diff --git a/.eslintignore b/.eslintignore
index 64c29f3..a515666 100755
--- a/.eslintignore
+++ b/.eslintignore
@@ -3,3 +3,4 @@ node_modules
 commitizen.config.js
 commitlint.config.js
 coverage
+docs
diff --git a/.eslintrc.js b/.eslintrc.js
index 1432ca6..050991d 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -7,8 +7,14 @@ module.exports = {
   parserOptions: {
     ecmaVersion: 2017,
   },
-  plugins: ['prettier', 'jsdoc'],
-  extends: ['eslint:recommended', 'airbnb-base', 'plugin:prettier/recommended'],
+  plugins: ['prettier', 'jsdoc', 'promise', 'sonarjs'],
+  extends: [
+    'plugin:promise/recommended',
+    'plugin:sonarjs/recommended',
+    'eslint:recommended',
+    'airbnb-base',
+    'plugin:prettier/recommended',
+  ],
   rules: {
     // Only allow debugger in development
     'no-debugger': process.env.PRE_COMMIT ? 'error' : 'off',
@@ -59,5 +65,7 @@ module.exports = {
     'jsdoc/require-returns-description': 'off',
     'jsdoc/require-returns-type': 'warn',
     'jsdoc/valid-types': 'warn',
+    'promise/prefer-await-to-then': 'warn',
+    'promise/prefer-await-to-callbacks': 'warn',
   },
 };
diff --git a/.prettierignore b/.prettierignore
index 3e372f0..ca98ee0 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -1,2 +1,3 @@
 /node_modules/**
 **/output.css
+docs
diff --git a/README.md b/README.md
index c428cb9..ed28e3a 100644
--- a/README.md
+++ b/README.md
@@ -14,7 +14,7 @@ Projects with a large number of sprites can take a long time to compile. The hel
 
 ## Relative/absolute paths
 
-The plugin supports both relative andabsolute paths on input file, but can currently only [generate relative paths on output file](https://github.com/glebmachine/postcss-easysprites/issues/4).
+The plugin supports both relative and absolute paths on input file, but can currently only [generate relative paths on output file](https://github.com/glebmachine/postcss-easysprites/issues/4).
 
 ## Plugin options
 
diff --git a/commitizen.config.js b/commitizen.config.js
index 01422e1..c6aa832 100644
--- a/commitizen.config.js
+++ b/commitizen.config.js
@@ -46,7 +46,6 @@ const scopes = [
   'gulp',
   'jest',
   'jsdoc',
-  'lodash',
   'mocha',
   'nodejs',
   'npm',
diff --git a/index.js b/index.js
index c815578..ba7d717 100755
--- a/index.js
+++ b/index.js
@@ -13,31 +13,20 @@ const { mapSpritesProperties, saveSprites } = require('./lib/sprites');
  * @param {processOptions} [options] Options passed to the plugin.
  */
 module.exports = postcss.plugin('postcss-easysprites', (options) => {
-  return (css) => {
+  return async (css) => {
     // Setup options.
     pluginOptions.init(options, css.source.input.file);
 
-    return Promise.all([collectImages(css)])
-      .then(([images]) => {
-        return addSpriteGroups(images);
-      })
-      .then(([images]) => {
-        return setTokens(images, css);
-      })
-      .then(([images]) => {
-        return runSpritesmith(images);
-      })
-      .then(([images, sprites]) => {
-        return saveSprites(images, sprites);
-      })
-      .then(([images, sprites]) => {
-        return mapSpritesProperties(images, sprites);
-      })
-      .then(([images, sprites]) => {
-        return updateReferences(images, sprites, css);
-      })
-      .catch((err) => {
-        throw new Error(err);
-      });
+    try {
+      const images = await collectImages(css);
+      await addSpriteGroups(images);
+      await setTokens(images, css);
+      const sprites = await runSpritesmith(images);
+      await saveSprites(images, sprites);
+      await mapSpritesProperties(images, sprites);
+      await updateReferences(images, sprites, css);
+    } catch (error) {
+      throw new Error(error);
+    }
   };
 });
diff --git a/jsdoc.conf.json b/jsdoc.conf.json
new file mode 100644
index 0000000..520d157
--- /dev/null
+++ b/jsdoc.conf.json
@@ -0,0 +1,25 @@
+{
+  "plugins": [],
+  "recurseDepth": 10,
+  "source": {
+    "include": ["lib"],
+    "includePattern": ".+\\.js(doc|x)?$",
+    "excludePattern": "(^|\\/|\\\\)_"
+  },
+  "sourceType": "module",
+  "tags": {
+    "allowUnknownTags": true,
+    "dictionaries": ["jsdoc", "closure"]
+  },
+  "templates": {
+    "cleverLinks": false,
+    "monospaceLinks": false
+  },
+  "opts": {
+    "template": "templates/default",
+    "encoding": "utf8",
+    "destination": "./docs/",
+    "recurse": true,
+    "readme": "README.md"
+  }
+}
diff --git a/lib/cache.js b/lib/cache.js
index bac379c..47b54fa 100644
--- a/lib/cache.js
+++ b/lib/cache.js
@@ -1,5 +1,9 @@
 const fs = require('fs');
 const md5 = require('md5');
+const { promisify } = require('util');
+
+const readFileAsync = promisify(fs.readFile);
+
 /**
  * Custom module to cache sprite images so unchanged sprites don't need to be
  * processed by Spritesmith.
@@ -8,12 +12,24 @@ const cache = {
   cache: {},
   cacheIndex: {},
 
-  createCacheHash(imagePaths) {
-    const cacheHashes = imagePaths.map((imagePath) => {
-      return `${imagePath}=${md5(fs.readFileSync(imagePath).toString())}`;
+  async createCacheHash(imagePaths) {
+    const allPromisedCacheHashes = imagePaths.map(async (imagePath) => {
+      try {
+        const image = await readFileAsync(imagePath);
+        return `${imagePath}=${md5(image.toString())}`;
+      } catch (error) {
+        return undefined;
+      }
     });
 
