diff --git a/.gitignore b/.gitignore
index 59d842b..fa2fb0d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -26,3 +26,6 @@ node_modules
 
 # Users Environment Variables
 .lock-wscript
+
+#Intellij
+.idea/
diff --git a/.jshintrc b/.jshintrc
index 8c86fc7..c32ac02 100644
--- a/.jshintrc
+++ b/.jshintrc
@@ -10,5 +10,7 @@
   "unused": true,
   "boss": true,
   "eqnull": true,
-  "node": true
+  "node": true,
+  "mocha": true,
+  "esversion": 6
 }
diff --git a/.travis.yml b/.travis.yml
index b29cf66..26bd231 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,4 +1,8 @@
 language: node_js
 node_js:
-  - "4"
-  - "6"
+  - "12"
+  - "13"
+  - "14"
+  - "15"
+  - "16"
+  - "17"
diff --git a/README.md b/README.md
index fbeb0eb..ea698ea 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@ command-exists
 
 node module to check if a command-line command exists
 
-
+**supported Node Versions**: 12+
 
 ## installation
 
@@ -16,32 +16,35 @@ npm install command-exists
 ### async
 
 ```js
-var commandExists = require('command-exists');
+const commandExists = require('command-exists');
 
-commandExists('ls', function(err, commandExists) {
+commandExists('ls', function (err, commandExists) {
 
-    if(commandExists) {
+    if (commandExists) {
         // proceed confidently knowing this command is available
     }
 
 });
 ```
+
 ### promise
+
 ```js
-var commandExists = require('command-exists');
+const commandExists = require('command-exists');
 
 // invoked without a callback, it returns a promise
 commandExists('ls')
-.then(function(command){
-    // proceed
-}).catch(function(){
+    .then(function (command) {
+        // proceed
+    }).catch(function () {
     // command doesn't exist
 });
 ```
 
 ### sync
+
 ```js
-var commandExistsSync = require('command-exists').sync;
+const commandExistsSync = require('command-exists').sync;
 // returns true/false; doesn't throw
 if (commandExistsSync('ls')) {
     // proceed
@@ -51,10 +54,8 @@ if (commandExistsSync('ls')) {
 
 ```
 
-
 ## changelog
 
-
 ### v1.2.9
 
 Fix issue with absolute paths on Windows ([#24](https://github.com/mathisonian/command-exists/pull/24))
@@ -65,7 +66,7 @@ Fix issue with paths on Windows ([#21](https://github.com/mathisonian/command-ex
 
 ### v1.2.7
 
-Removes unnecessary printed output on windows.
+Removes unnecessary printed output on Windows.
 
 ### v1.2.6
 
diff --git a/appveyor.yml b/appveyor.yml
index 9790e67..03da634 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -10,11 +10,12 @@ matrix:
 
 environment:
   matrix:
-    - nodejs_version: "4"
-    - nodejs_version: "6"
-    - nodejs_version: "7"
-    - nodejs_version: "8"
-    - nodejs_version: "9"
+    - nodejs_version: "12"
+    - nodejs_version: "13"
+    - nodejs_version: "14"
+    - nodejs_version: "15"
+    - nodejs_version: "16"
+    - nodejs_version: "17"
 
 install:
   # install modules
@@ -28,4 +29,4 @@ test_script:
   - npm run test
 
 # Don't actually build.
-build: off
\ No newline at end of file
+build: off
diff --git a/lib/command-exists.js b/lib/command-exists.js
index 7c37ca3..e039f59 100644
--- a/lib/command-exists.js
+++ b/lib/command-exists.js
@@ -1,157 +1,158 @@
 'use strict';
 
