diff --git a/index.js b/index.js
index 0b7a39d..50a666e 100644
--- a/index.js
+++ b/index.js
@@ -84,6 +84,10 @@ function send (req, path, options) {
   return new SendStream(req, path, options)
 }
 
+var errors = {}
+errors.INVALID_OPTION_FS_STAT = new TypeError('Invalid option: Incompatible file system interface: fs.stat() method is expected')
+errors.INVALID_OPTION_FS_CRTSTRM = new TypeError('Invalid option: Incompatible file system interface: fs.createReadStream() method is expected')
+send.errors = errors
 /**
  * Initialize a `SendStream` with the given `path`.
  *
@@ -101,6 +105,16 @@ function SendStream (req, path, options) {
   this.options = opts
   this.path = path
   this.req = req
+  this.fs = opts.fs || fs
+
+  // Checking if provided "fs" is compatible
+  if (!typeof this.fs.stat === `function`) {
+    throw errors.INVALID_OPTION_FS_STAT
+  }
+
+  if (!typeof this.fs.createReadStream === `function`) {
+    throw errors.INVALID_OPTION_FS_CRTSTRM
+  }
 
   this._acceptRanges = opts.acceptRanges !== undefined
     ? Boolean(opts.acceptRanges)
@@ -718,7 +732,7 @@ SendStream.prototype.sendFile = function sendFile (path) {
   var self = this
 
   debug('stat "%s"', path)
-  fs.stat(path, function onstat (err, stat) {
+  this.fs.stat(path, function onstat (err, stat) {
     if (err && err.code === 'ENOENT' && !extname(path) && path[path.length - 1] !== sep) {
       // not found, check extensions
       return next(err)
@@ -739,7 +753,7 @@ SendStream.prototype.sendFile = function sendFile (path) {
     var p = path + '.' + self._extensions[i++]
 
     debug('stat "%s"', p)
-    fs.stat(p, function (err, stat) {
+    self.fs.stat(p, function (err, stat) {
       if (err) return next(err)
       if (stat.isDirectory()) return next()
       self.emit('file', p, stat)
@@ -767,7 +781,7 @@ SendStream.prototype.sendIndex = function sendIndex (path) {
     var p = join(path, self._index[i])
 
     debug('stat "%s"', p)
-    fs.stat(p, function (err, stat) {
+    self.fs.stat(p, function (err, stat) {
       if (err) return next(err)
       if (stat.isDirectory()) return next()
       self.emit('file', p, stat)
@@ -793,7 +807,7 @@ SendStream.prototype.stream = function stream (path, options) {
   var res = this.res
 
   // pipe
-  var stream = fs.createReadStream(path, options)
+  var stream = this.fs.createReadStream(path, options)
   this.emit('stream', stream)
   stream.pipe(res)
 