-    return md5(cacheHashes.sort().join('&'));
+    const cacheHashes = await Promise.all(allPromisedCacheHashes);
+
+    const hashString = cacheHashes
+      .filter((cacheHash) => cacheHash)
+      .sort()
+      .join('&');
+
+    return hashString ? md5(hashString) : undefined;
   },
   getCache() {
     return this.cache;
diff --git a/lib/collect-images.js b/lib/collect-images.js
index f78d7bb..2f046bb 100644
--- a/lib/collect-images.js
+++ b/lib/collect-images.js
@@ -1,12 +1,12 @@
 const fs = require('fs');
 const { promisify } = require('util');
 const ansi = require('ansi-colors');
-const lodash = require('lodash');
 const url = require('url');
+
+const fsAccessAsync = promisify(fs.access);
 const { log } = require('./log');
 const { isRetinaImage, getRetinaRatio } = require('./retina-images');
 const { pluginOptions } = require('./plugin-options');
-
 const {
   isLocalUrl,
   hasImageInRule,
@@ -66,46 +66,42 @@ function buildImageData(cssRule) {
  * @returns {boolean}
  */
 async function fileExistsAsync(path) {
-  const fsAccessAsync = promisify(fs.access);
-
-  const fileExists = await fsAccessAsync(path)
-    .then(() => true)
-    .catch(() => false);
-
-  return fileExists;
+  try {
+    await fsAccessAsync(path);
+    return true;
+  } catch (error) {
+    return false;
+  }
 }
 
 /**
  * Checks if a image actually exists.
  *
  * @param {object} image - Object of image properties.
- * @param {Array} ruleNodes - The css rule nodes.
- * @param {Array} images - The array of images that exist.
+ * @param {Array} rules - The css rule nodes.
  * @returns {Promise}
  */
-function imageExists(image, ruleNodes, images) {
-  return fileExistsAsync(image.path)
-    .then((result) => {
-      if (result) {
-        images.push(image);
-      } else {
-        log(
-          'Easysprites:',
-          ansi.red(image.path),
-          'file unreachable or does not exists'
-        );
-
-        // If the image file doesn't exist, clean up the background image URL's
-        // by removing hash suffix.
-        ruleNodes.forEach((node) => {
-          const nodeRule = node;
-          nodeRule.value = node.value.replace(`#${image.hash}`, '');
-        });
-      }
-    })
-    .catch((error) => {
-      throw new Error(error);
-    });
+async function imageExists(image, rules) {
+  const exists = await fileExistsAsync(image.path);
+
+  if (exists) {
+    return image;
+  }
+
+  log(
+    'Easysprites:',
+    ansi.red(image.path),
+    'file unreachable or does not exists'
+  );
+
+  // If the image file doesn't exist, clean up the background image URL's
+  // by removing hash suffix.
+  rules.forEach((node) => {
+    const nodeRule = node;
+    nodeRule.value = node.value.replace(`#${image.hash}`, '');
+  });
+
+  return undefined;
 }
 
 /**
@@ -114,31 +110,33 @@ function imageExists(image, ruleNodes, images) {
  * @param {object} css - Object with CSS results.
  * @returns {Array}
  */
-function collectImages(css) {
+async function collectImages(css) {
   const images = [];
-  let allImagesChecked;
 
-  return new Promise((resolve) => {
-    // Loop through all CSS rules.
-    css.walkRules((rule) => {
-      // Get the string representation of the PostCSS rule object.
-      const cssRule = rule.toString();
+  // Loop through all CSS rules.
+  css.walkRules((rule) => {
+    // Get the string representation of the PostCSS rule object.
+    const cssRule = rule.toString();
 
-      // Check if there is a `background(-image)` rule with a url() defined.
-      if (!hasImageInRule(cssRule)) return;
+    // Check if there is a `background(-image)` rule with a url() defined.
+    if (!hasImageInRule(cssRule)) return;
 
-      const image = buildImageData(cssRule);
-      if (!image) return;
+    const image = buildImageData(cssRule);
+    if (!image) return;
 
-      allImagesChecked = imageExists(image, rule.nodes, images);
-    });
-
-    return allImagesChecked
-      ? allImagesChecked.then(() => {
-          resolve(lodash.uniqWith(images, lodash.isEqual));
-        })
-      : resolve(images);
+    images.push(imageExists(image, rule.nodes));
   });
+
+  const allFoundImages = await Promise.all(images).then((array) =>
+    array.filter((image) => !!image)
+  );
+
+  // Return an array with all duplicates removed.
+  return [
+    ...new Map(
+      allFoundImages.map((obj) => [JSON.stringify(obj), obj])
+    ).values(),
+  ];
 }
 
 exports.collectImages = collectImages;
diff --git a/lib/retina-images.js b/lib/retina-images.js
index 7bad748..a910991 100644
--- a/lib/retina-images.js
+++ b/lib/retina-images.js
@@ -23,9 +23,7 @@ function getRetinaRatio(imageUrl) {
   const matches = retinaPattern.exec(imageUrl.split('#')[0]);
 
   // Convert the string number to an actual integer.
-  const ratio = parseInt(matches[1], 10);
-
-  return ratio;
+  return parseInt(matches[1], 10);
 }
 
 /**
diff --git a/lib/run-spritesmith.js b/lib/run-spritesmith.js
index 0d1c5bd..79ad6d7 100644
--- a/lib/run-spritesmith.js
+++ b/lib/run-spritesmith.js
@@ -1,5 +1,4 @@
 const { promisify } = require('util');
-const lodash = require('lodash');
 const spritesmith = promisify(require('spritesmith').run);
 
 const { areAllRetina, getRetinaPadding } = require('./retina-images');
@@ -34,34 +33,57 @@ function buildSpritesmithConfig(spriteImages, spriteGroup) {
   return config;
 }
 