-var exec = require('child_process').exec;
-var execSync = require('child_process').execSync;
-var fs = require('fs');
-var path = require('path');
-var access = fs.access;
-var accessSync = fs.accessSync;
-var constants = fs.constants || fs;
-
-var isUsingWindows = process.platform == 'win32'
-
-var fileNotExists = function(commandName, callback){
-    access(commandName, constants.F_OK,
-    function(err){
-        callback(!err);
+const exec = require('child_process').exec;
+const execSync = require('child_process').execSync;
+const fs = require('fs');
+const path = require('path');
+const access = fs.access;
+const accessSync = fs.accessSync;
+const constants = fs.constants || fs;
+
+const isUsingWindows = process.platform === 'win32';
+
+const isFile = function (commandName, callback) {
+    fs.lstat(commandName, function (err, stats) {
+        if (err) {
+            callback(!err);
+            return;
+        }
+        callback(stats.isFile());
     });
 };
 
-var fileNotExistsSync = function(commandName){
-    try{
-        accessSync(commandName, constants.F_OK);
+const isFileSync = function (commandName) {
+    try {
+        const stats = fs.lstatSync(commandName);
+        return stats.isFile();
+    } catch (e) {
         return false;
-    }catch(e){
-        return true;
     }
 };
 
-var localExecutable = function(commandName, callback){
+const localExecutable = function (commandName, callback) {
     access(commandName, constants.F_OK | constants.X_OK,
-        function(err){
-        callback(null, !err);
-    });
+        function (err) {
+            callback(null, !err);
+        });
 };
 
-var localExecutableSync = function(commandName){
-    try{
+const localExecutableSync = function (commandName) {
+    try {
         accessSync(commandName, constants.F_OK | constants.X_OK);
         return true;
-    }catch(e){
+    } catch (e) {
         return false;
     }
-}
+};
 
-var commandExistsUnix = function(commandName, cleanedCommandName, callback) {
+const commandExistsUnix = function (commandName, cleanedCommandName, callback) {
 
-    fileNotExists(commandName, function(isFile){
+    isFile(commandName, function (isFile) {
 
-        if(!isFile){
-            var child = exec('command -v ' + cleanedCommandName +
-                  ' 2>/dev/null' +
-                  ' && { echo >&1 ' + cleanedCommandName + '; exit 0; }',
-                  function (error, stdout, stderr) {
-                      callback(null, !!stdout);
-                  });
+        if (isFile && localExecutableSync(commandName)) {
+            localExecutable(commandName, callback);
             return;
         }
-
-        localExecutable(commandName, callback);
+        exec('command -v ' + cleanedCommandName +
+            ' 2>/dev/null' +
+            ' && { echo >&1 ' + cleanedCommandName + '; exit 0; }',
+            function (error, stdout) {
+                callback(null, !!stdout);
+            });
     });
+};
 
-}
-
-var commandExistsWindows = function(commandName, cleanedCommandName, callback) {
-  // Regex from Julio from: https://stackoverflow.com/questions/51494579/regex-windows-path-validator
-  if (!(/^(?!(?:.*\s|.*\.|\W+)$)(?:[a-zA-Z]:)?(?:(?:[^<>:"\|\?\*\n])+(?:\/\/|\/|\\\\|\\)?)+$/m.test(commandName))) {
-    callback(null, false);
-    return;
-  }
-  var child = exec('where ' + cleanedCommandName,
-    function (error) {
-      if (error !== null){
+const commandExistsWindows = function (commandName, cleanedCommandName, callback) {
+    // Regex from Julio from: https://stackoverflow.com/questions/51494579/regex-windows-path-validator
+    if (!(/^(?!(?:.*\s|.*\.|\W+)$)(?:[a-zA-Z]:)?(?:[^<>:"|?*\n]+(?:\/\/|\/|\\\\|\\)?)+$/m.test(commandName))) {
         callback(null, false);
-      } else {
-        callback(null, true);
-      }
+        return;
     }
-  )
-}
+    exec('where ' + cleanedCommandName,
+        function (error) {
+            if (error !== null) {
+                callback(null, false);
+            } else {
+                callback(null, true);
+            }
+        }
+    );
+};
 