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..e6bd9ea
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,2199 @@
+{
+  "name": "send",
+  "version": "0.16.2",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.0.0.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.0.0"
+      }
+    },
+    "@babel/highlight": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@babel/highlight/-/highlight-7.0.0.tgz",
+      "integrity": "sha512-UFMC4ZeFC48Tpvj7C8UgLvtkaUuovQX+5xNWrsIoMG8o2z+XFKjKaN9iVmS84dPwVN00W4wPmqvYoZF3EGAsfw==",
+      "dev": true,
+      "requires": {
+        "chalk": "^2.0.0",
+        "esutils": "^2.0.2",
+        "js-tokens": "^4.0.0"
+      }
+    },
+    "abbrev": {
+      "version": "1.0.9",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz",
+      "integrity": "sha1-kbR5JYinc4wl813W9jdSovh3YTU=",
+      "dev": true
+    },
+    "acorn": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-6.1.0.tgz",
+      "integrity": "sha512-MW/FjM+IvU9CgBzjO3UIPCE2pyEwUsoFl+VGdczOPEdxfGFjuKny/gN54mOuX7Qxmb9Rg9MCn2oKiSUeW+pjrw==",
+      "dev": true
+    },
+    "acorn-jsx": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-5.0.1.tgz",
+      "integrity": "sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==",
+      "dev": true
+    },
+    "after": {
+      "version": "0.8.2",
+      "resolved": "https://registry.npmjs.org/after/-/after-0.8.2.tgz",
+      "integrity": "sha1-/ts5T58OAqqXaOcCvaI7UF+ufh8=",
+      "dev": true
+    },
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+      "version": "6.9.1",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.9.1.tgz",
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+      "dev": true,
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+        "fast-json-stable-stringify": "^2.0.0",
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+      }
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+      "integrity": "sha1-SlKCrBZHKek2Gbz9OtFR+BfOkfU=",
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+      }
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+      "resolved": "https://registry.npmjs.org/unist-util-visit/-/unist-util-visit-1.4.0.tgz",
+      "integrity": "sha512-FiGu34ziNsZA3ZUteZxSFaczIjGmksfSgdKqBfOejrrfzyUy5b7YrlzT1Bcvi+djkYDituJDy2XB7tGTeBieKw==",
+      "dev": true,
+      "requires": {
+        "unist-util-visit-parents": "^2.0.0"
+      }
+    },
+    "unist-util-visit-parents": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/unist-util-visit-parents/-/unist-util-visit-parents-2.0.1.tgz",
+      "integrity": "sha512-6B0UTiMfdWql4cQ03gDTCSns+64Zkfo2OCbK31Ov0uMizEz+CJeAp0cgZVb5Fhmcd7Bct2iRNywejT0orpbqUA==",
+      "dev": true,
+      "requires": {
+        "unist-util-is": "^2.1.2"
+      }
+    },
+    "uri-js": {
+      "version": "4.2.2",
+      "resolved": "https://registry.npmjs.org/uri-js/-/uri-js-4.2.2.tgz",
+      "integrity": "sha512-KY9Frmirql91X2Qgjry0Wd4Y+YTdrdZheS8TFwvkbLWf/G5KNJDCh6pKL5OZctEW4+0Baa5idK2ZQuELRwPznQ==",
+      "dev": true,
+      "requires": {
+        "punycode": "^2.1.0"
+      }
+    },
+    "util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
+    },
+    "validate-npm-package-license": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/validate-npm-package-license/-/validate-npm-package-license-3.0.4.tgz",
+      "integrity": "sha512-DpKm2Ui/xN7/HQKCtpZxoRWBhZ9Z0kqtygG8XCgNQ8ZlDnxuQmWhj566j8fN4Cu3/JmbhsDo7fcAJq4s9h27Ew==",
+      "dev": true,
+      "requires": {
+        "spdx-correct": "^3.0.0",
+        "spdx-expression-parse": "^3.0.0"
+      }
+    },
+    "vfile": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/vfile/-/vfile-2.3.0.tgz",
+      "integrity": "sha512-ASt4mBUHcTpMKD/l5Q+WJXNtshlWxOogYyGYYrg4lt/vuRjC1EFQtlAofL5VmtVNIZJzWYFJjzGWZ0Gw8pzW1w==",
+      "dev": true,
+      "requires": {
+        "is-buffer": "^1.1.4",
+        "replace-ext": "1.0.0",
+        "unist-util-stringify-position": "^1.0.0",
+        "vfile-message": "^1.0.0"
+      }
+    },
+    "vfile-location": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/vfile-location/-/vfile-location-2.0.4.tgz",
+      "integrity": "sha512-KRL5uXQPoUKu+NGvQVL4XLORw45W62v4U4gxJ3vRlDfI9QsT4ZN1PNXn/zQpKUulqGDpYuT0XDfp5q9O87/y/w==",
+      "dev": true
+    },
+    "vfile-message": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/vfile-message/-/vfile-message-1.1.1.tgz",
+      "integrity": "sha512-1WmsopSGhWt5laNir+633LszXvZ+Z/lxveBf6yhGsqnQIhlhzooZae7zV6YVM1Sdkw68dtAW3ow0pOdPANugvA==",
+      "dev": true,
+      "requires": {
+        "unist-util-stringify-position": "^1.1.1"
+      }
+    },
+    "which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "requires": {
+        "isexe": "^2.0.0"
+      }
+    },
+    "wordwrap": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
+      "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=",
+      "dev": true
+    },
+    "wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=",
+      "dev": true
+    },
+    "write": {
+      "version": "0.2.1",
+      "resolved": "https://registry.npmjs.org/write/-/write-0.2.1.tgz",
+      "integrity": "sha1-X8A4KOJkzqP+kUVUdvejxWbLB1c=",
+      "dev": true,
+      "requires": {
+        "mkdirp": "^0.5.1"
+      }
+    },
+    "x-is-string": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/x-is-string/-/x-is-string-0.1.0.tgz",
+      "integrity": "sha1-R0tQhlrzpJqcRlfwWs0UVFj3fYI=",
+      "dev": true
+    },
+    "xtend": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
+    }
+  }
+}
diff --git a/package.json b/package.json
index e7c2502..5af0e2f 100644
--- a/package.json
+++ b/package.json
@@ -40,6 +40,7 @@
     "eslint-plugin-promise": "4.0.1",
     "eslint-plugin-standard": "4.0.0",
     "istanbul": "0.4.5",
+    "memfs": "^2.15.1",
     "mocha": "5.2.0",
     "supertest": "3.3.0"
   },
@@ -55,6 +56,7 @@
   "scripts": {
     "lint": "eslint --plugin markdown --ext js,md .",
     "test": "mocha --check-leaks --reporter spec --bail",
+    "test:m": "mocha --check-leaks --reporter spec --bail ./test/send.mem.js",
     "test-ci": "istanbul cover node_modules/mocha/bin/_mocha --report lcovonly -- --check-leaks --reporter spec",
     "test-cov": "istanbul cover node_modules/mocha/bin/_mocha -- --check-leaks --reporter dot"
   }
diff --git a/test/send.js b/test/send.js
index 7586fb4..d1a2eb8 100644
--- a/test/send.js
+++ b/test/send.js
@@ -1,29 +1,34 @@
 
 process.env.NO_DEPRECATION = 'send'
 
-var after = require('after')
-var assert = require('assert')
-var fs = require('fs')
 var http = require('http')
 var path = require('path')
+var after = require('after')
+var assert = require('assert')
 var request = require('supertest')
+var hdd = require('fs')
 var send = require('..')
 
