/"/g, '%22')
 }
diff --git a/test/cli/options.spec.js b/test/cli/options.spec.js
index 6fec119..df11c3b 100644
--- a/test/cli/options.spec.js
+++ b/test/cli/options.spec.js
@@ -3,8 +3,10 @@ const process = require('process')
 const should = require('should/as-function')
 const sinon = require('sinon')
 const options = require('../../src/cli/options.js')
+const fixtures = require('../fixtures.js')
 
 const BASE_ARGS = ['--input', 'photos', '--output', 'website']
+const ospath = fixtures.ospath
 
 describe('options', function () {
   before(() => {
@@ -112,11 +114,16 @@ describe('options', function () {
         const opts = options.get(args)
         should(opts.databaseFile).eql(path.join(process.cwd(), 'album.db'))
       })
-      it('can be overridden with an absolute url', () => {
+      itLinux('can be overridden with an absolute url (Linux)', () => {
         const args = BASE_ARGS.concat(['--database-file', '/media/album.db'])
         const opts = options.get(args)
         should(opts.databaseFile).eql('/media/album.db')
       })
+      itWindows('can be overridden with an absolute url (Windows)', () => {
+        const args = BASE_ARGS.concat(['--database-file', 'C:\\media\\album.db'])
+        const opts = options.get(args)
+        should(opts.databaseFile).eql('C:\\media\\album.db')
+      })
     })
     describe('log file path', () => {
       it('defaults to the output folder', () => {
@@ -207,7 +214,7 @@ describe('options', function () {
         '--css', 'path/to/custom.css'
       ])
       const opts = options.get(args)
-      should(opts.themeStyle).eql('path/to/custom.css')
+      should(opts.themeStyle).eql(ospath('path/to/custom.css'))
     })
   })
 })
diff --git a/test/components/exiftool/integration.spec.js b/test/components/exiftool/integration.spec.js
index e414ce2..6903225 100644
--- a/test/components/exiftool/integration.spec.js
+++ b/test/components/exiftool/integration.spec.js
@@ -4,8 +4,8 @@ const fixtures = require('../../fixtures')
 const exiftool = require('../../../src/components/exiftool/parallel')
 
 describe('exiftool', function () {
-  this.slow(1000)
-  this.timeout(1000)
+  this.slow(10000)
+  this.timeout(10000)
 
   it('processes all files', (done) => {
     // generate some photos in a temp folder
diff --git a/test/components/index/glob.spec.js b/test/components/index/glob.spec.js
index ef44964..24ca7f3 100644
--- a/test/components/index/glob.spec.js
+++ b/test/components/index/glob.spec.js
@@ -189,9 +189,10 @@ describe('Index: glob', function () {
     ], done)
   })
 
-  it('ignores invalid file names', function (done) {
-    if (os.platform() === 'darwin') {
+  it('ignores invalid file names on Linux', function (done) {
+    if (os.platform() !== 'linux') {
       // the invalid filename generates a system error on macOS
+      // and is actually valid on Windows
       return this.skip()
     }
     const tmpdir = tmp.dirSync({ unsafeCleanup: true })
diff --git a/test/fixtures.js b/test/fixtures.js
index bf79f43..0c8c783 100644
--- a/test/fixtures.js
+++ b/test/fixtures.js
@@ -71,3 +71,8 @@ exports.createTempStructure = function (files) {
   })
   return tmpdir
 }
+
+// convert to OS-dependent style paths for testing
+exports.ospath = function (filepath) {
+  return filepath.replace(RegExp('/', 'g'), path.sep)
+}
diff --git a/test/helpers.js b/test/helpers.js
index 625c24e..0efa8c9 100644
--- a/test/helpers.js
+++ b/test/helpers.js
@@ -9,3 +9,11 @@ process.on('unhandledRejection', err => {
 // Automatically delete temporary files/folders
 // Created during the tests
 tmp.setGracefulCleanup()
+
+// Helpers for Linux and Windows-only tests
+function test (title, fn) {
+  it(title, fn)
+}
+
+global.itLinux = (process.platform !== 'win32') ? test : () => {}
+global.itWindows = (process.platform === 'win32') ? test : () => {}
diff --git a/test/model/album-previews.spec.js b/test/model/album-previews.spec.js
index 8683a65..bd0175d 100644
--- a/test/model/album-previews.spec.js
+++ b/test/model/album-previews.spec.js
@@ -1,5 +1,4 @@
 const _ = require('lodash')
-const path = require('path')
 const should = require('should/as-function')
 const Album = require('../../src/model/album')
 const fixtures = require('../fixtures')
@@ -9,9 +8,9 @@ function arrayOfFiles (count) {
   return Array.from(base, (_, index) => fixtures.photo(`${index}`))
 }
 