-var commandExistsUnixSync = function(commandName, cleanedCommandName) {
-  if(fileNotExistsSync(commandName)){
-      try {
-        var stdout = execSync('command -v ' + cleanedCommandName +
-              ' 2>/dev/null' +
-              ' && { echo >&1 ' + cleanedCommandName + '; exit 0; }'
-              );
+const commandExistsUnixSync = function (commandName, cleanedCommandName) {
+    if (isFileSync(commandName) && localExecutableSync(commandName)) {
+        return true;
+    }
+    try {
+        const stdout = execSync('command -v ' + cleanedCommandName +
+            ' 2>/dev/null' +
+            ' && { echo >&1 ' + cleanedCommandName + '; exit 0; }'
+        );
         return !!stdout;
-      } catch (error) {
+    } catch (error) {
         return false;
-      }
-  }
-  return localExecutableSync(commandName);
-}
+    }
+};
 
-var commandExistsWindowsSync = function(commandName, cleanedCommandName, callback) {
-  // Regex from Julio from: https://stackoverflow.com/questions/51494579/regex-windows-path-validator
-  if (!(/^(?!(?:.*\s|.*\.|\W+)$)(?:[a-zA-Z]:)?(?:(?:[^<>:"\|\?\*\n])+(?:\/\/|\/|\\\\|\\)?)+$/m.test(commandName))) {
-    return false;
-  }
-  try {
-      var stdout = execSync('where ' + cleanedCommandName, {stdio: []});
-      return !!stdout;
-  } catch (error) {
-      return false;
-  }
-}
+const commandExistsWindowsSync = function (commandName, cleanedCommandName) {
+    // Regex from Julio from: https://stackoverflow.com/questions/51494579/regex-windows-path-validator
+    if (!(/^(?!(?:.*\s|.*\.|\W+)$)(?:[a-zA-Z]:)?(?:[^<>:"|?*\n]+(?:\/\/|\/|\\\\|\\)?)+$/m.test(commandName))) {
+        return false;
+    }
+    try {
+        const stdout = execSync('where ' + cleanedCommandName, {stdio: []});
+        return !!stdout;
+    } catch (error) {
+        return false;
+    }
+};
 
-var cleanInput = function(s) {
-  if (/[^A-Za-z0-9_\/:=-]/.test(s)) {
-    s = "'"+s.replace(/'/g,"'\\''")+"'";
-    s = s.replace(/^(?:'')+/g, '') // unduplicate single-quote at the beginning
-      .replace(/\\'''/g, "\\'" ); // remove non-escaped single-quote if there are enclosed between 2 escaped
-  }
-  return s;
-}
+let cleanInput = function (s) {
+    if (/[^A-Za-z0-9_\/:=-]/.test(s)) {
+        s = "'" + s.replace(/'/g, "'\\''") + "'";
+        s = s.replace(/^(?:'')+/g, '') // unduplicate single-quote at the beginning
+            .replace(/\\'''/g, "\\'"); // remove non-escaped single-quote if there are enclosed between 2 escaped
+    }
+    return s;
+};
 
 if (isUsingWindows) {
-  cleanInput = function(s) {
-    var isPathName = /[\\]/.test(s);
-    if (isPathName) {
-      var dirname = '"' + path.dirname(s) + '"';
-      var basename = '"' + path.basename(s) + '"';
-      return dirname + ':' + basename;
-    }
-    return '"' + s + '"';
-  }
+    cleanInput = function (s) {
+        const isPathName = /[\\]/.test(s);
+        if (isPathName) {
+            const dirname = '"' + path.dirname(s) + '"';
+            const basename = '"' + path.basename(s) + '"';
+            return dirname + ':' + basename;
+        }
+        return '"' + s + '"';
+    };
 }
 