-// test server
-
 var dateRegExp = /^\w{3}, \d+ \w+ \d+ \d+:\d+:\d+ \w+$/
-var fixtures = path.join(__dirname, 'fixtures')
+var fixturesPath = path.join(__dirname, 'fixtures')
+
+// test server
 var app = http.createServer(function (req, res) {
   function error (err) {
     res.statusCode = err.status
     res.end(http.STATUS_CODES[err.status])
   }
 
-  send(req, req.url, { root: fixtures })
+  send(req, req.url, { root: fixturesPath, fs: global.fs })
     .on('error', error)
     .pipe(res)
 })
 
+// Provide basic config for testing
+global.app = app
+global.fixturesPath = fixturesPath
+global.fs = global.fs || hdd
+
 describe('send(file).pipe(res)', function () {
   it('should stream the file contents', function (done) {
     request(app)
@@ -73,7 +78,7 @@ describe('send(file).pipe(res)', function () {
   it('should handle headers already sent error', function (done) {
     var app = http.createServer(function (req, res) {
       res.write('0')
-      send(req, req.url, { root: fixtures })
+      send(req, req.url, { root: fixturesPath, fs: global.fs })
         .on('error', function (err) { res.end(' - ' + err.message) })
         .pipe(res)
     })
@@ -124,7 +129,7 @@ describe('send(file).pipe(res)', function () {
 
   it('should emit ENOENT if the file does not exist', function (done) {
     var app = http.createServer(function (req, res) {
-      send(req, req.url, { root: fixtures })
+      send(req, req.url, { root: fixturesPath, fs: global.fs })
         .on('error', function (err) { res.end(err.statusCode + ' ' + err.code) })
         .pipe(res)
     })
@@ -137,7 +142,7 @@ describe('send(file).pipe(res)', function () {
   it('should not override content-type', function (done) {
     var app = http.createServer(function (req, res) {
       res.setHeader('Content-Type', 'application/x-custom')
-      send(req, req.url, { root: fixtures }).pipe(res)
+      send(req, req.url, { root: fixturesPath, fs: global.fs }).pipe(res)
     })
     request(app)
       .get('/name.txt')
@@ -196,7 +201,7 @@ describe('send(file).pipe(res)', function () {
     it('should fire when sending file', function (done) {
       var cb = after(2, done)
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', function () { cb() })
           .pipe(res)
       })
@@ -209,7 +214,7 @@ describe('send(file).pipe(res)', function () {
     it('should not fire on 404', function (done) {
       var cb = after(1, done)
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', function () { cb() })
           .pipe(res)
       })
@@ -222,7 +227,7 @@ describe('send(file).pipe(res)', function () {
     it('should fire on index', function (done) {
       var cb = after(2, done)
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', function () { cb() })
           .pipe(res)
       })
@@ -235,7 +240,7 @@ describe('send(file).pipe(res)', function () {
     it('should not fire on redirect', function (done) {
       var cb = after(1, done)
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', function () { cb() })
           .pipe(res)
       })
@@ -248,14 +253,14 @@ describe('send(file).pipe(res)', function () {
     it('should provide path', function (done) {
       var cb = after(2, done)
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', onHeaders)
           .pipe(res)
       })
 
       function onHeaders (res, filePath) {
         assert.ok(filePath)
-        assert.strictEqual(path.normalize(filePath), path.normalize(path.join(fixtures, 'name.txt')))
+        assert.strictEqual(path.normalize(filePath), path.normalize(path.join(fixturesPath, 'name.txt')))
         cb()
       }
 
@@ -267,7 +272,7 @@ describe('send(file).pipe(res)', function () {
     it('should provide stat', function (done) {
       var cb = after(2, done)
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', onHeaders)
           .pipe(res)
       })
@@ -286,7 +291,7 @@ describe('send(file).pipe(res)', function () {
 
     it('should allow altering headers', function (done) {
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('headers', onHeaders)
           .pipe(res)
       })
@@ -313,7 +318,7 @@ describe('send(file).pipe(res)', function () {
   describe('when "directory" listeners are present', function () {
     it('should be called when sending directory', function (done) {
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('directory', onDirectory)
           .pipe(res)
       })
@@ -330,7 +335,7 @@ describe('send(file).pipe(res)', function () {
 
     it('should be called with path', function (done) {
       var server = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .on('directory', onDirectory)
           .pipe(res)
       })
@@ -341,20 +346,20 @@ describe('send(file).pipe(res)', function () {
 
       request(server)
         .get('/pets')
-        .expect(200, path.normalize(path.join(fixtures, 'pets')), done)
+        .expect(200, path.normalize(path.join(fixturesPath, 'pets')), done)
     })
   })
 
   describe('when no "directory" listeners are present', function () {
     it('should redirect directories to trailing slash', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/pets')
         .expect('Location', '/pets/')
         .expect(301, done)
     })
 