-function outputName (output) {
-  const ext = path.extname(output.urls.thumbnail)
-  return path.basename(output.urls.thumbnail, ext)
+function outputName (file) {
+  const thumb = file.urls.thumbnail
+  return thumb.substring(thumb.lastIndexOf('/') + 1, thumb.lastIndexOf('.'))
 }
 
 describe('Album', function () {
diff --git a/test/model/output.spec.js b/test/model/output.spec.js
index 70694c6..00f1311 100644
--- a/test/model/output.spec.js
+++ b/test/model/output.spec.js
@@ -1,12 +1,15 @@
 const should = require('should/as-function')
 const output = require('../../src/model/output')
+const fixtures = require('../fixtures.js')
+
+const ospath = fixtures.ospath
 
 describe('Output paths', function () {
   describe('Images', function () {
     it('generates a thumbnail', function () {
       const o = output.paths('holidays/beach.jpg', 'image', {})
       should(o.thumbnail).eql({
-        path: 'media/thumbs/holidays/beach.jpg',
+        path: ospath('media/thumbs/holidays/beach.jpg'),
         rel: 'photo:thumbnail'
       })
     })
@@ -14,7 +17,7 @@ describe('Output paths', function () {
     it('generates a large "web" version', function () {
       const o = output.paths('holidays/beach.jpg', 'image', {})
       should(o.large).eql({
-        path: 'media/large/holidays/beach.jpg',
+        path: ospath('media/large/holidays/beach.jpg'),
         rel: 'photo:large'
       })
     })
@@ -24,7 +27,7 @@ describe('Output paths', function () {
         photoDownload: 'resize'
       })
       should(o.download).eql({
-        path: 'media/large/holidays/beach.jpg',
+        path: ospath('media/large/holidays/beach.jpg'),
         rel: 'photo:large'
       })
     })
@@ -34,7 +37,7 @@ describe('Output paths', function () {
         photoPreview: 'copy'
       })
       should(o.large).eql({
-        path: 'media/original/holidays/beach.jpg',
+        path: ospath('media/original/holidays/beach.jpg'),
         rel: 'fs:copy'
       })
     })
@@ -44,7 +47,7 @@ describe('Output paths', function () {
         photoDownload: 'copy'
       })
       should(o.download).eql({
-        path: 'media/original/holidays/beach.jpg',
+        path: ospath('media/original/holidays/beach.jpg'),
         rel: 'fs:copy'
       })
     })
@@ -54,7 +57,7 @@ describe('Output paths', function () {
         photoDownload: 'symlink'
       })
       should(o.download).eql({
-        path: 'media/original/holidays/beach.jpg',
+        path: ospath('media/original/holidays/beach.jpg'),
         rel: 'fs:symlink'
       })
     })
@@ -65,7 +68,7 @@ describe('Output paths', function () {
         linkPrefix: '../myphotos'
       })
       should(o.download).eql({
-        path: '../myphotos/holidays/beach.jpg',
+        path: ospath('../myphotos/holidays/beach.jpg'),
         rel: 'fs:link'
       })
     })
@@ -73,7 +76,7 @@ describe('Output paths', function () {
     it('keeps the original image format if the browser supports it', function () {
       ['jpg', 'JPG', 'jpeg', 'JPEG', 'png', 'PNG', 'gif', 'GIF'].forEach(ext => {
         const o = output.paths(`holidays/beach.${ext}`, 'image', {})
-        should(o.thumbnail.path).eql(`media/thumbs/holidays/beach.${ext}`)
+        should(o.thumbnail.path).eql(ospath(`media/thumbs/holidays/beach.${ext}`))
       })
     })
 