 module.exports = function commandExists(commandName, callback) {
-  var cleanedCommandName = cleanInput(commandName);
-  if (!callback && typeof Promise !== 'undefined') {
-    return new Promise(function(resolve, reject){
-      commandExists(commandName, function(error, output) {
-        if (output) {
-          resolve(commandName);
-        } else {
-          reject(error);
-        }
-      });
-    });
-  }
-  if (isUsingWindows) {
-    commandExistsWindows(commandName, cleanedCommandName, callback);
-  } else {
-    commandExistsUnix(commandName, cleanedCommandName, callback);
-  }
+    const cleanedCommandName = cleanInput(commandName);
+    if (!callback && typeof Promise !== 'undefined') {
+        return new Promise(function (resolve, reject) {
+            commandExists(commandName, function (error, output) {
+                if (output) {
+                    resolve(commandName);
+                } else {
+                    reject(error);
+                }
+            });
+        });
+    }
+    if (isUsingWindows) {
+        commandExistsWindows(commandName, cleanedCommandName, callback);
+    } else {
+        commandExistsUnix(commandName, cleanedCommandName, callback);
+    }
 };
 
-module.exports.sync = function(commandName) {
-  var cleanedCommandName = cleanInput(commandName);
-  if (isUsingWindows) {
-    return commandExistsWindowsSync(commandName, cleanedCommandName);
-  } else {
-    return commandExistsUnixSync(commandName, cleanedCommandName);
-  }
+module.exports.sync = function (commandName) {
+    const cleanedCommandName = cleanInput(commandName);
+    if (isUsingWindows) {
+        return commandExistsWindowsSync(commandName, cleanedCommandName);
+    } else {
+        return commandExistsUnixSync(commandName, cleanedCommandName);
+    }
 };
diff --git a/package-lock.json b/package-lock.json
index 22a467c..d0dd9ae 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,15 +1,1181 @@
 {
   "name": "command-exists",
   "version": "1.2.9",
-  "lockfileVersion": 1,
+  "lockfileVersion": 2,
   "requires": true,
+  "packages": {
+    "": {
+      "name": "command-exists",
+      "version": "1.2.9",
+      "license": "MIT",
+      "devDependencies": {
+        "expect.js": "^0.3.1",
+        "jshint": "^2.9.1",
+        "mocha": "^9.2.2"
+      }
+    },
+    "node_modules/@ungap/promise-all-settled": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@ungap/promise-all-settled/-/promise-all-settled-1.1.2.tgz",
+      "integrity": "sha512-sL/cEvJWAnClXw0wHk85/2L0G6Sj8UB0Ctc1TEMbKSsmpRosqhwj9gWgFRZSrBr2f9tiXISwNhCPmlfqUqyb9Q==",
+      "dev": true
+    },
+    "node_modules/ansi-colors": {
+      "version": "4.1.1",
+      "resolved": "https://registry.npmjs.org/ansi-colors/-/ansi-colors-4.1.1.tgz",
+      "integrity": "sha512-JoX0apGbHaUJBNl6yF+p6JAFYZ666/hhCGKN5t9QFjbJQKUU/g8MNbFDbvfrgKXvI1QpZplPOnwIo99lX/AAmA==",
+      "dev": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-styles": {
+      "version": "4.3.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
+      "integrity": "sha512-zbB9rCJAT1rbjiVDb2hqKFHNYLxgtk8NURxZ3IZwD3F6NtxbXZQCnnSi1Lkx+IDohdPlFp222wVALIheZJQSEg==",
+      "dev": true,
+      "dependencies": {
+        "color-convert": "^2.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
+    "node_modules/anymatch": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-3.1.2.tgz",
+      "integrity": "sha512-P43ePfOAIupkguHUycrc4qJ9kz8ZiuOUijaETwX7THt0Y/GNK7v0aa8rY816xWjZ7rJdA5XdMcpVFTKMq+RvWg==",
+      "dev": true,
+      "dependencies": {
+        "normalize-path": "^3.0.0",
+        "picomatch": "^2.0.4"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/argparse": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
+      "integrity": "sha512-8+9WqebbFzpX9OR+Wa6O29asIogeRMzcGtAINdpMHHyAg10f05aSFVBbcEqGf/PXw1EjAZ+q2/bEBg3DvurK3Q==",
+      "dev": true
+    },
+    "node_modules/balanced-match": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+      "integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
+      "dev": true
+    },
+    "node_modules/binary-extensions": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/binary-extensions/-/binary-extensions-2.2.0.tgz",
+      "integrity": "sha512-jDctJ/IVQbZoJykoeHbhXpOlNBqGNcwXJKJog42E5HDPUwQTSdjCHdihjj0DlnheQ7blbT6dHOafNAiS8ooQKA==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/brace-expansion": {
+      "version": "1.1.11",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+      "integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
+      "dev": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/braces": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/braces/-/braces-3.0.2.tgz",