     it('should respond with an HTML redirect', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/pets')
         .expect('Location', '/pets/')
         .expect('Content-Type', /html/)
@@ -362,7 +367,7 @@ describe('send(file).pipe(res)', function () {
     })
 
     it('should respond with default Content-Security-Policy', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/pets')
         .expect('Location', '/pets/')
         .expect('Content-Security-Policy', "default-src 'self'")
@@ -370,7 +375,7 @@ describe('send(file).pipe(res)', function () {
     })
 
     it('should not redirect to protocol-relative locations', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('//pets')
         .expect('Location', '/pets/')
         .expect(301, done)
@@ -392,20 +397,20 @@ describe('send(file).pipe(res)', function () {
 
   describe('when no "error" listeners are present', function () {
     it('should respond to errors directly', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/foobar')
         .expect(404, />Not Found</, done)
     })
 
     it('should respond with default Content-Security-Policy', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/foobar')
         .expect('Content-Security-Policy', "default-src 'self'")
         .expect(404, done)
     })
 
     it('should remove all previously-set headers', function (done) {
-      var server = createServer({ root: fixtures }, function (req, res) {
+      var server = createServer({ root: fixturesPath, fs: global.fs }, function (req, res) {
         res.setHeader('X-Foo', 'bar')
       })
 
@@ -418,7 +423,7 @@ describe('send(file).pipe(res)', function () {
 
   describe('with conditional-GET', function () {
     it('should remove Content headers with 304', function (done) {
-      var server = createServer({ root: fixtures }, function (req, res) {
+      var server = createServer({ root: fixturesPath, fs: global.fs }, function (req, res) {
         res.setHeader('Content-Language', 'en-US')
         res.setHeader('Content-Location', 'http://localhost/name.txt')
         res.setHeader('Contents', 'foo')
@@ -745,26 +750,26 @@ describe('send(file).pipe(res)', function () {
 
   describe('when "options" is specified', function () {
     it('should support start/end', function (done) {
-      request(createServer({ root: fixtures, start: 3, end: 5 }))
+      request(createServer({ root: fixturesPath, fs: global.fs, start: 3, end: 5 }))
         .get('/nums.txt')
         .expect(200, '456', done)
     })
 
     it('should adjust too large end', function (done) {
-      request(createServer({ root: fixtures, start: 3, end: 90 }))
+      request(createServer({ root: fixturesPath, fs: global.fs, start: 3, end: 90 }))
         .get('/nums.txt')
         .expect(200, '456789', done)
     })
 
     it('should support start/end with Range request', function (done) {
-      request(createServer({ root: fixtures, start: 0, end: 2 }))
+      request(createServer({ root: fixturesPath, fs: global.fs, start: 0, end: 2 }))
         .get('/nums.txt')
         .set('Range', 'bytes=-2')
         .expect(206, '23', done)
     })
 
     it('should support start/end with unsatisfiable Range request', function (done) {
-      request(createServer({ root: fixtures, start: 0, end: 2 }))
+      request(createServer({ root: fixturesPath, fs: global.fs, start: 0, end: 2 }))
         .get('/nums.txt')
         .set('Range', 'bytes=5-9')
         .expect('Content-Range', 'bytes */3')
@@ -775,7 +780,7 @@ describe('send(file).pipe(res)', function () {
   describe('.etag()', function () {
     it('should support disabling etags', function (done) {
       var app = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .etag(false)
           .pipe(res)
       })
@@ -791,7 +796,7 @@ describe('send(file).pipe(res)', function () {
     it('should set with deprecated from', function (done) {
       var app = http.createServer(function (req, res) {
         send(req, req.url)
-          .from(fixtures)
+          .from(fixturesPath)
           .pipe(res)
       })
 
@@ -804,7 +809,7 @@ describe('send(file).pipe(res)', function () {
   describe('.hidden()', function () {
     it('should default support sending hidden files', function (done) {
       var app = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .hidden(true)
           .pipe(res)
       })
@@ -818,7 +823,7 @@ describe('send(file).pipe(res)', function () {
   describe('.index()', function () {
     it('should be configurable', function (done) {
       var app = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .index('tobi.html')
           .pipe(res)
       })
@@ -830,7 +835,7 @@ describe('send(file).pipe(res)', function () {
 
     it('should support disabling', function (done) {
       var app = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .index(false)
           .pipe(res)
       })
@@ -842,14 +847,14 @@ describe('send(file).pipe(res)', function () {
 
     it('should support fallbacks', function (done) {
       var app = http.createServer(function (req, res) {
-        send(req, req.url, { root: fixtures })
+        send(req, req.url, { root: fixturesPath, fs: global.fs })
           .index(['default.htm', 'index.html'])
           .pipe(res)
       })
 
       request(app)
         .get('/pets/')
-        .expect(200, fs.readFileSync(path.join(fixtures, 'pets', 'index.html'), 'utf8'), done)
+        .expect(200, hdd.readFileSync(path.join(fixturesPath, 'pets', 'index.html'), 'utf8'), done)
     })
   })
 
