diff --git a/lib/tests/run_tests.js b/lib/tests/run_tests.js
index 0ed32c7c6..ef9f7b0c1 100644
--- a/lib/tests/run_tests.js
+++ b/lib/tests/run_tests.js
@@ -30,6 +30,23 @@ module.exports = {
     }
 
     async.waterfall([
+      function getFiles(next) {
+        if (filePath.substr(-1) !== '/') {
+          return fs.access(filePath, (err) => {
+            if (err) {
+              return next(`File "${filePath}" doesn't exist or you don't have permission to it`.red);
+            }
+            next(null, [filePath]);
+          });
+        }
+        getFilesFromDir(filePath, (err, files) => {
+          if (err) {
+            console.error('Error while reading the directory');
+            return next(err);
+          }
+          next(null, files);
+        });
+      },
       function setupGlobalNamespace(next) {
         // TODO put default config
         const test = new Test();
@@ -63,18 +80,6 @@ module.exports = {
         console.info('Compiling contracts'.cyan);
         test.init(next);
       },
-      function getFiles(next) {
-        if (filePath.substr(-1) !== '/') {
-          return next(null, [filePath]);
-        }
-        getFilesFromDir(filePath, (err, files) => {
-          if (err) {
-            console.error('Error while reading the directory');
-            return next(err);
-          }
-          next(null, files);
-        });
-      },
       function executeForAllFiles(files, next) {
         async.eachLimit(files, 1, (file, eachCb) => {
           const mocha = new Mocha();
diff --git a/package-lock.json b/package-lock.json
index 8ba864c58..303c67f25 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -92,7 +92,7 @@
     "abbrev": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
-      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
+      "integrity": "sha1-+PLIh60Qv2f2NPAFtph/7TF5qsg="
     },
     "abstract-leveldown": {
       "version": "2.6.3",
@@ -114,7 +114,7 @@
     "acorn": {
       "version": "5.5.3",
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.5.3.tgz",
-      "integrity": "sha512-jd5MkIUlbbmb07nXH0DT3y7rDVtkzDi4XZOUVWAer8ajmF/DTSSbl5oNFyDOl/OXA33Bl79+ypHhl2pN20VeOQ=="
+      "integrity": "sha1-9HPdR+AnegjijpvsWu6wR1HwuMk="
     },
     "acorn-dynamic-import": {
       "version": "2.0.2",
@@ -484,7 +484,7 @@
     "argparse": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
-      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "integrity": "sha1-vNZ5HqWuCXJeF+WtmIE0zUCz2RE=",
       "requires": {
         "sprintf-js": "1.0.3"
       }
@@ -500,7 +500,7 @@
     "arr-flatten": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.1.0.tgz",
-      "integrity": "sha512-L3hKV5R/p5o81R7O02IGnwpDmkp6E982XhtbuwSe3O4qOtMMMtodicASA1Cny2U+aCXcNpml+m4dPsvsJ3jatg=="
+      "integrity": "sha1-NgSLv/TntH4TZkQxbJlmnqWukfE="
     },
     "arr-union": {
       "version": "3.1.0",
@@ -559,7 +559,7 @@
     "asn1.js": {
       "version": "4.10.1",
       "resolved": "https://registry.npmjs.org/asn1.js/-/asn1.js-4.10.1.tgz",