+/**
+ * Group image objects by their concatenated sprite group names.
+ *
+ * @param {Array} images - Array of image objects.
+ * @returns {object}
+ */
+function groupImagesBySpriteName(images) {
+  const imagesByGroup = {};
+
+  images.reduce((acc, image) => {
+    acc.push(image);
+
+    const key = `${image.groups.join('')}`;
+
+    imagesByGroup[key] = acc.filter(
+      (item) => key === `${item.groups.join('')}`
+    );
+
+    return acc;
+  }, []);
+
+  return imagesByGroup;
+}
+
 /**
  * Run SpriteSmith on the array of images.
  *
  * @param {Array} images - Array of image objects.
  * @returns {Array}
  */
-function runSpritesmith(images) {
-  return new Promise((resolve, reject) => {
-    const allSprites = lodash
-      .chain(images)
-      // Group image objects by their concatenated sprite group names.
-      .groupBy((image) => image.groups.join(''))
-      .map(async (spriteImages, spriteGroup) => {
-        const config = buildSpritesmithConfig(spriteImages, spriteGroup);
-
-        // Calculate the sprite cache hash to use for checking if the sprite
-        // image has already been generated.
-        const cacheHash = cache.createCacheHash(config.src);
-
-        // If a sprite is found in the cache, return it instead of having
-        // spritesmith regenerate a new one.
-        if (cache.isItemCached(cacheHash)) {
-          cache.markAsCached(cacheHash);
-          return cache.getCacheItem(cacheHash);
-        }
+async function runSpritesmith(images) {
+  const groupedImages = groupImagesBySpriteName(images);
+
+  const allNewSprites = Object.entries(groupedImages).map(
+    async ([spriteGroup, spriteImages]) => {
+      const config = buildSpritesmithConfig(spriteImages, spriteGroup);
 
+      // Calculate the sprite cache hash to use for checking if the sprite
+      // image has already been generated.
+      const cacheHash = await cache.createCacheHash(config.src);
+
+      // If a sprite is found in the cache, return it instead of having
+      // spritesmith regenerate a new one.
+      if (cache.isItemCached(cacheHash)) {
+        cache.markAsCached(cacheHash);
+        return cache.getCacheItem(cacheHash);
+      }
+
+      try {
         // Generate the spritesheet with spritesmith.
-        const spritesheet = await spritesmith(config).then((result) => result);
+        const spritesheet = await spritesmith(config);
 
         // Append info about sprite group.
         spritesheet.groups = spriteGroup;
@@ -79,17 +101,13 @@ function runSpritesmith(images) {
         cache.addCacheItem(cacheHash, spritesheet);
 
         return spritesheet;
-      })
-      .value();
-
-    Promise.all(allSprites)
-      .then((results) => {
-        resolve([images, results]);
-      })
-      .catch((err) => reject(err));
-  }).catch((error) => {
-    throw new Error(`Spritesmith failed to generate sprites. ${error}`);
-  });
+      } catch (error) {
+        throw new Error(`Spritesmith failed to generate sprites. ${error}`);
+      }
+    }
+  );
+
+  return Promise.all(allNewSprites);
 }
 
 exports.runSpritesmith = runSpritesmith;
diff --git a/lib/sprite-groups.js b/lib/sprite-groups.js
index cbab603..307ba70 100644
--- a/lib/sprite-groups.js
+++ b/lib/sprite-groups.js
@@ -7,19 +7,13 @@
 function addSpriteGroups(images) {
   const groupedImages = images.map((image) => {
     const { groups, ratio } = image;
-    const spriteGroups = [];
-
-    // Add any existing groups.
-    spriteGroups.push(...groups);
+    const imageWithGroup = image;
 
     // Add any retina groups.
-    if (ratio > 1) {
-      spriteGroups.push(`@${ratio}x`);
-    }
+    const retinaGroup = ratio > 1 ? [`@${ratio}x`] : [];
 
-    const imageWithGroup = image;
     // Add sprite group to image object.
-    imageWithGroup.groups = spriteGroups;
+    imageWithGroup.groups = [...groups, ...retinaGroup];
 
     return imageWithGroup;
   });
diff --git a/lib/sprites.js b/lib/sprites.js
index 77523b0..ebd4b18 100644
--- a/lib/sprites.js
+++ b/lib/sprites.js
@@ -1,13 +1,12 @@
 const { promisify } = require('util');
-const lodash = require('lodash');
 const path = require('path');
 const { writeFile } = require('fs');
 const mkdirp = promisify(require('mkdirp'));
 const ansi = require('ansi-colors');
-const { log } = require('./log');
-const { pluginOptions } = require('./plugin-options');
 
 const writeFileAsync = promisify(writeFile);
+const { log } = require('./log');
+const { pluginOptions } = require('./plugin-options');
 
 /**
  * Map properties for every image.
@@ -18,7 +17,9 @@ const writeFileAsync = promisify(writeFile);
  */
 function mapSpritesProperties(images, sprites) {
   const spriteProperties = sprites.map((sprite) => {
-    return lodash.map(sprite.coordinates, (coordinates, imagePath) => {
+    const imagePaths = Object.keys(sprite.coordinates);
+
+    return imagePaths.map((imagePath) => {
       // Retrieve the existing image object with the same image path.
       const matchingImage = images.find(
         (element) => element.path === imagePath
@@ -27,7 +28,7 @@ function mapSpritesProperties(images, sprites) {
       // Add the sprite information to the image object and return a copy
       // of the object.
       return Object.assign(matchingImage, {
-        coordinates,
+        coordinates: sprite.coordinates[imagePath],
         spritePath: sprite.path,
         properties: sprite.properties,
       });
@@ -43,7 +44,7 @@ function mapSpritesProperties(images, sprites) {
  * @param {object} spriteElement - The sprite element that will be saved.
  * @returns {Promise}
  */
-function saveSpriteFile(spriteElement) {
+async function saveSpriteFile(spriteElement) {
   const opts = pluginOptions.getOptions();
   const sprite = spriteElement;
 
@@ -57,12 +58,11 @@ function saveSpriteFile(spriteElement) {
   }
 
   // Save new version of the sprite image file.
-  return writeFileAsync(sprite.path, Buffer.from(sprite.image, 'binary')).then(
-    () => {
-      log('Easysprites:', ansi.yellow(sprite.path), 'generated.');
-      return sprite;
-    }
-  );
+  await writeFileAsync(sprite.path, Buffer.from(sprite.image, 'binary'));
+
+  log('Easysprites:', ansi.yellow(sprite.path), 'generated.');
+
+  return sprite;
 }
 