+      "integrity": "sha512-b8um+L1RzM3WDSzvhm6gIz1yfTbBt6YTlcEKAvsmqCZZFw46z626lVj9j1yEPW33H5H+lBQpZMP1k8l+78Ha0A==",
+      "dev": true,
+      "dependencies": {
+        "fill-range": "^7.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/browser-stdout": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/browser-stdout/-/browser-stdout-1.3.1.tgz",
+      "integrity": "sha512-qhAVI1+Av2X7qelOfAIYwXONood6XlZE/fXaBSmW/T5SzLAmCgzi+eiWE7fUvbHaeNBQH13UftjpXxsfLkMpgw==",
+      "dev": true
+    },
+    "node_modules/camelcase": {
+      "version": "6.3.0",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-6.3.0.tgz",
+      "integrity": "sha512-Gmy6FhYlCY7uOElZUSbxo2UCDH8owEk996gkbrpsgGtrJLM3J7jGxl9Ic7Qwwj4ivOE5AWZWRMecDdF7hqGjFA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/chalk": {
+      "version": "4.1.2",
+      "resolved": "https://registry.npmjs.org/chalk/-/chalk-4.1.2.tgz",
+      "integrity": "sha512-oKnbhFyRIXpUuez8iBMmyEa4nbj4IOQyuhc/wy9kY7/WVPcwIO9VA668Pu8RkO7+0G76SLROeyw9CpQ061i4mA==",
+      "dev": true,
+      "dependencies": {
+        "ansi-styles": "^4.1.0",
+        "supports-color": "^7.1.0"
+      },
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/chalk?sponsor=1"
+      }
+    },
+    "node_modules/chalk/node_modules/supports-color": {
+      "version": "7.2.0",
+      "resolved": "https://registry.npmjs.org/supports-color/-/supports-color-7.2.0.tgz",
+      "integrity": "sha512-qpCAvRl9stuOHveKsn7HncJRvv501qIacKzQlO/+Lwxc9+0q2wLyv4Dfvt80/DPn2pqOBsJdDiogXGR9+OvwRw==",
+      "dev": true,
+      "dependencies": {
+        "has-flag": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/chokidar": {
+      "version": "3.5.3",
+      "resolved": "https://registry.npmjs.org/chokidar/-/chokidar-3.5.3.tgz",
+      "integrity": "sha512-Dr3sfKRP6oTcjf2JmUmFJfeVMvXBdegxB0iVQ5eb2V10uFJUCAS8OByZdVAyVb8xXNz3GjjTgj9kLWsZTqE6kw==",
+      "dev": true,
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://paulmillr.com/funding/"
+        }
+      ],
+      "dependencies": {
+        "anymatch": "~3.1.2",
+        "braces": "~3.0.2",
+        "glob-parent": "~5.1.2",
+        "is-binary-path": "~2.1.0",
+        "is-glob": "~4.0.1",
+        "normalize-path": "~3.0.0",
+        "readdirp": "~3.6.0"
+      },
+      "engines": {
+        "node": ">= 8.10.0"
+      },
+      "optionalDependencies": {
+        "fsevents": "~2.3.2"
+      }
+    },
+    "node_modules/cli": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/cli/-/cli-1.0.1.tgz",
+      "integrity": "sha1-IoF1NPJL+klQw01TLUjsvGIbjBQ=",
+      "dev": true,
+      "dependencies": {
+        "exit": "0.1.2",
+        "glob": "^7.1.1"
+      },
+      "engines": {
+        "node": ">=0.2.5"
+      }
+    },
+    "node_modules/cliui": {
+      "version": "7.0.4",
+      "resolved": "https://registry.npmjs.org/cliui/-/cliui-7.0.4.tgz",
+      "integrity": "sha512-OcRE68cOsVMXp1Yvonl/fzkQOyjLSu/8bhPDfQt0e0/Eb283TKP20Fs2MqoPsr9SwA595rRCA+QMzYc9nBP+JQ==",
+      "dev": true,
+      "dependencies": {
+        "string-width": "^4.2.0",
+        "strip-ansi": "^6.0.0",
+        "wrap-ansi": "^7.0.0"
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/mocha/-/mocha-9.2.2.tgz",
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@@ -343,12 +1729,51 @@
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+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-5.0.0.tgz",
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 }
diff --git a/package.json b/package.json
index d25e4d3..c87201a 100644
--- a/package.json
+++ b/package.json
@@ -6,9 +6,12 @@
   "scripts": {
     "test": "mocha test/test.js"
   },
+  "engines": {
+    "node": ">=12.0.0"
+  },
   "repository": {
     "type": "git",
-    "url": "http://github.com/mathisonian/command-exists"
+    "url": "https://github.com/mathisonian/command-exists"
   },
   "keywords": [
     "cli",
@@ -27,6 +30,6 @@
   "devDependencies": {
     "expect.js": "^0.3.1",
     "jshint": "^2.9.1",
-    "mocha": "^2.5.3"
+    "mocha": "^9.2.2"
   }
 }
diff --git a/test/executable-shell-script b/test/executable-shell-script
new file mode 100755
index 0000000..b52e2b8
--- /dev/null
+++ b/test/executable-shell-script
@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "uwu"
diff --git a/test/non-executable-shell-script b/test/non-executable-shell-script
new file mode 100644
index 0000000..b52e2b8
--- /dev/null
+++ b/test/non-executable-shell-script
@@ -0,0 +1,2 @@
+#!/bin/sh
+echo "uwu"
diff --git a/test/test.js b/test/test.js
index 34670e6..5a328be 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,28 +1,29 @@
 'use strict';
 