@@ -81,7 +84,7 @@ describe('Output paths', function () {
       // some of these formats are supported on certain browser, but we aim for maximum compatibility
       ['bmp', 'tiff', 'webp'].forEach(ext => {
         const o = output.paths(`holidays/beach.${ext}`, 'image', {})
-        should(o.thumbnail.path).eql(`media/thumbs/holidays/beach.jpg`)
+        should(o.thumbnail.path).eql(ospath(`media/thumbs/holidays/beach.jpg`))
       })
     })
   })
@@ -90,7 +93,7 @@ describe('Output paths', function () {
     it('generates a thumbnail', function () {
       const o = output.paths('holidays/seagull.mp4', 'video', {})
       should(o.thumbnail).eql({
-        path: 'media/thumbs/holidays/seagull.jpg',
+        path: ospath('media/thumbs/holidays/seagull.jpg'),
         rel: 'video:thumbnail'
       })
     })
@@ -98,7 +101,7 @@ describe('Output paths', function () {
     it('generates a poster image', function () {
       const o = output.paths('holidays/seagull.mp4', 'video', {})
       should(o.large).eql({
-        path: 'media/large/holidays/seagull.jpg',
+        path: ospath('media/large/holidays/seagull.jpg'),
         rel: 'video:poster'
       })
     })
@@ -106,7 +109,7 @@ describe('Output paths', function () {
     it('generates a resized "web" video', function () {
       const o = output.paths('holidays/seagull.mp4', 'video', { videoFormat: 'mp4' })
       should(o.video).eql({
-        path: 'media/large/holidays/seagull.mp4',
+        path: ospath('media/large/holidays/seagull.mp4'),
         rel: 'video:resized'
       })
     })
@@ -117,7 +120,7 @@ describe('Output paths', function () {
         videoFormat: 'mp4'
       })
       should(o.download).eql({
-        path: 'media/large/holidays/seagull.mp4',
+        path: ospath('media/large/holidays/seagull.mp4'),
         rel: 'video:resized'
       })
     })
@@ -127,7 +130,7 @@ describe('Output paths', function () {
         videoDownload: 'copy'
       })
       should(o.download).eql({
-        path: 'media/original/holidays/seagull.mp4',
+        path: ospath('media/original/holidays/seagull.mp4'),
         rel: 'fs:copy'
       })
     })
@@ -137,7 +140,7 @@ describe('Output paths', function () {
         videoPreview: 'copy'
       })
       should(o.video).eql({
-        path: 'media/original/holidays/seagull.mp4',
+        path: ospath('media/original/holidays/seagull.mp4'),
         rel: 'fs:copy'
       })
     })
@@ -147,7 +150,7 @@ describe('Output paths', function () {
         videoDownload: 'symlink'
       })
       should(o.download).eql({
-        path: 'media/original/holidays/seagull.mp4',
+        path: ospath('media/original/holidays/seagull.mp4'),
         rel: 'fs:symlink'
       })
     })
@@ -158,7 +161,7 @@ describe('Output paths', function () {
         linkPrefix: '../myphotos'
       })
       should(o.download).eql({
-        path: '../myphotos/holidays/seagull.mp4',
+        path: ospath('../myphotos/holidays/seagull.mp4'),
         rel: 'fs:link'
       })
     })
@@ -171,7 +174,7 @@ describe('Output paths', function () {
         linkPrefix: '../myphotos'
       })
       should(o.download).eql({
-        path: '../myphotos/holidays/beach.jpg',
+        path: ospath('../myphotos/holidays/beach.jpg'),
         rel: 'fs:link'
       })
     })
@@ -182,12 +185,12 @@ describe('Output paths', function () {
         linkPrefix: '../myphotos/'
       })
       should(o.download).eql({
-        path: '../myphotos/holidays/beach.jpg',
+        path: ospath('../myphotos/holidays/beach.jpg'),
         rel: 'fs:link'
       })
     })
 
-    it('can use an absolute link prefix', function () {
+    itLinux('can use an absolute link prefix on Linux', function () {
       const o = output.paths('holidays/beach.jpg', 'image', {
         photoDownload: 'link',
         linkPrefix: '/Photos'
@@ -198,7 +201,7 @@ describe('Output paths', function () {
       })
     })
 