 /**
@@ -75,25 +75,23 @@ function saveSpriteFile(spriteElement) {
 async function saveSprites(images, sprites) {
   const opts = pluginOptions.getOptions();
 
-  return mkdirp(opts.spritePath)
-    .then(async () => {
-      const finished = await Promise.all(
-        sprites.map((sprite) => saveSpriteFile(sprite))
-      )
-        .then((allSprites) => {
-          return allSprites;
-        })
-        .catch((error) => {
-          throw new Error(`Sprite file failed to save. ${error}`);
-        });
-
-      return [images, finished];
-    })
-    .catch((error) => {
-      throw new Error(
-        `The directory ${opts.spritePath} could not be created. ${error}`
-      );
-    });
+  try {
+    await mkdirp(opts.spritePath);
+  } catch (error) {
+    throw new Error(
+      `The directory ${opts.spritePath} could not be created. ${error}`
+    );
+  }
+
+  try {
+    const allSavedSprites = await Promise.all(
+      sprites.map((sprite) => saveSpriteFile(sprite))
+    );
+
+    return [images, allSavedSprites];
+  } catch (error) {
+    throw new Error(`Sprite file failed to save. ${error}`);
+  }
 }
 
 exports.mapSpritesProperties = mapSpritesProperties;
diff --git a/lib/tokens.js b/lib/tokens.js
index e437536..130dec2 100644
--- a/lib/tokens.js
+++ b/lib/tokens.js
@@ -96,7 +96,7 @@ function setTokens(images, css) {
     }
 
     // Set the comment information as a token on the image.
-    setCommentToken(image, decl);
+    setCommentToken(image);
 