@@ -907,7 +912,7 @@ describe('send(file).pipe(res)', function () {
     it('should set root', function (done) {
       var app = http.createServer(function (req, res) {
         send(req, req.url)
-          .root(fixtures)
+          .root(fixturesPath)
           .pipe(res)
       })
 
@@ -921,14 +926,14 @@ describe('send(file).pipe(res)', function () {
 describe('send(file, options)', function () {
   describe('acceptRanges', function () {
     it('should support disabling accept-ranges', function (done) {
-      request(createServer({ acceptRanges: false, root: fixtures }))
+      request(createServer({ acceptRanges: false, root: fixturesPath }))
         .get('/nums.txt')
         .expect(shouldNotHaveHeader('Accept-Ranges'))
         .expect(200, done)
     })
 
     it('should ignore requested range', function (done) {
-      request(createServer({ acceptRanges: false, root: fixtures }))
+      request(createServer({ acceptRanges: false, root: fixturesPath }))
         .get('/nums.txt')
         .set('Range', 'bytes=0-2')
         .expect(shouldNotHaveHeader('Accept-Ranges'))
@@ -939,14 +944,14 @@ describe('send(file, options)', function () {
 
   describe('cacheControl', function () {
     it('should support disabling cache-control', function (done) {
-      request(createServer({ cacheControl: false, root: fixtures }))
+      request(createServer({ cacheControl: false, root: fixturesPath }))
         .get('/name.txt')
         .expect(shouldNotHaveHeader('Cache-Control'))
         .expect(200, done)
     })
 
     it('should ignore maxAge option', function (done) {
-      request(createServer({ cacheControl: false, maxAge: 1000, root: fixtures }))
+      request(createServer({ cacheControl: false, maxAge: 1000, root: fixturesPath }))
         .get('/name.txt')
         .expect(shouldNotHaveHeader('Cache-Control'))
         .expect(200, done)
@@ -955,7 +960,7 @@ describe('send(file, options)', function () {
 
   describe('etag', function () {
     it('should support disabling etags', function (done) {
-      request(createServer({ etag: false, root: fixtures }))
+      request(createServer({ etag: false, root: fixturesPath }))
         .get('/name.txt')
         .expect(shouldNotHaveHeader('ETag'))
         .expect(200, done)
@@ -964,55 +969,55 @@ describe('send(file, options)', function () {
 
   describe('extensions', function () {
     it('should reject numbers', function (done) {
-      request(createServer({ extensions: 42, root: fixtures }))
+      request(createServer({ extensions: 42, root: fixturesPath }))
         .get('/pets/')
         .expect(500, /TypeError: extensions option/, done)
     })
 
     it('should reject true', function (done) {
-      request(createServer({ extensions: true, root: fixtures }))
+      request(createServer({ extensions: true, root: fixturesPath }))
         .get('/pets/')
         .expect(500, /TypeError: extensions option/, done)
     })
 
     it('should be not be enabled by default', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/tobi')
         .expect(404, done)
     })
 
     it('should be configurable', function (done) {
-      request(createServer({ extensions: 'txt', root: fixtures }))
+      request(createServer({ extensions: 'txt', root: fixturesPath }))
         .get('/name')
         .expect(200, 'tobi', done)
     })
 
     it('should support disabling extensions', function (done) {
-      request(createServer({ extensions: false, root: fixtures }))
+      request(createServer({ extensions: false, root: fixturesPath }))
         .get('/name')
         .expect(404, done)
     })
 
     it('should support fallbacks', function (done) {
-      request(createServer({ extensions: ['htm', 'html', 'txt'], root: fixtures }))
+      request(createServer({ extensions: ['htm', 'html', 'txt'], root: fixturesPath }))
         .get('/name')
         .expect(200, '<p>tobi</p>', done)
     })
 
     it('should 404 if nothing found', function (done) {
-      request(createServer({ extensions: ['htm', 'html', 'txt'], root: fixtures }))
+      request(createServer({ extensions: ['htm', 'html', 'txt'], root: fixturesPath }))
         .get('/bob')
         .expect(404, done)
     })
 
     it('should skip directories', function (done) {
-      request(createServer({ extensions: ['file', 'dir'], root: fixtures }))
+      request(createServer({ extensions: ['file', 'dir'], root: fixturesPath }))
         .get('/name')
         .expect(404, done)
     })
 
     it('should not search if file has extension', function (done) {
-      request(createServer({ extensions: 'html', root: fixtures }))
+      request(createServer({ extensions: 'html', root: fixturesPath }))
         .get('/thing.html')
         .expect(404, done)
     })
@@ -1020,7 +1025,7 @@ describe('send(file, options)', function () {
 
   describe('lastModified', function () {
     it('should support disabling last-modified', function (done) {
-      request(createServer({ lastModified: false, root: fixtures }))
+      request(createServer({ lastModified: false, root: fixturesPath }))
         .get('/name.txt')
         .expect(shouldNotHaveHeader('Last-Modified'))
         .expect(200, done)
@@ -1029,7 +1034,7 @@ describe('send(file, options)', function () {
 