-    it('can use an absolute link prefix ending with a slash', function () {
+    itLinux('can use an absolute link prefix on Linux ending with a slash', function () {
       const o = output.paths('holidays/beach.jpg', 'image', {
         photoDownload: 'link',
         linkPrefix: '/Photos/'
@@ -209,6 +212,17 @@ describe('Output paths', function () {
       })
     })
 
+    itWindows('can use an absolute link prefix on Windows', function () {
+      const o = output.paths('holidays/beach.jpg', 'image', {
+        photoDownload: 'link',
+        linkPrefix: 'C:\\Photos'
+      })
+      should(o.download).eql({
+        path: ospath('C:\\Photos\\holidays\\beach.jpg'),
+        rel: 'fs:link'
+      })
+    })
+
     it('can use a URL prefix', function () {
       const o = output.paths('holidays/beach.jpg', 'image', {
         photoDownload: 'link',
@@ -236,7 +250,7 @@ describe('Output paths', function () {
     it('defaults to the <folders> structure', function () {
       const o = output.paths('holidays/beach.jpg', 'image', {})
       should(o.download).eql({
-        path: 'media/large/holidays/beach.jpg',
+        path: ospath('media/large/holidays/beach.jpg'),
         rel: 'photo:large'
       })
     })
@@ -246,7 +260,7 @@ describe('Output paths', function () {
         outputStructure: 'folders'
       })
       should(o.download).eql({
-        path: 'media/large/holidays/beach.jpg',
+        path: ospath('media/large/holidays/beach.jpg'),
         rel: 'photo:large'
       })
     })
@@ -256,7 +270,7 @@ describe('Output paths', function () {
         outputStructure: 'suffix'
       })
       should(o.download).eql({
-        path: 'media/holidays/beach_jpg_large.jpg',
+        path: ospath('media/holidays/beach_jpg_large.jpg'),
         rel: 'photo:large'
       })
     })
diff --git a/test/model/structure.spec.js b/test/model/structure.spec.js
index ad0be25..d587f73 100644
--- a/test/model/structure.spec.js
+++ b/test/model/structure.spec.js
@@ -1,77 +1,79 @@
 const _ = require('lodash')
 const should = require('should/as-function')
 const structure = require('../../src/model/structure')
+const fixtures = require('../fixtures.js')
 
 const folders = structure.folders
 const suffix = structure.suffix
+const ospath = fixtures.ospath
 
 describe('Structure', () => {
   describe('folders', () => {
     it('starts with <media>', () => {
-      should(folders('holidays/IMG_0001.jpg', 'photo:thumbnail')).startWith('media/')
-      should(folders('holidays/IMG_0001.jpg', 'photo:large')).startWith('media/')
-      should(folders('holidays/IMG_0001.mp4', 'video:thumbnail')).startWith('media/')
-      should(folders('holidays/IMG_0001.mp4', 'video:poster')).startWith('media/')
-      should(folders('holidays/IMG_0001.mp4', 'video:resized')).startWith('media/')
-      should(folders('holidays/IMG_0001.jpg', 'fs:copy')).startWith('media/')
-      should(folders('holidays/IMG_0001.jpg', 'fs:symlink')).startWith('media/')
+      should(folders('holidays/IMG_0001.jpg', 'photo:thumbnail')).startWith(ospath('media/'))
+      should(folders('holidays/IMG_0001.jpg', 'photo:large')).startWith(ospath('media/'))
+      should(folders('holidays/IMG_0001.mp4', 'video:thumbnail')).startWith(ospath('media/'))
+      should(folders('holidays/IMG_0001.mp4', 'video:poster')).startWith(ospath('media/'))
+      should(folders('holidays/IMG_0001.mp4', 'video:resized')).startWith(ospath('media/'))
+      should(folders('holidays/IMG_0001.jpg', 'fs:copy')).startWith(ospath('media/'))
+      should(folders('holidays/IMG_0001.jpg', 'fs:symlink')).startWith(ospath('media/'))
     })
 
     it('can be at the root', () => {
-      should(folders('IMG_0001.jpg', 'photo:thumbnail')).eql('media/thumbs/IMG_0001.jpg')
+      should(folders('IMG_0001.jpg', 'photo:thumbnail')).eql(ospath('media/thumbs/IMG_0001.jpg'))
     })
 