     // Replace the declaration with a comment token
     // which will be used later for reference.
diff --git a/package-lock.json b/package-lock.json
index b9fe896..444885d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-easysprites",
-  "version": "1.0.0-alpha.2",
+  "version": "1.0.0-beta.1",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -566,9 +566,9 @@
       }
     },
     "@sinonjs/samsam": {
-      "version": "3.3.1",
-      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.1.tgz",
-      "integrity": "sha512-wRSfmyd81swH0hA1bxJZJ57xr22kC07a1N4zuIL47yTS04bDk6AoCkczcqHEjcRPmJ+FruGJ9WBQiJwMtIElFw==",
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/@sinonjs/samsam/-/samsam-3.3.2.tgz",
+      "integrity": "sha512-ILO/rR8LfAb60Y1Yfp9vxfYAASK43NFC2mLzpvLUbCQY/Qu8YwReboseu8aheCEkyElZF2L2T9mHcR2bgdvZyA==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^1.0.2",
@@ -1202,6 +1202,12 @@
       "integrity": "sha512-Un7MIEDdUC5gNpcGDV97op1Ywk748MpHcFTHoYs6qnj1Z3j7I53VG3nwZhKzoBZmbdRNnb6WRdFlwl7tSDuZGw==",
       "dev": true
     },
+    "bluebird": {
+      "version": "3.5.5",
+      "resolved": "https://registry.npmjs.org/bluebird/-/bluebird-3.5.5.tgz",
+      "integrity": "sha512-5am6HnnfN+urzt4yfg7IgTbotDjIT/u8AJpEt0sIU9FtXfVeezXAPKswrG+xKUCOYAINpSdgZVDU6QFh+cuH3w==",
+      "dev": true
+    },
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
@@ -1354,6 +1360,15 @@
       "resolved": "https://registry.npmjs.org/caseless/-/caseless-0.12.0.tgz",
       "integrity": "sha1-G2gcIf+EAzyCZUMJBolCDRhxUdw="
     },
+    "catharsis": {
+      "version": "0.8.11",
+      "resolved": "https://registry.npmjs.org/catharsis/-/catharsis-0.8.11.tgz",
+      "integrity": "sha512-a+xUyMV7hD1BrDQA/3iPV7oc+6W26BgVJO05PGEoatMyIuPScQKsde6i3YorWX1qs+AZjnJ18NqdKoCtKiNh1g==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
+      }
+    },
     "center-align": {
       "version": "0.1.3",
       "resolved": "https://registry.npmjs.org/center-align/-/center-align-0.1.3.tgz",
@@ -1808,22 +1823,22 @@
       }
     },
     "conventional-changelog": {
-      "version": "3.1.8",
-      "resolved": "https://registry.npmjs.org/conventional-changelog/-/conventional-changelog-3.1.8.tgz",
-      "integrity": "sha512-fb3/DOLLrQdNqN0yYn/lT6HcNsAa9A+VTDBqlZBMQcEPPIeJIMI+DBs3yu+eiYOLi22w9oShq3nn/zN6qm1Hmw==",
+      "version": "3.1.10",
+      "resolved": "https://registry.npmjs.org/conventional-changelog/-/conventional-changelog-3.1.10.tgz",
+      "integrity": "sha512-6RDj31hL39HUkpqvPjRlOxAwJRwur8O2qu9m6R0FBNDGwCJyy4SYH9NfyshozxYSeklrauKRf3oSbyoEZVzu9Q==",
       "dev": true,
       "requires": {
         "conventional-changelog-angular": "^5.0.3",
         "conventional-changelog-atom": "^2.0.1",
         "conventional-changelog-codemirror": "^2.0.1",
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+    "requizzle": {
+      "version": "0.2.3",
+      "resolved": "https://registry.npmjs.org/requizzle/-/requizzle-0.2.3.tgz",
+      "integrity": "sha512-YanoyJjykPxGHii0fZP0uUPEXpvqfBDxWV7s6GKAiiOsiqhX6vHNyW3Qzdmqp/iq/ExbhaGbVrjB4ruEVSM4GQ==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.17.14"
+      }
+    },
     "resolve": {
       "version": "1.11.1",
       "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.11.1.tgz",
@@ -9873,17 +10010,17 @@
       "dev": true
     },
     "sinon": {
-      "version": "7.3.2",
-      "resolved": "https://registry.npmjs.org/sinon/-/sinon-7.3.2.tgz",
-      "integrity": "sha512-thErC1z64BeyGiPvF8aoSg0LEnptSaWE7YhdWWbWXgelOyThent7uKOnnEh9zBxDbKixtr5dEko+ws1sZMuFMA==",
+      "version": "7.4.1",
+      "resolved": "https://registry.npmjs.org/sinon/-/sinon-7.4.1.tgz",
+      "integrity": "sha512-7s9buHGHN/jqoy/v4bJgmt0m1XEkCEd/tqdHXumpBp0JSujaT4Ng84JU5wDdK4E85ZMq78NuDe0I3NAqXY8TFg==",
       "dev": true,
       "requires": {
         "@sinonjs/commons": "^1.4.0",
         "@sinonjs/formatio": "^3.2.1",
-        "@sinonjs/samsam": "^3.3.1",
+        "@sinonjs/samsam": "^3.3.2",
         "diff": "^3.5.0",
-        "lolex": "^4.0.1",
-        "nise": "^1.4.10",
+        "lolex": "^4.2.0",
+        "nise": "^1.5.1",
         "supports-color": "^5.5.0"
       }
     },
@@ -10470,6 +10607,12 @@
         }
       }
     },
+    "taffydb": {
+      "version": "2.6.2",
+      "resolved": "https://registry.npmjs.org/taffydb/-/taffydb-2.6.2.tgz",
+      "integrity": "sha1-fLy2S1oUG2ou/CxdLGe04VCyomg=",
+      "dev": true
+    },
     "temp": {
       "version": "0.9.0",
       "resolved": "https://registry.npmjs.org/temp/-/temp-0.9.0.tgz",
@@ -10834,6 +10977,12 @@
       "resolved": "https://registry.npmjs.org/typedarray/-/typedarray-0.0.6.tgz",
       "integrity": "sha1-hnrHTjhkGHsdPUfZlqeOxciDB3c="
     },
+    "uc.micro": {
+      "version": "1.0.6",
+      "resolved": "https://registry.npmjs.org/uc.micro/-/uc.micro-1.0.6.tgz",
+      "integrity": "sha512-8Y75pvTYkLJW2hWQHXxoqRgV7qb9B+9vFEtidML+7koHUFapnVJAZ6cKs+Qjz5Aw3aZWHMC6u0wJE3At+nSGwA==",
+      "dev": true
+    },
     "uglify-js": {
       "version": "2.8.29",
       "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-2.8.29.tgz",
@@ -10856,6 +11005,12 @@
       "integrity": "sha1-5z3T17DXxe2G+6xrCufYxqadUPo=",
       "dev": true
     },
+    "underscore": {
+      "version": "1.9.1",
+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.9.1.tgz",
+      "integrity": "sha512-5/4etnCkd9c8gwgowi5/om/mYO5ajCaOgdzj/oW+0eQV9WxKBDZw5+ycmKmeaTXjInS/W0BzpGLo2xR2aBwZdg==",
+      "dev": true
+    },
     "undertaker": {
       "version": "1.2.1",
       "resolved": "https://registry.npmjs.org/undertaker/-/undertaker-1.2.1.tgz",
@@ -11315,6 +11470,12 @@
         "signal-exit": "^3.0.2"
       }
     },
+    "xmlcreate": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/xmlcreate/-/xmlcreate-2.0.1.tgz",
+      "integrity": "sha512-MjGsXhKG8YjTKrDCXseFo3ClbMGvUD4en29H2Cev1dv4P/chlpw6KdYmlCWDkhosBVKRDjM836+3e3pm1cBNJA==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.1",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
diff --git a/package.json b/package.json
index 37d1876..8a39698 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-easysprites",
-  "version": "1.0.0-alpha.3",
+  "version": "1.0.0-beta.1",
   "description": "PostCSS plugin that generate sprites, like postcss-sprites, but proper way",
   "keywords": [
     "postcss",
@@ -33,7 +33,6 @@
     "ansi-colors": "^4.1.1",
     "css-color-names": "^1.0.1",
     "fancy-log": "^1.3.3",
-    "lodash": "^4.17.15",
     "md5": "^2.2.1",
     "mkdirp": "^0.5.1",
     "postcss": "^7.0.17",
@@ -45,7 +44,7 @@
     "chai": "^4.0.0",
     "chai-as-promised": "^7.1.1",
     "commitizen": "^3.1.2",
-    "conventional-changelog-cli": "^2.0.21",
+    "conventional-changelog-cli": "^2.0.23",
     "cz-customizable": "^6.2.0",
     "del": "^5.0.0",
     "eslint": "^5.16.0",
@@ -54,6 +53,8 @@
     "eslint-plugin-import": "^2.18.2",
     "eslint-plugin-jsdoc": "^8.7.0",
     "eslint-plugin-prettier": "^3.1.0",
+    "eslint-plugin-promise": "^4.2.1",
+    "eslint-plugin-sonarjs": "^0.4.0",
     "eslint-watch": "^5.1.2",
     "fixture-stdout": "^0.2.1",
     "gulp": "^4.0.2",
@@ -61,7 +62,8 @@
     "gulp-mocha": "^6.0.0",
     "gulp-postcss": "^8.0.0",
     "gulp-rename": "^1.4.0",
-    "husky": "^3.0.1",
+    "husky": "^3.0.3",
+    "jsdoc": "^3.6.3",
     "mocha": "^6.2.0",
     "mocha-performance": "^0.1.1",
     "nyc": "^14.1.1",
@@ -70,7 +72,7 @@
     "prettier": "^1.18.2",
     "rewire": "^4.0.1",
     "rimraf": "^2.6.3",
-    "sinon": "^7.3.2"
+    "sinon": "^7.4.1"
   },
   "scripts": {
     "test": "gulp test",
@@ -83,7 +85,8 @@
     "mocha": "mocha",
     "perf": "node --prof ./node_modules/mocha/bin/_mocha",
     "performance": "node --allow-natives-syntax ./node_modules/mocha/bin/_mocha --reporter mocha-performance ./test/**/*.js",
-    "coverage": "nyc --reporter=text-summary --reporter=html --reporter=text --reporter=lcov mocha --recursive --timeout 5000"
+    "coverage": "nyc --reporter=text-summary --reporter=html --reporter=text --reporter=lcov mocha --recursive --timeout 5000",
+    "docs": "jsdoc -c jsdoc.conf.json"
   },
   "config": {
     "commitizen": {
diff --git a/test/basic.test.js b/test/basic.test.js
index dbde665..52880ef 100644
--- a/test/basic.test.js
+++ b/test/basic.test.js
@@ -90,8 +90,8 @@ describe('Basic', function() {
     testOptions.padding = 100;
 