-      "integrity": "sha512-p32cOF5q0Zqs9uBiONKYLm6BClCoBCM5O9JfeUSlnQLBTxYdTK+pW+nXflm8UkKd2UYlEbYz5qEi0JuZR9ckSw==",
+      "integrity": "sha1-ucK/WAXx5kqt7tbfOiv6+1pz9aA=",
       "requires": {
         "bn.js": "4.11.8",
         "inherits": "2.0.3",
@@ -687,7 +687,7 @@
     "babel-generator": {
       "version": "6.26.1",
       "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.1.tgz",
-      "integrity": "sha512-HyfwY6ApZj7BYTcJURpM5tznulaBvyio7/0d4zFOeMPUmfxkCjHocCuoLa2SAGzBI8AREcH3eP3758F672DppA==",
+      "integrity": "sha1-GERAjTuPDTWkBOp6wYDwh6YBvZA=",
       "requires": {
         "babel-messages": "6.23.0",
         "babel-runtime": "6.26.0",
@@ -858,7 +858,7 @@
     "babel-loader": {
       "version": "7.1.4",
       "resolved": "https://registry.npmjs.org/babel-loader/-/babel-loader-7.1.4.tgz",
-      "integrity": "sha512-/hbyEvPzBJuGpk9o80R0ZyTej6heEOr59GoEUtn8qFKbnx4cJm9FWES6J/iv644sYgrtVw9JJQkjaLW/bqb5gw==",
+      "integrity": "sha1-40Y5OL1ObVXRwXTFSF1AahiO0BU=",
       "requires": {
         "find-cache-dir": "1.0.0",
         "loader-utils": "1.1.0",
@@ -1553,7 +1553,7 @@
     "babylon": {
       "version": "6.18.0",
       "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
-      "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ=="
+      "integrity": "sha1-ry87iPpvXB5MY00aD46sT1WzleM="
     },
     "backoff": {
       "version": "2.5.0",
@@ -1571,7 +1571,7 @@
     "base": {
       "version": "0.11.2",
       "resolved": "https://registry.npmjs.org/base/-/base-0.11.2.tgz",
-      "integrity": "sha512-5T6P4xPgpp0YDFvSWwEZ4NoE3aM4QBQXDzmVbraCkFj8zHM+mba8SyqB5DbZWyR7mYHo6Y7BdQo3MoA4m0TeQg==",
+      "integrity": "sha1-e95c7RRbbVUakNuH+DxVi060io8=",
       "requires": {
         "cache-base": "1.0.1",
         "class-utils": "0.3.6",
@@ -1630,7 +1630,7 @@
     "big.js": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/big.js/-/big.js-3.2.0.tgz",
-      "integrity": "sha512-+hN/Zh2D08Mx65pZ/4g5bsmNiZUuChDiQfTUQ7qJr4/kuopCr88xZsAXv6mBoZEsUI4OuGHlX59qE94K2mMW8Q=="
+      "integrity": "sha1-pfwpi4G54Nyi5FiCR4S2XFK6WI4="
     },
     "binary-extensions": {
       "version": "1.11.0",
@@ -1645,7 +1645,7 @@
     "bindings": {
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.3.0.tgz",
-      "integrity": "sha512-DpLh5EzMR2kzvX1KIlVC0VkC3iZtHKTgdtZ0a3pglBZdaQFjt5S9g9xd1lE+YvXyfd6mtCeRnrUfOLYiTMlNSw=="
+      "integrity": "sha1-s0b27PapX1qBXFg5/HzbIlAvHtc="
     },
     "bip39": {
       "version": "2.5.0",
@@ -1701,7 +1701,7 @@
     "bn.js": {
       "version": "4.11.8",
       "resolved": "https://registry.npmjs.org/bn.js/-/bn.js-4.11.8.tgz",
-      "integrity": "sha512-ItfYfPLkWHUjckQCk8xC+LwxgK8NYcXywGigJgSwOP8Y2iyWT4f2vsZnoOXTTbo+o5yXmIUJ4gn5538SO5S3gA=="
+      "integrity": "sha1-LN4J617jQfSEdGuwMJsyU7GxRC8="
     },
     "body-parser": {
       "version": "1.18.2",
@@ -1731,7 +1731,7 @@
     "brace-expansion": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
-      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "integrity": "sha1-PH/L9SnYcibz0vUrlm/1Jx60Qd0=",
       "requires": {
         "balanced-match": "1.0.0",