     it('adds thumbnails to a <thumbs> folder', () => {
-      should(folders('holidays/IMG_0001.jpg', 'photo:thumbnail')).startWith('media/thumbs/holidays/')
-      should(folders('holidays/IMG_0001.mp4', 'video:thumbnail')).startWith('media/thumbs/holidays/')
+      should(folders('holidays/IMG_0001.jpg', 'photo:thumbnail')).startWith(ospath('media/thumbs/holidays/'))
+      should(folders('holidays/IMG_0001.mp4', 'video:thumbnail')).startWith(ospath('media/thumbs/holidays/'))
     })
 
     it('adds large versions to a <large> folder', () => {
-      should(folders('holidays/IMG_0001.jpg', 'photo:large')).startWith('media/large/holidays/')
-      should(folders('holidays/IMG_0001.mp4', 'video:poster')).startWith('media/large/holidays/')
-      should(folders('holidays/IMG_0001.mp4', 'video:resized')).startWith('media/large/holidays/')
+      should(folders('holidays/IMG_0001.jpg', 'photo:large')).startWith(ospath('media/large/holidays/'))
+      should(folders('holidays/IMG_0001.mp4', 'video:poster')).startWith(ospath('media/large/holidays/'))
+      should(folders('holidays/IMG_0001.mp4', 'video:resized')).startWith(ospath('media/large/holidays/'))
     })
 
     it('adds copies and links to an <original> folder', () => {
-      should(folders('holidays/IMG_0001.jpg', 'fs:copy')).startWith('media/original/holidays/')
-      should(folders('holidays/IMG_0001.jpg', 'fs:symlink')).startWith('media/original/holidays/')
+      should(folders('holidays/IMG_0001.jpg', 'fs:copy')).startWith(ospath('media/original/holidays/'))
+      should(folders('holidays/IMG_0001.jpg', 'fs:symlink')).startWith(ospath('media/original/holidays/'))
     })
 
     it('keeps the full original name for copies and links', () => {
-      should(folders('holidays/IMG_0001.jpg', 'fs:copy')).endWith('IMG_0001.jpg')
-      should(folders('holidays/IMG_0001.jpg', 'fs:symlink')).endWith('IMG_0001.jpg')
+      should(folders('holidays/IMG_0001.jpg', 'fs:copy')).endWith(ospath('IMG_0001.jpg'))
+      should(folders('holidays/IMG_0001.jpg', 'fs:symlink')).endWith(ospath('IMG_0001.jpg'))
     })
 
     it('preserves the photo thumbnail extension if supported', () => {
       // lower case
-      should(folders('holidays/IMG_0001.jpg', 'photo:thumbnail')).endWith('IMG_0001.jpg')
-      should(folders('holidays/IMG_0001.jpeg', 'photo:thumbnail')).endWith('IMG_0001.jpeg')
-      should(folders('holidays/IMG_0001.png', 'photo:thumbnail')).endWith('IMG_0001.png')
-      should(folders('holidays/IMG_0001.gif', 'photo:thumbnail')).endWith('IMG_0001.gif')
+      should(folders('holidays/IMG_0001.jpg', 'photo:thumbnail')).endWith(ospath('IMG_0001.jpg'))
+      should(folders('holidays/IMG_0001.jpeg', 'photo:thumbnail')).endWith(ospath('IMG_0001.jpeg'))
+      should(folders('holidays/IMG_0001.png', 'photo:thumbnail')).endWith(ospath('IMG_0001.png'))
+      should(folders('holidays/IMG_0001.gif', 'photo:thumbnail')).endWith(ospath('IMG_0001.gif'))
       // upper case
-      should(folders('holidays/IMG_0001.JPG', 'photo:thumbnail')).endWith('IMG_0001.JPG')
-      should(folders('holidays/IMG_0001.JPEG', 'photo:thumbnail')).endWith('IMG_0001.JPEG')
-      should(folders('holidays/IMG_0001.PNG', 'photo:thumbnail')).endWith('IMG_0001.PNG')
-      should(folders('holidays/IMG_0001.GIF', 'photo:thumbnail')).endWith('IMG_0001.GIF')
+      should(folders('holidays/IMG_0001.JPG', 'photo:thumbnail')).endWith(ospath(ospath('IMG_0001.JPG')))
+      should(folders('holidays/IMG_0001.JPEG', 'photo:thumbnail')).endWith(ospath(ospath('IMG_0001.JPEG')))
+      should(folders('holidays/IMG_0001.PNG', 'photo:thumbnail')).endWith(ospath(ospath('IMG_0001.PNG')))
+      should(folders('holidays/IMG_0001.GIF', 'photo:thumbnail')).endWith(ospath(ospath('IMG_0001.GIF')))
     })
 