     assertEqual(
-      'a { background-image: url("images/arrow-next.png#elements"); }',
-      'a { background-image: url(sprites/elements.png); background-position: 0 0; }',
+      'a { background-image: url("images/arrow-next.png#elements"); outline: none; }',
+      'a { background-image: url(sprites/elements.png); background-position: 0 0; outline: none; }',
       testOptions,
       done
     );
diff --git a/test/caching.test.js b/test/caching.test.js
index 8954a66..9bbd03a 100644
--- a/test/caching.test.js
+++ b/test/caching.test.js
@@ -35,55 +35,58 @@ function uncacheLog() {
   return logCapture.toString();
 }
 
-const assertNotCached = (input, output, opts, done) => {
+const assertNotCached = async (input, output, opts, done) => {
   // Start stdout log capture.
   cacheLog();
 
-  postcss([plugin(opts)])
-    .process(input, { from: undefined })
-    .then((result) => {
-      expect(result.css).to.eql(output);
-      // eslint-disable-next-line
-      expect(result.warnings()).to.be.empty;
+  try {
+    const result = await postcss([plugin(opts)]).process(input, {
+      from: undefined,
+    });
 
-      // Stop stdout capture.
-      fixture.release();
+    expect(result.css).to.eql(output);
 
-      if (uncacheLog().indexOf('generated') === -1) {
-        return done(new Error('Sprite already cached, code red!'));
-      }
+    // eslint-disable-next-line
+    expect(result.warnings()).to.be.empty;
 
-      return done();
-    })
-    .catch((error) => {
-      done(error);
-    });
+    // Stop stdout capture.
+    fixture.release();
+
+    if (uncacheLog().indexOf('generated') === -1) {
+      return done(new Error('Sprite already cached, code red!'));
+    }
+  } catch (error) {
+    done(error);
+  }
+
+  return done();
 };
 
-const assertCached = (input, output, opts, done) => {
+const assertCached = async (input, output, opts, done) => {
   // Start stdout log capture.
   cacheLog();
 
-  postcss([plugin(opts)])
-    .process(input, { from: undefined })
-    .then((result) => {
-      expect(result.css).to.eql(output);
+  try {
+    const result = await postcss([plugin(opts)]).process(input, {
+      from: undefined,
+    });
 
-      // eslint-disable-next-line
-      expect(result.warnings()).to.be.empty;
+    expect(result.css).to.eql(output);
 
-      // Stop stdout capture.
-      fixture.release();
+    // eslint-disable-next-line
+    expect(result.warnings()).to.be.empty;
 
-      if (uncacheLog().indexOf('unchanged') === -1) {
-        return done(new Error('Cache is not working'));
-      }
+    // Stop stdout capture.
+    fixture.release();
 
-      return done();
-    })
-    .catch((error) => {
-      done(error);
-    });
+    if (uncacheLog().indexOf('unchanged') === -1) {
+      return done(new Error('Cache is not working'));
+    }
+  } catch (error) {
+    done(error);
+  }
+
+  return done();
 };
 
 /* eslint-disable func-names */
diff --git a/test/collect-images.test.js b/test/collect-images.test.js
index b824f95..59209be 100644
--- a/test/collect-images.test.js
+++ b/test/collect-images.test.js
@@ -1,6 +1,8 @@
 const rewire = require('rewire');
 const { expect } = require('chai');
+const util = require('util');
 
+const setTimeoutPromise = util.promisify(setTimeout);
 const collectImagesModule = rewire('../lib/collect-images');
 
 /* eslint-disable func-names */
@@ -10,8 +12,12 @@ describe('Image Exists', function() {
       path: undefined,
     };
 
-    const fileExistsAsync = () => {
-      return Promise.reject(new Error('fileExistsAsync failed'));
+    const fileExistsAsync = async () => {
+      await setTimeoutPromise(1000, 'fileExistsAsync failed').then(
+        (message) => {
+          throw new Error(message);
+        }
+      );
     };
 
     /* eslint-disable no-underscore-dangle */
diff --git a/test/demo/index.html b/test/demo/index.html
index 49f6fd6..705659a 100644
--- a/test/demo/index.html
+++ b/test/demo/index.html
@@ -1,2 +1,5 @@
 <link href="output.css" media="all" rel="stylesheet" />
-<div class="arrow"></div>
+<div class="grid">
+<a href="#" class="arrow arrow--previous"></a>
+<a href="#" class="arrow arrow--next"></a>
+</div>
diff --git a/test/fixtures/input.css b/test/fixtures/input.css
index 4bbfc2e..4481d91 100644
--- a/test/fixtures/input.css
+++ b/test/fixtures/input.css
@@ -1,33 +1,67 @@
+.grid {
+  display: flex;
+  justify-content: space-around;
+}
+
 .arrow {
   width: 28px;
   height: 27px;
   margin: 10px auto;
+  display: block;
 }
 
-.arrow {
+.arrow--previous {
+  background-image: url('images/arrow-previous.png#elements');
+}
+
+.arrow--previous:hover {
+  background-image: url('images/arrow-previous--hover.png#elements');
+}
+
+@media only screen and (min-resolution: 1.5dppx) {
+  .arrow--previous {
+    background-image: url('images/arrow-previous@2x.png#elements');
+  }
+
+  .arrow--previous:hover {
+    background-image: url('images/arrow-previous--hover@2x.png#elements');
+  }
+}
+
+@media only screen and (min-resolution: 2.5dppx) {
+  .arrow--previous {
+    background-image: url('images/arrow-previous@3x.png#elements');
+  }
+
+  .arrow--previous:hover {
+    background-image: url('images/arrow-previous--hover@3x.png#elements');
+  }
+}
+
+.arrow--next {
   background-image: url('images/arrow-next.png#elements');
 }
 