   describe('from', function () {
     it('should set with deprecated from', function (done) {
-      request(createServer({ from: fixtures }))
+      request(createServer({ from: fixturesPath }))
         .get('/pets/../name.txt')
         .expect(200, 'tobi', done)
     })
@@ -1037,13 +1042,13 @@ describe('send(file, options)', function () {
 
   describe('dotfiles', function () {
     it('should default to "ignore"', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/.hidden.txt')
         .expect(404, done)
     })
 
     it('should allow file within dotfile directory for back-compat', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/.mine/name.txt')
         .expect(200, /tobi/, done)
     })
@@ -1056,19 +1061,19 @@ describe('send(file, options)', function () {
 
     describe('when "allow"', function (done) {
       it('should send dotfile', function (done) {
-        request(createServer({ dotfiles: 'allow', root: fixtures }))
+        request(createServer({ dotfiles: 'allow', root: fixturesPath }))
           .get('/.hidden.txt')
           .expect(200, 'secret', done)
       })
 
       it('should send within dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'allow', root: fixtures }))
+        request(createServer({ dotfiles: 'allow', root: fixturesPath }))
           .get('/.mine/name.txt')
           .expect(200, /tobi/, done)
       })
 
       it('should 404 for non-existent dotfile', function (done) {
-        request(createServer({ dotfiles: 'allow', root: fixtures }))
+        request(createServer({ dotfiles: 'allow', root: fixturesPath }))
           .get('/.nothere')
           .expect(404, done)
       })
@@ -1076,62 +1081,62 @@ describe('send(file, options)', function () {
 
     describe('when "deny"', function (done) {
       it('should 403 for dotfile', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.hidden.txt')
           .expect(403, done)
       })
 
       it('should 403 for dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.mine')
           .expect(403, done)
       })
 
       it('should 403 for dotfile directory with trailing slash', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.mine/')
           .expect(403, done)
       })
 
       it('should 403 for file within dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.mine/name.txt')
           .expect(403, done)
       })
 
       it('should 403 for non-existent dotfile', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.nothere')
           .expect(403, done)
       })
 
       it('should 403 for non-existent dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.what/name.txt')
           .expect(403, done)
       })
 
       it('should 403 for dotfile in directory', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/pets/.hidden')
           .expect(403, done)
       })
 
       it('should 403 for dotfile in dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'deny', root: fixtures }))
+        request(createServer({ dotfiles: 'deny', root: fixturesPath }))
           .get('/.mine/.hidden')
           .expect(403, done)
       })
 
       it('should send files in root dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'deny', root: path.join(fixtures, '.mine') }))
+        request(createServer({ dotfiles: 'deny', root: path.join(fixturesPath, '.mine') }))
           .get('/name.txt')
           .expect(200, /tobi/, done)
       })
 
       it('should 403 for dotfile without root', function (done) {
         var server = http.createServer(function onRequest (req, res) {
-          send(req, fixtures + '/.mine' + req.url, { dotfiles: 'deny' }).pipe(res)
+          send(req, fixturesPath + '/.mine' + req.url, { dotfiles: 'deny' }).pipe(res)
         })
 
         request(server)
@@ -1142,50 +1147,50 @@ describe('send(file, options)', function () {
 
     describe('when "ignore"', function (done) {
       it('should 404 for dotfile', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: fixtures }))
+        request(createServer({ dotfiles: 'ignore', root: fixturesPath }))
           .get('/.hidden.txt')
           .expect(404, done)
       })
 
       it('should 404 for dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: fixtures }))
+        request(createServer({ dotfiles: 'ignore', root: fixturesPath }))
           .get('/.mine')
           .expect(404, done)
       })
 
       it('should 404 for dotfile directory with trailing slash', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: fixtures }))
+        request(createServer({ dotfiles: 'ignore', root: fixturesPath }))
           .get('/.mine/')
           .expect(404, done)
       })
 
       it('should 404 for file within dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: fixtures }))
+        request(createServer({ dotfiles: 'ignore', root: fixturesPath }))
           .get('/.mine/name.txt')
           .expect(404, done)
       })
 
       it('should 404 for non-existent dotfile', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: fixtures }))
+        request(createServer({ dotfiles: 'ignore', root: fixturesPath }))
           .get('/.nothere')
           .expect(404, done)
       })
 
       it('should 404 for non-existent dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: fixtures }))
+        request(createServer({ dotfiles: 'ignore', root: fixturesPath }))
           .get('/.what/name.txt')
           .expect(404, done)
       })
 
       it('should send files in root dotfile directory', function (done) {
-        request(createServer({ dotfiles: 'ignore', root: path.join(fixtures, '.mine') }))
+        request(createServer({ dotfiles: 'ignore', root: path.join(fixturesPath, '.mine') }))
           .get('/name.txt')
           .expect(200, /tobi/, done)
       })
 
       it('should 404 for dotfile without root', function (done) {
         var server = http.createServer(function onRequest (req, res) {
-          send(req, fixtures + '/.mine' + req.url, { dotfiles: 'ignore' }).pipe(res)
+          send(req, fixturesPath + '/.mine' + req.url, { dotfiles: 'ignore' }).pipe(res)
         })
 
         request(server)
@@ -1203,7 +1208,7 @@ describe('send(file, options)', function () {
     })
 