         "concat-map": "0.0.1"
@@ -1936,7 +1936,7 @@
     "cache-base": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/cache-base/-/cache-base-1.0.1.tgz",
-      "integrity": "sha512-AKcdTnFSWATd5/GCPRxr2ChwIJ85CeyrEyjRHlKxQ56d4XJMGym0uAiKn0xbLOGOl3+yRpOTi484dVCEc5AUzQ==",
+      "integrity": "sha1-Cn9GQWgxyLZi7jb+TnxZ129marI=",
       "requires": {
         "collection-visit": "1.0.0",
         "component-emitter": "1.2.1",
@@ -2228,7 +2228,7 @@
     "cids": {
       "version": "0.5.3",
       "resolved": "https://registry.npmjs.org/cids/-/cids-0.5.3.tgz",
-      "integrity": "sha512-ujWbNP8SeLKg5KmGrxYZM4c+ttd+wwvegrdtgmbi2KNFUbQN4pqsGZaGQE3rhjayXTbKFq36bYDbKhsnD0eMsg==",
+      "integrity": "sha1-miW2l+t2+vgHr87DXEq5Nu370KQ=",
       "requires": {
         "multibase": "0.4.0",
         "multicodec": "0.2.6",
@@ -2238,7 +2238,7 @@
     "cipher-base": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/cipher-base/-/cipher-base-1.0.4.tgz",
-      "integrity": "sha512-Kkht5ye6ZGmwv40uUDZztayT2ThLQGfnj/T71N/XzeZeo3nf8foyW7zGTsPYkEya3m5f3cAypH+qe7YOrM1U2Q==",
+      "integrity": "sha1-h2Dk7MJy9MNjUy+SbYdKriwTl94=",
       "requires": {
         "inherits": "2.0.3",
         "safe-buffer": "5.1.1"
@@ -2253,7 +2253,7 @@
     "clap": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/clap/-/clap-1.2.3.tgz",
-      "integrity": "sha512-4CoL/A3hf90V3VIEjeuhSvlGFEHKzOz+Wfc2IVZc+FaUgU0ZQafJTP49fvnULipOPcAfqhyI2duwQyns6xqjYA==",
+      "integrity": "sha1-TzZ0WzIAhJJVf0ZBLWbVDLmbzlE=",
       "requires": {
         "chalk": "1.1.3"
       }
@@ -2261,7 +2261,7 @@
     "class-utils": {
       "version": "0.3.6",
       "resolved": "https://registry.npmjs.org/class-utils/-/class-utils-0.3.6.tgz",
-      "integrity": "sha512-qOhPa/Fj7s6TY8H8esGu5QNpMMQxz79h+urzrNYN6mn+9BnxlDGf5QZ+XeCDsxSjPqsSR56XOZOJmpeurnLMeg==",
+      "integrity": "sha1-+TNprouafOAv1B+q0MqDAzGQxGM=",
       "requires": {
         "arr-union": "3.1.0",
         "define-property": "0.2.5",
@@ -2515,7 +2515,7 @@
     "color-convert": {
       "version": "1.9.1",
       "resolved": "https://registry.npmjs.org/color-convert/-/color-convert-1.9.1.tgz",
-      "integrity": "sha512-mjGanIiwQJskCC18rPR6OmrZ6fm2Lc7PeGFYwCmy5J34wC6F1PzdGL6xeMfmgicfYcNLGuVFA3WzXtIDCQSZxQ==",
+      "integrity": "sha1-wSYRB66y8pTr/+ye2eytUppgl+0=",
       "requires": {
         "color-name": "1.1.3"
       }
@@ -2726,7 +2726,7 @@
     "crypto-browserify": {
       "version": "3.12.0",
       "resolved": "https://registry.npmjs.org/crypto-browserify/-/crypto-browserify-3.12.0.tgz",
-      "integrity": "sha512-fz4spIh+znjO2VjL+IdhEpRJ3YN6sMzITSBijk6FK2UvTqruSQW+/cCZTSNsMiZNvUeq0CqurF+dAbyiGOY6Wg==",
+      "integrity": "sha1-OWz58xN/A+S45TLFj2mCVOAPgOw=",
       "requires": {
         "browserify-cipher": "1.0.0",
         "browserify-sign": "4.0.4",
@@ -2905,7 +2905,7 @@
     "debug": {
       "version": "2.6.9",
       "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
-      "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+      "integrity": "sha1-XRKFFd8TT/Mn6QpMk/Tgd6U2NB8=",
       "requires": {