     it('changes the photo thumbnail extension to jpg if not supported', () => {
-      should(folders('holidays/IMG_0001.tiff', 'photo:thumbnail')).endWith('IMG_0001.jpg')
+      should(folders('holidays/IMG_0001.tiff', 'photo:thumbnail')).endWith(ospath(ospath('IMG_0001.jpg')))
     })
 
     it('supports two different resized video extensions', () => {
-      should(folders('holidays/IMG_0001.mov', 'video:resized', { videoFormat: 'mp4' })).endWith('IMG_0001.mp4')
-      should(folders('holidays/IMG_0001.mov', 'video:resized', { videoFormat: 'webm' })).endWith('IMG_0001.webm')
+      should(folders('holidays/IMG_0001.mov', 'video:resized', { videoFormat: 'mp4' })).endWith(ospath('IMG_0001.mp4'))
+      should(folders('holidays/IMG_0001.mov', 'video:resized', { videoFormat: 'webm' })).endWith(ospath('IMG_0001.webm'))
     })
 
     it('always uses jpg for video thumbnails and posters', () => {
-      should(folders('holidays/IMG_0001.mp4', 'video:thumbnail')).endWith('IMG_0001.jpg')
-      should(folders('holidays/IMG_0001.mp4', 'video:poster')).endWith('IMG_0001.jpg')
+      should(folders('holidays/IMG_0001.mp4', 'video:thumbnail')).endWith(ospath('IMG_0001.jpg'))
+      should(folders('holidays/IMG_0001.mp4', 'video:poster')).endWith(ospath('IMG_0001.jpg'))
     })
 
     it('can use a file system link', () => {
       const res = folders('holidays/IMG_0001.jpg', 'fs:link', { linkPrefix: '../..' })
-      should(res).eql('../../holidays/IMG_0001.jpg')
+      should(res).eql(ospath('../../holidays/IMG_0001.jpg'))
     })
 
     it('can use a remote HTTP link', () => {
@@ -82,36 +84,36 @@ describe('Structure', () => {
 
   describe('suffix', () => {
     it('starts with <media>', () => {
-      should(suffix('holidays/IMG_0001.jpg', 'photo:thumbnail')).startWith('media/')
-      should(suffix('holidays/IMG_0001.jpg', 'photo:large')).startWith('media/')
-      should(suffix('holidays/IMG_0001.mp4', 'video:thumbnail')).startWith('media/')
-      should(suffix('holidays/IMG_0001.mp4', 'video:poster')).startWith('media/')
-      should(suffix('holidays/IMG_0001.mp4', 'video:resized')).startWith('media/')
-      should(suffix('holidays/IMG_0001.jpg', 'fs:copy')).startWith('media/')
-      should(suffix('holidays/IMG_0001.jpg', 'fs:symlink')).startWith('media/')
+      should(suffix('holidays/IMG_0001.jpg', 'photo:thumbnail')).startWith(ospath('media/'))
+      should(suffix('holidays/IMG_0001.jpg', 'photo:large')).startWith(ospath('media/'))
+      should(suffix('holidays/IMG_0001.mp4', 'video:thumbnail')).startWith(ospath('media/'))
+      should(suffix('holidays/IMG_0001.mp4', 'video:poster')).startWith(ospath('media/'))
+      should(suffix('holidays/IMG_0001.mp4', 'video:resized')).startWith(ospath('media/'))
+      should(suffix('holidays/IMG_0001.jpg', 'fs:copy')).startWith(ospath('media/'))
+      should(suffix('holidays/IMG_0001.jpg', 'fs:symlink')).startWith(ospath('media/'))
     })
 