     it('should default support sending hidden files', function (done) {
-      request(createServer({ hidden: true, root: fixtures }))
+      request(createServer({ hidden: true, root: fixturesPath }))
         .get('/.hidden.txt')
         .expect(200, 'secret', done)
     })
@@ -1211,13 +1216,13 @@ describe('send(file, options)', function () {
 
   describe('immutable', function () {
     it('should default to false', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/name.txt')
         .expect('Cache-Control', 'public, max-age=0', done)
     })
 
     it('should set immutable directive in Cache-Control', function (done) {
-      request(createServer({ immutable: true, maxAge: '1h', root: fixtures }))
+      request(createServer({ immutable: true, maxAge: '1h', root: fixturesPath }))
         .get('/name.txt')
         .expect('Cache-Control', 'public, max-age=3600, immutable', done)
     })
@@ -1225,25 +1230,25 @@ describe('send(file, options)', function () {
 
   describe('maxAge', function () {
     it('should default to 0', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/name.txt')
         .expect('Cache-Control', 'public, max-age=0', done)
     })
 
     it('should floor to integer', function (done) {
-      request(createServer({ maxAge: 123956, root: fixtures }))
+      request(createServer({ maxAge: 123956, root: fixturesPath }))
         .get('/name.txt')
         .expect('Cache-Control', 'public, max-age=123', done)
     })
 
     it('should accept string', function (done) {
-      request(createServer({ maxAge: '30d', root: fixtures }))
+      request(createServer({ maxAge: '30d', root: fixturesPath }))
         .get('/name.txt')
         .expect('Cache-Control', 'public, max-age=2592000', done)
     })
 
     it('should max at 1 year', function (done) {
-      request(createServer({ maxAge: '2y', root: fixtures }))
+      request(createServer({ maxAge: '2y', root: fixturesPath }))
         .get('/name.txt')
         .expect('Cache-Control', 'public, max-age=31536000', done)
     })
@@ -1251,62 +1256,62 @@ describe('send(file, options)', function () {
 
   describe('index', function () {
     it('should reject numbers', function (done) {
-      request(createServer({ root: fixtures, index: 42 }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: 42 }))
         .get('/pets/')
         .expect(500, /TypeError: index option/, done)
     })
 
     it('should reject true', function (done) {
-      request(createServer({ root: fixtures, index: true }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: true }))
         .get('/pets/')
         .expect(500, /TypeError: index option/, done)
     })
 
     it('should default to index.html', function (done) {
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/pets/')
-        .expect(fs.readFileSync(path.join(fixtures, 'pets', 'index.html'), 'utf8'), done)
+        .expect(hdd.readFileSync(path.join(fixturesPath, 'pets', 'index.html'), 'utf8'), done)
     })
 
     it('should be configurable', function (done) {
-      request(createServer({ root: fixtures, index: 'tobi.html' }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: 'tobi.html' }))
         .get('/')
         .expect(200, '<p>tobi</p>', done)
     })
 
     it('should support disabling', function (done) {
-      request(createServer({ root: fixtures, index: false }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: false }))
         .get('/pets/')
         .expect(403, done)
     })
 
     it('should support fallbacks', function (done) {
-      request(createServer({ root: fixtures, index: ['default.htm', 'index.html'] }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: ['default.htm', 'index.html'] }))
         .get('/pets/')
-        .expect(200, fs.readFileSync(path.join(fixtures, 'pets', 'index.html'), 'utf8'), done)
+        .expect(200, hdd.readFileSync(path.join(fixturesPath, 'pets', 'index.html'), 'utf8'), done)
     })
 
     it('should 404 if no index file found (file)', function (done) {
-      request(createServer({ root: fixtures, index: 'default.htm' }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: 'default.htm' }))
         .get('/pets/')
         .expect(404, done)
     })
 
     it('should 404 if no index file found (dir)', function (done) {
-      request(createServer({ root: fixtures, index: 'pets' }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: 'pets' }))
         .get('/')
         .expect(404, done)
     })
 
     it('should not follow directories', function (done) {
-      request(createServer({ root: fixtures, index: ['pets', 'name.txt'] }))
+      request(createServer({ root: fixturesPath, fs: global.fs, index: ['pets', 'name.txt'] }))
         .get('/')
         .expect(200, 'tobi', done)
     })
 
     it('should work without root', function (done) {
       var server = http.createServer(function (req, res) {
-        var p = path.join(fixtures, 'pets').replace(/\\/g, '/') + '/'
+        var p = path.join(fixturesPath, 'pets').replace(/\\/g, '/') + '/'
         send(req, p, { index: ['index.html'] })
           .pipe(res)
       })
@@ -1320,14 +1325,14 @@ describe('send(file, options)', function () {
   describe('root', function () {
     describe('when given', function () {
       it('should join root', function (done) {
-        request(createServer({ root: fixtures }))
+        request(createServer({ root: fixturesPath, fs: global.fs }))
           .get('/pets/../name.txt')
           .expect(200, 'tobi', done)
       })
 
       it('should work with trailing slash', function (done) {
         var app = http.createServer(function (req, res) {
-          send(req, req.url, { root: fixtures + '/' })
+          send(req, req.url, { root: fixturesPath + '/', fs: global.fs })
             .pipe(res)
         })
 