-var expect = require('expect.js');
-var commandExists = require('..');
-var commandExistsSync = commandExists.sync;
-var resolve = require('path').resolve;
-var isUsingWindows = process.platform == 'win32'
-
-describe('commandExists', function(){
-    describe('async - callback', function() {
-        it('it should find a command named ls or xcopy', function(done){
-            var commandToUse = 'ls'
+const expect = require('expect.js');
+const commandExists = require('..');
+const fs = require('fs');
+const commandExistsSync = commandExists.sync;
+const resolve = require('path').resolve;
+const isUsingWindows = process.platform === 'win32';
+
+describe('commandExists', function () {
+    describe('async - callback', function () {
+        it('it should find a command named ls or xcopy', function (done) {
+            let commandToUse = 'ls';
             if (isUsingWindows) {
-                commandToUse = 'xcopy'
+                commandToUse = 'xcopy';
             }
 
-            commandExists(commandToUse, function(err, exists) {
+            commandExists(commandToUse, function (err, exists) {
                 expect(err).to.be(null);
                 expect(exists).to.be(true);
                 done();
             });
         });
 
-        it('it should not find a command named fdsafdsafdsafdsafdsa', function(done){
-            commandExists('fdsafdsafdsafdsafdsa', function(err, exists) {
+        it('it should not find a command named fdsafdsafdsafdsafdsa', function (done) {
+            commandExists('fdsafdsafdsafdsafdsa', function (err, exists) {
                 expect(err).to.be(null);
                 expect(exists).to.be(false);
                 done();
@@ -30,82 +31,81 @@ describe('commandExists', function(){
         });
     });
 