     it('can be at the root', () => {
-      should(suffix('IMG_0001.jpg', 'photo:thumbnail')).eql('media/IMG_0001_jpg_thumb.jpg')
+      should(suffix('IMG_0001.jpg', 'photo:thumbnail')).eql(ospath('media/IMG_0001_jpg_thumb.jpg'))
     })
 
     it('uses an _thumb suffix to denote thumbnails', () => {
-      should(suffix('holidays/IMG_0001.jpg', 'photo:thumbnail')).endWith('holidays/IMG_0001_jpg_thumb.jpg')
-      should(suffix('holidays/IMG_0001.mp4', 'video:thumbnail')).endWith('holidays/IMG_0001_mp4_thumb.jpg')
+      should(suffix('holidays/IMG_0001.jpg', 'photo:thumbnail')).endWith(ospath('holidays/IMG_0001_jpg_thumb.jpg'))
+      should(suffix('holidays/IMG_0001.mp4', 'video:thumbnail')).endWith(ospath('holidays/IMG_0001_mp4_thumb.jpg'))
     })
 
     it('uses a _large suffix to resized versions', () => {
-      should(suffix('holidays/IMG_0001.jpg', 'photo:large')).endWith('holidays/IMG_0001_jpg_large.jpg')
-      should(suffix('holidays/IMG_0001.mp4', 'video:resized')).endWith('holidays/IMG_0001_mp4_large.mp4')
+      should(suffix('holidays/IMG_0001.jpg', 'photo:large')).endWith(ospath('holidays/IMG_0001_jpg_large.jpg'))
+      should(suffix('holidays/IMG_0001.mp4', 'video:resized')).endWith(ospath('holidays/IMG_0001_mp4_large.mp4'))
     })
 
     it('uses a _poster suffix for the video poster', () => {
-      should(suffix('holidays/IMG_0001.jpg', 'video:poster')).endWith('holidays/IMG_0001_jpg_poster.jpg')
+      should(suffix('holidays/IMG_0001.jpg', 'video:poster')).endWith(ospath('holidays/IMG_0001_jpg_poster.jpg'))
     })
 
     it('uses the original filenames for copies and symlinks', () => {
-      should(suffix('holidays/IMG_0001.jpg', 'fs:copy')).endWith('holidays/IMG_0001.jpg')
-      should(suffix('holidays/IMG_0001.jpg', 'fs:symlink')).endWith('holidays/IMG_0001.jpg')
+      should(suffix('holidays/IMG_0001.jpg', 'fs:copy')).endWith(ospath('holidays/IMG_0001.jpg'))
+      should(suffix('holidays/IMG_0001.jpg', 'fs:symlink')).endWith(ospath('holidays/IMG_0001.jpg'))
     })
 
     it('does not have conflicts between generated photo and video files', () => {
@@ -128,7 +130,7 @@ describe('Structure', () => {
 
     it('can use a file system link', () => {
       const res = suffix('holidays/IMG_0001.jpg', 'fs:link', { linkPrefix: '../..' })
-      should(res).eql('../../holidays/IMG_0001.jpg')
+      should(res).eql(ospath('../../holidays/IMG_0001.jpg'))
     })
 
     it('can use a remote HTTP link', () => {
diff --git a/test/model/url.spec.js b/test/model/url.spec.js
index 07cb728..f62733a 100644
--- a/test/model/url.spec.js
+++ b/test/model/url.spec.js
@@ -1,10 +1,7 @@
 const _ = require('lodash')
-const process = require('process')
 const should = require('should/as-function')
 const url = require('../../src/model/url')
 
-const realPlatform = process.platform
-
 describe('URLs', () => {
   it('escapes non-URL-friendly characters', () => {
     const chars = {
@@ -18,41 +15,23 @@ describe('URLs', () => {
     })
   })
 