@@ -1338,7 +1343,7 @@ describe('send(file, options)', function () {
 
       it('should work with empty path', function (done) {
         var app = http.createServer(function (req, res) {
-          send(req, '', { root: fixtures })
+          send(req, '', { root: fixturesPath, fs: global.fs })
             .pipe(res)
         })
 
@@ -1355,7 +1360,7 @@ describe('send(file, options)', function () {
       //
       it('should try as file with empty path', function (done) {
         var app = http.createServer(function (req, res) {
-          send(req, '', { root: path.join(fixtures, 'name.txt') })
+          send(req, '', { root: path.join(fixturesPath, 'name.txt') })
             .pipe(res)
         })
 
@@ -1365,14 +1370,14 @@ describe('send(file, options)', function () {
       })
 
       it('should restrict paths to within root', function (done) {
-        request(createServer({ root: fixtures }))
+        request(createServer({ root: fixturesPath, fs: global.fs }))
           .get('/pets/../../send.js')
           .expect(403, done)
       })
 
       it('should allow .. in root', function (done) {
         var app = http.createServer(function (req, res) {
-          send(req, req.url, { root: fixtures + '/../fixtures' })
+          send(req, req.url, { root: fixturesPath + '/../fixtures', fs: global.fs })
             .pipe(res)
         })
 
@@ -1382,13 +1387,13 @@ describe('send(file, options)', function () {
       })
 
       it('should not allow root transversal', function (done) {
-        request(createServer({ root: path.join(fixtures, 'name.d') }))
+        request(createServer({ root: path.join(fixturesPath, 'name.d') }))
           .get('/../name.dir/name.txt')
           .expect(403, done)
       })
 
       it('should not allow root path disclosure', function (done) {
-        request(createServer({ root: fixtures }))
+        request(createServer({ root: fixturesPath, fs: global.fs }))
           .get('/pets/../../fixtures/name.txt')
           .expect(403, done)
       })
@@ -1397,7 +1402,7 @@ describe('send(file, options)', function () {
     describe('when missing', function () {
       it('should consider .. malicious', function (done) {
         var app = http.createServer(function (req, res) {
-          send(req, fixtures + req.url)
+          send(req, fixturesPath + req.url)
             .pipe(res)
         })
 
@@ -1408,7 +1413,7 @@ describe('send(file, options)', function () {
 
       it('should still serve files with dots in name', function (done) {
         var app = http.createServer(function (req, res) {
-          send(req, fixtures + req.url)
+          send(req, fixturesPath + req.url)
             .pipe(res)
         })
 
@@ -1437,7 +1442,7 @@ describe('send.mime', function () {
     it('should change the default type', function (done) {
       send.mime.default_type = 'text/plain'
 
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/no_ext')
         .expect('Content-Type', 'text/plain; charset=UTF-8')
         .expect(200, done)
@@ -1446,7 +1451,7 @@ describe('send.mime', function () {
     it('should not add Content-Type for undefined default', function (done) {
       send.mime.default_type = undefined
 
-      request(createServer({ root: fixtures }))
+      request(createServer({ root: fixturesPath, fs: global.fs }))
         .get('/no_ext')
         .expect(shouldNotHaveHeader('Content-Type'))
         .expect(200, done)
diff --git a/test/send.mem.js b/test/send.mem.js
new file mode 100644
index 0000000..73ee6e2
--- /dev/null
+++ b/test/send.mem.js
@@ -0,0 +1,39 @@
+var path = require('path')
+var HDDfs = require('fs')
+var memfs = require('memfs')
+var fs = memfs.fs // require('memory-fs')
+var fixturesPath = path.join(__dirname, 'fixtures')
+
+global.fs = fs
+// @param {object} - fs instance
+// @param {string} - full path
+// @return {string[]} - full file paths
+function getFiles (fs, fullPath, { r } = { r: true }) {
+  var files = []
+  fs.readdirSync(fullPath, { withFileTypes: true })
+    .forEach(function (dir) {
+      var p = path.join(fullPath, path.sep, dir.name)
+      if (r && dir.isDirectory()) {
+        files = files.concat(getFiles(fs, p))
+      } else if (dir.isFile()) {
+        files.push(p)
+      }
+    })
+  return files
+}
+
+// Get all files and dirs under fixtures
+var allFixtures = HDDfs.readdirSync(fixturesPath, { withFileTypes: true })
+var dirs = allFixtures.filter(dir => dir.isDirectory()).map(d => d.name)
+var files = getFiles(HDDfs, fixturesPath)
+
+// Preparing directories
+fs.mkdirSync(fixturesPath, { recursive: true })
+dirs.forEach(function (dir) { fs.mkdirSync(path.join(fixturesPath, dir)) })
+
+// Moving all files from hdd into virtual memory
+files.forEach(function (filePath) {
+  fs.writeFileSync(filePath, HDDfs.readFileSync(filePath))
+})
+
+require('./send.js')