added unit tests (#33)

.eslintrc

@@ -0,0 +1,7 @@
+{
+  "extends": "standard",
+  "plugins": ["jest"],
+  "env": {
+    "jest": true
+  }
+}

.gitignore

@@ -1 +1,2 @@
-node_modules
+node_modules
+coverage

jest.config.js

@@ -0,0 +1,12 @@
+module.exports = {
+  testEnvironment: 'node',
+  verbose: true,
+  collectCoverage: true,
+  testPathIgnorePatterns: [
+    '<rootDir>/src/*'
+  ],
+  collectCoverageFrom: [
+    'lib/**/*.js',
+    'simctl.js'
+  ]
+}

lib/simctl-extensions.js

@@ -1,7 +1,7 @@
 /*
 The MIT License (MIT)
 
-Copyright (c) 2014 Shazron Abdullah.
+Copyright (c) 2022 Shazron Abdullah.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -22,81 +22,87 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 
-var shell = require('shelljs');
-var path = require('path');
-var fs = require('fs');
-var util = require('util');
-var Tail = require('tail').Tail;
-
-var extensions = {
-    start: function (deviceid) {
-        var is_at_least_xcode_9 = false;
-
-        var command = 'xcodebuild -version';
-        var output = shell.exec(command, { silent: true }).output;
-
-        // parse output for Xcode version
-        var versionMatch = /Xcode (.*)/.exec(output);
-        if (!versionMatch) {
-            console.log('Unable to parse xcodebuild version.');
-            return;
-        } else {
-            is_at_least_xcode_9 = (parseInt(versionMatch[1]) >= 9);
-        }
-
-        if (is_at_least_xcode_9) {
-            // Xcode 9 or greater
-            command = util.format('xcrun simctl list -j');
-            var res = shell.exec(command, { silent: true });
-            if (res.code !== 0) {
-                console.log('Could not get device list.');
-                return;
-            }
-            var list_output = JSON.parse(res.output);
-            var device = Object.keys(list_output.devices)
-                .reduce(function (acc, key) { return acc.concat(list_output.devices[key]); }, [])
-                .find(function (el) { return el.udid === deviceid; });
-
-            if (device.state === 'Booted') {
-                // no need to launch the emulator, it is already running
-                console.log('Simulator already running.');
-                return;
-            }
-            command = util.format('xcrun simctl boot "%s"', deviceid);
-            shell.exec(command, { silent: true });
-            command = 'open `xcode-select -p`/Applications/Simulator.app';
-            return shell.exec(command, { silent: true });
-        } else {
-            // Xcode 8 or older
-            command = util.format('xcrun instruments -w "%s"', deviceid);
-            return shell.exec(command, { silent: true });
-        }
-    },
-
-    log: function (deviceid, filepath) {
-        var tail = new Tail(
-            path.join(process.env.HOME, 'Library/Logs/CoreSimulator', deviceid, 'system.log')
-        );
-
-        tail.on('line', function (data) {
-            if (filepath) {
-                fs.appendFile(filepath, data + '\n', function (error) {
-                    if (error) {
-                        console.error('ERROR: ', error);
-                        throw error;
-                    }
-                });
-            } else {
-                console.log(data);
-            }
-        });
-
-        tail.on('error', function (error) {
-            console.error('ERROR: ', error);
-        });
-
-        return tail;
+const shell = require('shelljs')
+const path = require('path')
+const fs = require('fs')
+const util = require('util')
+const Tail = require('tail').Tail
+
+const extensions = {
+  start: function (deviceid) {
+    let isAtLeastXcode9 = false
+
+    let command = 'xcodebuild -version'
+    const res = shell.exec(command, { silent: true })
+
+    // parse output for Xcode version
+    const versionMatch = /Xcode (.*)/.exec(res.output)
+    if (res.code !== 0 || !versionMatch) {
+      console.error('Unable to parse xcodebuild version.')
+      return
+    } else {
+      isAtLeastXcode9 = (parseInt(versionMatch[1]) >= 9)
+    }
+
+    if (isAtLeastXcode9) {
+      // Xcode 9 or greater
+      command = util.format('xcrun simctl list -j')
+      let res = shell.exec(command, { silent: true })
+      if (res.code !== 0) {
+        console.error('Could not get device list.')
+        return
+      }
+      const listOutput = JSON.parse(res.output)
+      const device = Object.keys(listOutput.devices)
+        .reduce(function (acc, key) { return acc.concat(listOutput.devices[key]) }, [])
+        .find(function (el) { return el.udid === deviceid })
+
+      if (device.state === 'Booted') {
+        // no need to launch the emulator, it is already running
+        console.error('Simulator already running.')
+        return
+      }
+      command = util.format('xcrun simctl boot "%s"', deviceid)
+      res = shell.exec(command, { silent: true })
+
+      if (res.code !== 0) {
+        console.error(`Could not boot simulator ${deviceid}`)
+        return
+      }
+
+      command = 'open `xcode-select -p`/Applications/Simulator.app'
+      return shell.exec(command, { silent: true })
+    } else {
+      // Xcode 8 or older
+      command = util.format('xcrun instruments -w "%s"', deviceid)
+      return shell.exec(command, { silent: true })
     }
-};
+  },
+
+  log: function (deviceid, filepath) {
+    const tail = new Tail(
+      path.join(process.env.HOME, 'Library/Logs/CoreSimulator', deviceid, 'system.log')
+    )
+
+    tail.on('line', function (data) {
+      if (filepath) {
+        fs.appendFile(filepath, data + '\n', function (error) {
+          if (error) {
+            console.error('ERROR: ', error)
+            throw error
+          }
+        })
+      } else {
+        console.log(data)
+      }
+    })
+
+    tail.on('error', function (error) {
+      console.error('ERROR: ', error)
+    })
+
+    return tail
+  }
+}
 
-exports = module.exports = extensions;
+exports = module.exports = extensions