-    describe('async - promise', function() {
-        it('it should find a command named ls or xcopy', function(done){
-            var commandToUse = 'ls'
+    describe('async - promise', function () {
+        it('it should find a command named ls or xcopy', function (done) {
+            let commandToUse = 'ls';
             if (isUsingWindows) {
-                commandToUse = 'xcopy'
+                commandToUse = 'xcopy';
             }
 
             commandExists(commandToUse)
-            .then(function(command) {
-                expect(command).to.be(commandToUse);
-                done();
-            });
+                .then(function (command) {
+                    expect(command).to.be(commandToUse);
+                    done();
+                });
         });
 
-        it('it should not find a command named fdsafdsafdsafdsafdsa', function(done){
+        it('it should not find a command named fdsafdsafdsafdsafdsa', function (done) {
             commandExists('fdsafdsafdsafdsafdsa')
-            .then(function() {
-                // We should not execute this line.
-                expect(true).to.be(false);
-            })
-            .catch(function() {
-                done();
-            });
+                .then(function () {
+                    // We should not execute this line.
+                    expect(true).to.be(false);
+                })
+                .catch(function () {
+                    done();
+                });
         });
     });
 
-    describe('sync', function() {
-        it('it should find a command named ls or xcopy', function(){
-            var commandToUse = 'ls'
+    describe('sync', function () {
+        it('it should find a command named ls or xcopy', function () {
+            let commandToUse = 'ls';
             if (isUsingWindows) {
-                commandToUse = 'xcopy'
+                commandToUse = 'xcopy';
             }
             expect(commandExistsSync(commandToUse)).to.be(true);
         });
 
-        it('it should not find a command named fdsafdsafdsafdsafdsa', function(){
+        it('it should not find a command named fdsafdsafdsafdsafdsa', function () {
             expect(commandExistsSync('fdsafdsafdsafdsafdsa')).to.be(false);
         });
 
-        it('it should not find a command named ls or xcopy prefixed with some nonsense', function(){
-            var commandToUse = 'fdsafdsa ls'
+        it('it should not find a command named ls or xcopy prefixed with some nonsense', function () {
+            let commandToUse = 'fdsafdsa ls';
             if (isUsingWindows) {
-                commandToUse = 'fdsafdsaf xcopy'
+                commandToUse = 'fdsafdsaf xcopy';
             }
             expect(commandExistsSync(commandToUse)).to.be(false);
         });
 
-        it('it should not execute some nefarious code', function(){
+        it('it should not execute some nefarious code', function () {
             expect(commandExistsSync('ls; touch /tmp/foo0')).to.be(false);
         });
 
-        it('it should not execute some nefarious code', function(){
+        it('it should not execute some nefarious code', function () {
             expect(commandExistsSync('ls touch /tmp/foo0')).to.be(false);
         });
     });
 
-    describe('local file', function() {
-        it('it should report false if there is a non-executable file with that name', function(done) {
-            var commandToUse = 'test/non-executable-script.js'
+    describe('local file', function () {
+        it('it should report false if there is a non-executable file with that name', function (done) {
+            const commandToUse = 'test/non-executable-script.js';
             commandExists(commandToUse)
-                .then(function(command){
+                .then(function () {
                     // We should not execute this line.
                     expect(true).to.be(false);
-                }).catch(function(err){
-                    expect(err).to.be(null);
-                    done();
-                });
+                }).catch(function (err) {
+                expect(err).to.be(null);
+                done();
+            });
         });
 