-.arrow:hover {
+.arrow--next:hover {
   background-image: url('images/arrow-next--hover.png#elements');
 }
 
 @media only screen and (min-resolution: 1.5dppx) {
-  .arrow {
+  .arrow--next {
     background-image: url('images/arrow-next@2x.png#elements');
   }
 
-  .arrow:hover {
+  .arrow--next:hover {
     background-image: url('images/arrow-next--hover@2x.png#elements');
   }
 }
 
 @media only screen and (min-resolution: 2.5dppx) {
-  .arrow {
+  .arrow--next {
     background-image: url('images/arrow-next@3x.png#elements');
   }
 
-  .arrow:hover {
+  .arrow--next:hover {
     background-image: url('images/arrow-next--hover@3x.png#elements');
   }
 }
diff --git a/test/fixtures/reference-sprites/elements.png b/test/fixtures/reference-sprites/elements.png
index 21e6420..805e3b5 100644
Binary files a/test/fixtures/reference-sprites/elements.png and b/test/fixtures/reference-sprites/elements.png differ
diff --git a/test/fixtures/reference-sprites/elements@2x.png b/test/fixtures/reference-sprites/elements@2x.png
index 20c8e97..3523a85 100644
Binary files a/test/fixtures/reference-sprites/elements@2x.png and b/test/fixtures/reference-sprites/elements@2x.png differ
diff --git a/test/fixtures/reference-sprites/elements@3x.png b/test/fixtures/reference-sprites/elements@3x.png
index 9b37fd4..709a848 100644
Binary files a/test/fixtures/reference-sprites/elements@3x.png and b/test/fixtures/reference-sprites/elements@3x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/alt-diagonal/elements.png b/test/fixtures/reference-sprites/layouts/alt-diagonal/elements.png
index 7126ea6..07b433b 100644
Binary files a/test/fixtures/reference-sprites/layouts/alt-diagonal/elements.png and b/test/fixtures/reference-sprites/layouts/alt-diagonal/elements.png differ
diff --git a/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@2x.png b/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@2x.png
index dd31c86..a62e053 100644
Binary files a/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@2x.png and b/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@2x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@3x.png b/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@3x.png
index ee08b68..d4f9ae6 100644
Binary files a/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@3x.png and b/test/fixtures/reference-sprites/layouts/alt-diagonal/elements@3x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/binary-tree/elements.png b/test/fixtures/reference-sprites/layouts/binary-tree/elements.png
index 21e6420..805e3b5 100644
Binary files a/test/fixtures/reference-sprites/layouts/binary-tree/elements.png and b/test/fixtures/reference-sprites/layouts/binary-tree/elements.png differ
diff --git a/test/fixtures/reference-sprites/layouts/binary-tree/elements@2x.png b/test/fixtures/reference-sprites/layouts/binary-tree/elements@2x.png
index 20c8e97..3523a85 100644
Binary files a/test/fixtures/reference-sprites/layouts/binary-tree/elements@2x.png and b/test/fixtures/reference-sprites/layouts/binary-tree/elements@2x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/binary-tree/elements@3x.png b/test/fixtures/reference-sprites/layouts/binary-tree/elements@3x.png
index 9b37fd4..709a848 100644
Binary files a/test/fixtures/reference-sprites/layouts/binary-tree/elements@3x.png and b/test/fixtures/reference-sprites/layouts/binary-tree/elements@3x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/diagonal/elements.png b/test/fixtures/reference-sprites/layouts/diagonal/elements.png
index 0e2b4cf..921a143 100644
Binary files a/test/fixtures/reference-sprites/layouts/diagonal/elements.png and b/test/fixtures/reference-sprites/layouts/diagonal/elements.png differ
diff --git a/test/fixtures/reference-sprites/layouts/diagonal/elements@2x.png b/test/fixtures/reference-sprites/layouts/diagonal/elements@2x.png
index 26bf2f3..831afa6 100644
Binary files a/test/fixtures/reference-sprites/layouts/diagonal/elements@2x.png and b/test/fixtures/reference-sprites/layouts/diagonal/elements@2x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/diagonal/elements@3x.png b/test/fixtures/reference-sprites/layouts/diagonal/elements@3x.png
index fb6985d..0b8eee0 100644
Binary files a/test/fixtures/reference-sprites/layouts/diagonal/elements@3x.png and b/test/fixtures/reference-sprites/layouts/diagonal/elements@3x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/left-right/elements.png b/test/fixtures/reference-sprites/layouts/left-right/elements.png
index 21e6420..6286e59 100644
Binary files a/test/fixtures/reference-sprites/layouts/left-right/elements.png and b/test/fixtures/reference-sprites/layouts/left-right/elements.png differ
diff --git a/test/fixtures/reference-sprites/layouts/left-right/elements@2x.png b/test/fixtures/reference-sprites/layouts/left-right/elements@2x.png
index 20c8e97..ceb4b6b 100644
Binary files a/test/fixtures/reference-sprites/layouts/left-right/elements@2x.png and b/test/fixtures/reference-sprites/layouts/left-right/elements@2x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/left-right/elements@3x.png b/test/fixtures/reference-sprites/layouts/left-right/elements@3x.png
index 9b37fd4..350ce88 100644
Binary files a/test/fixtures/reference-sprites/layouts/left-right/elements@3x.png and b/test/fixtures/reference-sprites/layouts/left-right/elements@3x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/top-down/elements.png b/test/fixtures/reference-sprites/layouts/top-down/elements.png
index 1f3f83e..465175d 100644
Binary files a/test/fixtures/reference-sprites/layouts/top-down/elements.png and b/test/fixtures/reference-sprites/layouts/top-down/elements.png differ
diff --git a/test/fixtures/reference-sprites/layouts/top-down/elements@2x.png b/test/fixtures/reference-sprites/layouts/top-down/elements@2x.png
index 9cb23ee..10563fd 100644
Binary files a/test/fixtures/reference-sprites/layouts/top-down/elements@2x.png and b/test/fixtures/reference-sprites/layouts/top-down/elements@2x.png differ
diff --git a/test/fixtures/reference-sprites/layouts/top-down/elements@3x.png b/test/fixtures/reference-sprites/layouts/top-down/elements@3x.png
index 248a7bb..96cff04 100644
Binary files a/test/fixtures/reference-sprites/layouts/top-down/elements@3x.png and b/test/fixtures/reference-sprites/layouts/top-down/elements@3x.png differ
diff --git a/test/index.test.js b/test/index.test.js
index 5d785f6..e23be99 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -21,15 +21,14 @@ describe('Plugin processes', function() {
     /* eslint-disable no-underscore-dangle */
     plugin.__set__('updateReferences', updateReferences);
 