         "ms": "2.0.0"
       }
@@ -3057,7 +3057,7 @@
     "define-property": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/define-property/-/define-property-2.0.2.tgz",
-      "integrity": "sha512-jwK2UV4cnPpbcG7+VRARKTZPUWowwXA8bzH5NP6ud0oeAxyYPuGZUAC7hMugpCdz4BeSZl2Dl9k66CHJ/46ZYQ==",
+      "integrity": "sha1-1Flono1lS6d+AqgX+HENcCyxbp0=",
       "requires": {
         "is-descriptor": "1.0.2",
         "isobject": "3.0.1"
@@ -3303,7 +3303,7 @@
     "end-of-stream": {
       "version": "1.4.1",
       "resolved": "https://registry.npmjs.org/end-of-stream/-/end-of-stream-1.4.1.tgz",
-      "integrity": "sha512-1MkrZNvWTKCaigbn+W15elq2BB/L22nqrSY5DKlo3X6+vclJm8Bb5djXJBmEX6fS3+zCh/F4VBK5Z2KxJt4s2Q==",
+      "integrity": "sha1-7SljTRm6ukY7bOa4CjchPqtx7EM=",
       "requires": {
         "once": "1.4.0"
       }
@@ -3634,7 +3634,7 @@
     "esrecurse": {
       "version": "4.2.1",
       "resolved": "https://registry.npmjs.org/esrecurse/-/esrecurse-4.2.1.tgz",
-      "integrity": "sha512-64RBB++fIOAXPw3P9cy89qfMlvZEXZkqqJkjqqXIvzP5ezRZjW+lPWjw35UX/3EhUPFYbg5ER4JYgDw4007/DQ==",
+      "integrity": "sha1-AHo7n9vCs7uH5IeeoZyS/b05Qs8=",
       "requires": {
         "estraverse": "4.2.0"
       }
@@ -4141,7 +4141,7 @@
     "evp_bytestokey": {
       "version": "1.0.3",
       "resolved": "https://registry.npmjs.org/evp_bytestokey/-/evp_bytestokey-1.0.3.tgz",
-      "integrity": "sha512-/f2Go4TognH/KvCISP7OUsHn85hT9nUkxxA9BEWxFn+Oj9o8ZNLm/40hdlgSLyuOimsrTKLUMEorQexp/aPQeA==",
+      "integrity": "sha1-f8vbGY3HGVlDLv4ThCaE4FJaywI=",
       "requires": {
         "md5.js": "1.3.4",
         "safe-buffer": "5.1.1"
@@ -4262,7 +4262,7 @@
         "is-extendable": {
           "version": "1.0.1",
           "resolved": "https://registry.npmjs.org/is-extendable/-/is-extendable-1.0.1.tgz",
-          "integrity": "sha512-arnXMxT1hhoKo9k1LZdmlNyJdDDfy2v0fXjFlmok4+i8ul/6WlbVge9bhM74OpNPQPMGUToDtz+KXa1PneJxOA==",
+          "integrity": "sha1-p0cPnkJnM9gb2B4RVSZOOjUHyrQ=",
           "requires": {
             "is-plain-object": "2.0.4"
           }
@@ -4668,7 +4668,7 @@
     "file-loader": {
       "version": "1.1.11",
       "resolved": "https://registry.npmjs.org/file-loader/-/file-loader-1.1.11.tgz",
-      "integrity": "sha512-TGR4HU7HUsGg6GCOPJnFk06RhWgEWFLAGWiT6rcD+GRC2keU3s9RGJ+b3Z6/U73jwwNb2gKLJ7YCrp+jvU4ALg==",
+      "integrity": "sha1-b+iGRJsPKpNuQ8q6rAzb+zaVBvg=",
       "requires": {
         "loader-utils": "1.1.0",
         "schema-utils": "0.4.5"
@@ -4937,7 +4937,7 @@
     "function-bind": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
-      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A=="
+      "integrity": "sha1-pWiZ0+o8m6uHS7l3O3xe3pL0iV0="
     },
     "functional-red-black-tree": {
       "version": "1.0.1",
@@ -5053,7 +5053,7 @@
     "glob": {
       "version": "7.1.2",
       "resolved": "https://registry.npmjs.org/glob/-/glob-7.1.2.tgz",
-      "integrity": "sha512-MJTUg1kjuLeQCJ+ccE4Vpa6kKVXkPYJ2mOCQyUuKLcLQsdrMCpBPUi8qVE6+YuaJkozeA9NusTAw3hLr8Xe5EQ==",
+      "integrity": "sha1-wZyd+aAocC1nhhI4SmVSQExjbRU=",