 
         if (!isUsingWindows) {
-            it('it should report true if there is an executable file with that name', function(done) {
-                var commandToUse = 'test/executable-script.js'
+            it('it should report true if there is an executable file with that name', function (done) {
+                const commandToUse = 'test/executable-script.js';
                 commandExists(commandToUse)
-                    .then(function(command){
-                        // We should not execute this line.
+                    .then(function (command) {
                         expect(command).to.be(commandToUse);
                         done();
                     });
@@ -113,35 +113,103 @@ describe('commandExists', function(){
         }
 
         if (isUsingWindows) {
-            it('it should report true if there is an executable file with that name', function(done) {
-                var commandToUse = 'test\\executable-script.cmd'
+            it('it should report true if there is an executable file with that name', function (done) {
+                const commandToUse = 'test\\executable-script.cmd';
                 commandExists(commandToUse)
-                    .then(function(command){
+                    .then(function (command) {
                         expect(command).to.be(commandToUse);
                         done();
                     });
             });
 
-            it('it should report false if there is a double quotation mark in the file path', function() {
-                var commandToUse = 'test\\"executable-script.cmd'
+            it('it should report false if there is a double quotation mark in the file path', function () {
+                const commandToUse = 'test\\"executable-script.cmd';
                 expect(commandExists.sync(commandToUse)).to.be(false);
             });
         }
     });
 
-    describe('absolute path', function() {
-        it('it should report true if there is a command with that name in absolute path', function(done) {
-            var commandToUse = resolve('test/executable-script.js');
-            commandExists(commandToUse)
-            .then(function(command){
-                expect(command).to.be(commandToUse);
-                done();
+    describe('folder', function () {
+        const randomDirName = 'asdauwhbfuk';
+        before(function (){
+           fs.mkdirSync(randomDirName);
+        });
+
+        describe('sync', function () {
+            it('should return false cause its just a folder', function () {
+                expect(commandExistsSync(randomDirName)).to.be(false);
+            });
+        });
+
+        describe('async', function () {
+            it('should return false cause its just a folder', function (done) {
+                commandExists(randomDirName, function (command) {
+                    expect(command).to.be(null);
+                    done();
+                });
             });
         });
-        
-        it('it should report false if there is not a command with that name in absolute path', function() {
-            var commandToUse = resolve('executable-script.js');
+
+        after(function (){
+           fs.rmdirSync(randomDirName);
+        });
+    });
+
+    describe('absolute path', function () {
+        it('it should report true if there is a command with that name in absolute path', function (done) {
+            const commandToUse = resolve('test/executable-script.js');
+            commandExists(commandToUse)
+                .then(function (command) {
+                    expect(command).to.be(commandToUse);
+                    done();
+                });
+        });
+
+        it('it should report false if there is not a command with that name in absolute path', function () {
+            const commandToUse = resolve('executable-script.js');
             expect(commandExists.sync(commandToUse)).to.be(false);
         });
     });
+
+    describe('local file "conflicting" with env', function () {
+        let scriptName = 'executable-shell-script';
+        if(isUsingWindows) {
+            scriptName = 'executable-script.cmd';
+        }
+        before(function () {
+            if(isUsingWindows){
+                fs.mkdirSync(scriptName);
+            }else {
+                fs.copyFileSync('test/non-executable-shell-script', scriptName);
+            }
+            process.env['PATH'] += ';'+resolve('test/');
+        });
+
+        describe('sync', function () {
+            it('it should report true if there is a command with that name in env but the absolut path is not executable', function () {
+                expect(commandExistsSync(scriptName)).to.be(true);
+            });
+        });
+
+        describe('async', function () {
+            it('it should report the command if it is in the env but the absolut path is not executable', function (done) {
+                commandExists(scriptName)
+                    .then(function (command) {
+                        expect(command).to.be(scriptName);
+                        done();
+                    }).catch(function (reason) {
+                        console.log(reason);
+                    }
+                );
+            });
+        });
+
+        after(function () {
+            if(isUsingWindows){
+                fs.rmdirSync(scriptName);
+            }else {
+                fs.unlinkSync(scriptName);
+            }
+        });
+    });
 });