-    const run = () => {
-      return postcss([plugin(opts)])
-        .process('', {
+    const run = async () => {
+      try {
+        return await postcss([plugin(opts)]).process('', {
           from: undefined,
-        })
-        .then(() => {})
-        .catch((err) => {
-          return Promise.reject(err);
         });
+      } catch (error) {
+        return Promise.reject(error);
+      }
     };
 
     expect(run())
diff --git a/test/sprites.test.js b/test/sprites.test.js
index a3d66ff..75af6cb 100644
--- a/test/sprites.test.js
+++ b/test/sprites.test.js
@@ -55,4 +55,42 @@ describe('Build sprites', function() {
 
     done();
   });
+
+  it('should throw exception if directory cannot be created', function(done) {
+    const testImages = [
+      {
+        path: '',
+        url: 'images/arrow-next.png#elements',
+        stylesheetPath: './test/fixtures',
+        ratio: 1,
+        groups: ['elements'],
+        token: {},
+        hash: 'elements',
+      },
+    ];
+
+    const testSprites = [
+      {
+        coordinates: {
+          '': {},
+        },
+        properties: { width: 28, height: 27 },
+        image: '',
+        groups: ['elements'],
+        path: '',
+        isFromCache: false,
+      },
+    ];
+
+    const mkdirp = () => {
+      return Promise.reject(new Error());
+    };
+
+    /* eslint-disable no-underscore-dangle */
+    sprites.__set__('mkdirp', mkdirp);
+
+    expect(sprites.saveSprites(testImages, testSprites))
+      .to.eventually.be.rejectedWith('could not be created')
+      .notify(done);
+  });
 });
diff --git a/test/test-utils.js b/test/test-utils.js
index 7f21c23..53fe0cd 100644
--- a/test/test-utils.js
+++ b/test/test-utils.js
@@ -16,19 +16,21 @@ const getTestOptions = () => {
   );
 };
 
-const assertEqual = (input, output, opts, done) => {
-  postcss([plugin(opts)])
-    .process(input, { from: undefined })
-    .then((result) => {
-      expect(result.css).to.eql(output);
-
-      // eslint-disable-next-line
-      expect(result.warnings()).to.be.empty;
-      done();
-    })
-    .catch((error) => {
-      done(error);
+const assertEqual = async (input, output, opts, done) => {
+  try {
+    const result = await postcss([plugin(opts)]).process(input, {
+      from: undefined,
     });
+
+    expect(result.css).to.eql(output);
+
+    // eslint-disable-next-line
+    expect(result.warnings()).to.be.empty;
+
+    done();
+  } catch (error) {
+    done(error);
+  }
 };
 
 /**
@@ -53,53 +55,57 @@ const getSpriteFilenames = (directory) => {
 const assertVisuallyEqual = (testDir, referenceDir, opts, done) => {
   const options = opts || getTestOptions();
 
-  fs.readFile(
-    path.resolve(__dirname, 'fixtures/input.css'),
-    'utf8',
-    (err, css) => {
-      postcss([plugin(options)])
-        .process(css, {
-          from: undefined,
-        })
-        .then(() => {
-          const threshold = 0.1;
+  /**
+   * Visual regression test.
+   *
+   * @param {object} err - Error callback.
+   * @param {object} css - CSS file object.
+   *
+   * @returns {Function}
+   */
+  async function visualTest(err, css) {
+    try {
+      await postcss([plugin(options)]).process(css, {
+        from: undefined,
+      });
 
-          getSpriteFilenames(testDir)
-            .then((values) => {
-              values.forEach((fileName) => {
-                const testImage = PNG.sync.read(
-                  fs.readFileSync(`${testDir}/${fileName}`)
-                );
-                const referenceImage = PNG.sync.read(
-                  fs.readFileSync(`${referenceDir}/${fileName}`)
-                );
+      const threshold = 0.1;
 
-                const { width, height } = referenceImage;
+      const values = await getSpriteFilenames(testDir);
 
-                const imageDiff = pixelmatch(
-                  testImage.data,
-                  referenceImage.data,
-                  null,
-                  width,
-                  height,
-                  {
-                    threshold,
-                  }
-                );
+      values.forEach((fileName) => {
+        const testImage = PNG.sync.read(
+          fs.readFileSync(`${testDir}/${fileName}`)
+        );
+        const referenceImage = PNG.sync.read(
+          fs.readFileSync(`${referenceDir}/${fileName}`)
+        );
+        const { width, height } = referenceImage;
+        const imageDiff = pixelmatch(
+          testImage.data,
+          referenceImage.data,
+          null,
+          width,
+          height,
+          {
+            threshold,
+          }
+        );
 
-                expect(imageDiff).to.be.below(threshold);
-              });
+        expect(imageDiff).to.be.below(threshold);
+      });
 
-              done();
-            })
-            .catch((error) => {
-              done(error);
-            });
-        })
-        .catch((error) => {
-          done(error);
-        });
+      done();
+    } catch (error) {
+      done(error);
     }
+  }
+
+  fs.readFile(
+    path.resolve(__dirname, 'fixtures/input.css'),
+    'utf8',
+    // eslint-disable-next-line
+    (err, css) => visualTest(err, css)
   );
 };