       "requires": {
         "fs.realpath": "1.0.0",
         "inflight": "1.0.6",
@@ -5155,7 +5155,7 @@
     "globals": {
       "version": "9.18.0",
       "resolved": "https://registry.npmjs.org/globals/-/globals-9.18.0.tgz",
-      "integrity": "sha512-S0nG3CLEQiY/ILxqtztTWH/3iRRdyBLw6KMDxnKMchrtbj2OFmehVh0WUCfW3DUrIgx/qFrJPICrq4Z4sTR9UQ=="
+      "integrity": "sha1-qjiWs+abSH8X4x7SFD1pqOMMLYo="
     },
     "globby": {
       "version": "5.0.0",
@@ -5490,7 +5490,7 @@
     "grunt-mocha-test": {
       "version": "0.13.3",
       "resolved": "https://registry.npmjs.org/grunt-mocha-test/-/grunt-mocha-test-0.13.3.tgz",
-      "integrity": "sha512-zQGEsi3d+ViPPi7/4jcj78afKKAKiAA5n61pknQYi25Ugik+aNOuRmiOkmb8mN2CeG8YxT+YdT1H1Q7B/eNkoQ==",
+      "integrity": "sha1-kChHK2Fb2m3eqnswpaFk6YBd4AU=",
       "dev": true,
       "requires": {
         "hooker": "0.2.3",
@@ -5656,7 +5656,7 @@
     "hash.js": {
       "version": "1.1.3",
       "resolved": "https://registry.npmjs.org/hash.js/-/hash.js-1.1.3.tgz",
-      "integrity": "sha512-/UETyP0W22QILqS+6HowevwhEFJ3MBJnwTf75Qob9Wz9t0DPuisL8kW8YZMK62dHAKE1c1p+gY1TtOLY+USEHA==",
+      "integrity": "sha1-NA3tvmKQGHFRweodd3o0SJNd+EY=",
       "requires": {
         "inherits": "2.0.3",
         "minimalistic-assert": "1.0.0"
@@ -5720,7 +5720,7 @@
     "hosted-git-info": {
       "version": "2.6.0",
       "resolved": "https://registry.npmjs.org/hosted-git-info/-/hosted-git-info-2.6.0.tgz",
-      "integrity": "sha512-lIbgIIQA3lz5XaB6vxakj6sDHADJiZadYEJB+FgA+C4nubM1NwcuvUr9EJPmnH1skZqpqUzWborWo8EIUi0Sdw=="
+      "integrity": "sha1-IyNbKasjDFdqqw1PE/wEawsDgiI="
     },
     "html-comment-regex": {
       "version": "1.1.1",
@@ -5826,7 +5826,7 @@
         "ansi-styles": {
           "version": "3.2.1",
           "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-3.2.1.tgz",
-          "integrity": "sha512-VT0ZI6kZRdTh8YyJw3SMbYm/u+NqfsAxEpWO0Pf9sq8/e94WxxOpPKx9FR1FlyCtOVDNOQ+8ntlqFxiRc+r5qA==",
+          "integrity": "sha1-QfuyAkPlCxK+DwS43tvwdSDOhB0=",
           "requires": {
             "color-convert": "1.9.1"
           }
@@ -5859,7 +5859,7 @@
         "source-map": {
           "version": "0.6.1",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
-          "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g=="
+          "integrity": "sha1-dHIq8y6WFOnCh6jQu95IteLxomM="
         },
         "supports-color": {
           "version": "5.3.0",
@@ -6066,7 +6066,7 @@
     "invariant": {
       "version": "2.2.4",
       "resolved": "https://registry.npmjs.org/invariant/-/invariant-2.2.4.tgz",
-      "integrity": "sha512-phJfQVBuaJM5raOpJjSfkiD6BpbCE4Ns//LaXl6wGYtUBY83nWS6Rf9tXm2e8VaK60JEjYldbPif/A2B1C2gNA==",
+      "integrity": "sha1-YQ88ksk1nOHbYW5TgAjSP/NRWOY=",
       "requires": {
         "loose-envify": "1.3.1"
       }
@@ -6089,7 +6089,7 @@
     "ipfs-api": {
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@@ -13075,7 +13094,7 @@
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@@ -13546,7 +13565,7 @@
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