-  describe('Linux', () => {
-    before(() => {
-      Object.defineProperty(process, 'platform', { value: 'linux' })
-    })
-    after(() => {
-      Object.defineProperty(process, 'platform', { value: realPlatform })
-    })
-
-    it('converts standard Linux paths', function () {
-      const res = url.fromPath('photos/holidays/IMG_001.jpg')
-      should(res).eql('photos/holidays/IMG_001.jpg')
-    })
-
-    it('encodes backslash in Linux paths', function () {
-      const res = url.fromPath('photos/my\\holidays.jpg')
-      should(res).eql('photos/my%5Cholidays.jpg')
-    })
+  itLinux('converts standard Linux paths', function () {
+    const res = url.fromPath('photos/holidays/IMG_001.jpg')
+    should(res).eql('photos/holidays/IMG_001.jpg')
   })
 
-  describe('Windows', () => {
-    before(() => {
-      Object.defineProperty(process, 'platform', { value: 'win32' })
-    })
-    after(() => {
-      Object.defineProperty(process, 'platform', { value: realPlatform })
-    })
+  itLinux('encodes backslash in Linux paths', function () {
+    const res = url.fromPath('photos/my\\holidays.jpg')
+    should(res).eql('photos/my%5Cholidays.jpg')
+  })
 
-    it('converts standard Windows paths', function () {
-      const res = url.fromPath('photos\\holidays\\IMG_001.jpg')
-      should(res).eql('photos/holidays/IMG_001.jpg')
-    })
+  itWindows('converts standard Windows paths', function () {
+    const res = url.fromPath('photos\\holidays\\IMG_001.jpg')
+    should(res).eql('photos/holidays/IMG_001.jpg')
+  })
 
-    it('slashes are also valid path separators on Windows', function () {
-      const res = url.fromPath('photos/holidays/IMG_001.jpg')
-      should(res).eql('photos/holidays/IMG_001.jpg')
-    })
+  itWindows('slashes are also valid path separators on Windows', function () {
+    const res = url.fromPath('photos/holidays/IMG_001.jpg')
+    should(res).eql('photos/holidays/IMG_001.jpg')
   })
 })
diff --git a/test/steps/step-cleanup.spec.js b/test/steps/step-cleanup.spec.js
index 86b371b..1dcca00 100644
--- a/test/steps/step-cleanup.spec.js
+++ b/test/steps/step-cleanup.spec.js
@@ -4,6 +4,8 @@ const should = require('should/as-function')
 const cleanup = require('../../src/steps/step-cleanup')
 const fixtures = require('../fixtures')
 
+const ospath = fixtures.ospath
+
 describe('Steps: cleanup', () => {
   // we require "mock-fs" inside the tests, otherwise it also affects other tests
   var mock = null
@@ -50,9 +52,10 @@ describe('Steps: cleanup', () => {
       'output/media/large/newyork/IMG_0003.jpg': ''
     })
     const obs = cleanup.run(input, 'output')
+    const extraFile = 'media/large/newyork/IMG_0003.jpg'
     obs.reduce(toArray, []).subscribe(deletedFiles => {
-      should(deletedFiles).deepEqual(['media/large/newyork/IMG_0003.jpg'])
-      should(fs.unlinkSync.args).deepEqual([['output/media/large/newyork/IMG_0003.jpg']])
+      should(deletedFiles).deepEqual([ospath(extraFile)])
+      should(fs.unlinkSync.args).deepEqual([[ospath(`output/${extraFile}`)]])
       testEnd()
     })
   })
diff --git a/test/themes/helpers/relative.spec.js b/test/themes/helpers/relative.spec.js
index 57e4f90..7e1d0fd 100644
--- a/test/themes/helpers/relative.spec.js
+++ b/test/themes/helpers/relative.spec.js
@@ -25,6 +25,7 @@ describe('Handlebars helpers: relative', () => {
     should(res).eql('<link rel="stylesheet" href="../public/theme.css" />')
   })
 
+  // TODO: this should not be needed anymore because all URLs are already escaped
   it('escapes single quotes so they can be used in CSS background-image', () => {
     const template = handlebars.compile(`background-image('{{relative url}}')`)
     const res = template({
@@ -36,6 +37,7 @@ describe('Handlebars helpers: relative', () => {
     should(res).eql("background-image('l%27histoire.jpg')")
   })
 
+  // TODO: this should not be needed anymore because all URLs are already escaped
   it('escapes double quotes so they can be used in <img> tags', () => {
     const template = handlebars.compile(`<img src="{{relative url}}" />`)
     const res = template({