diff --git a/.github/workflows/node.js.yml b/.github/workflows/node.js.yml
index 6983b15..a5c0925 100644
--- a/.github/workflows/node.js.yml
+++ b/.github/workflows/node.js.yml
@@ -16,5 +16,5 @@ jobs:
       with:
         node-version: 10.x
     - run: npm ci
-    - run: npm run build --if-present
+    - run: npm run build
     - run: npm test
diff --git a/babel.config.js b/babel.config.js
new file mode 100644
index 0000000..8283743
--- /dev/null
+++ b/babel.config.js
@@ -0,0 +1,3 @@
+module.exports = {
+  presets: [['@babel/preset-env', {targets: {node: 'current'}}]],
+};
diff --git a/package-lock.json b/package-lock.json
index c02a17e..7a576fb 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -4,18 +4,1621 @@
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
+    "@babel/code-frame": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.14.5.tgz",
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+      "dev": true,
+      "requires": {
+        "@babel/highlight": "^7.14.5"
+      }
+    },
+    "@babel/compat-data": {
+      "version": "7.14.5",
+      "resolved": "https://registry.npmjs.org/@babel/compat-data/-/compat-data-7.14.5.tgz",
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+      "dev": true
+    },
+    "@babel/core": {
+      "version": "7.14.6",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.14.6.tgz",
+      "integrity": "sha512-gJnOEWSqTk96qG5BoIrl5bVtc23DCycmIePPYnamY9RboYdI4nFy5vAQMSl81O5K/W0sLDWfGysnOECC+KUUCA==",
+      "dev": true,
+      "requires": {
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+        "@babel/generator": "^7.14.5",
+        "@babel/helper-compilation-targets": "^7.14.5",
+        "@babel/helper-module-transforms": "^7.14.5",
+        "@babel/helpers": "^7.14.6",
+        "@babel/parser": "^7.14.6",
+        "@babel/template": "^7.14.5",
+        "@babel/traverse": "^7.14.5",
+        "@babel/types": "^7.14.5",
+        "convert-source-map": "^1.7.0",
+        "debug": "^4.1.0",
+        "gensync": "^1.0.0-beta.2",
+        "json5": "^2.1.2",
+        "semver": "^6.3.0",
+        "source-map": "^0.5.0"
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+          "dev": true,
+          "requires": {
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+          "resolved": "https://registry.npmjs.org/json5/-/json5-2.2.0.tgz",
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+          "requires": {
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+          "dev": true
+        },
+        "semver": {
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+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw==",
+          "dev": true
+        },
+        "source-map": {
+          "version": "0.5.7",
+          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
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+      }
+    },
+    "w3c-xmlserializer": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-2.0.0.tgz",
+      "integrity": "sha512-4tzD0mF8iSiMiNs30BiLO3EpfGLZUT2MSX/G+o7ZywDzliWQ3OPtTZ0PTC3B3ca1UAf4cJMHB+2Bf56EriJuRA==",
+      "dev": true,
+      "requires": {
+        "xml-name-validator": "^3.0.0"
+      }
+    },
+    "walker": {
+      "version": "1.0.7",
+      "resolved": "https://registry.npmjs.org/walker/-/walker-1.0.7.tgz",
+      "integrity": "sha1-L3+bj9ENZ3JisYqITijRlhjgKPs=",
+      "dev": true,
+      "requires": {
+        "makeerror": "1.0.x"
+      }
+    },
     "watchpack": {
       "version": "1.7.5",
       "resolved": "https://registry.npmjs.org/watchpack/-/watchpack-1.7.5.tgz",
@@ -6709,6 +10490,12 @@
         "minimalistic-assert": "^1.0.0"
       }
     },
+    "webidl-conversions": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-6.1.0.tgz",
+      "integrity": "sha512-qBIvFLGiBpLjfwmYAaHPXsn+ho5xZnGvyGvsarywGNc8VyQJUMHJ8OBKGGrPER0okBeMDaan4mNBlgBROxuI8w==",
+      "dev": true
+    },
     "webpack": {
       "version": "4.46.0",
       "resolved": "https://registry.npmjs.org/webpack/-/webpack-4.46.0.tgz",
@@ -7129,6 +10916,32 @@
       "integrity": "sha512-OqedPIGOfsDlo31UNwYbCFMSaO9m9G/0faIHj5/dZFDMFqPTcx6UwqyOy3COEaEOg/9VsGIpdqn62W5KhoKSpg==",
       "dev": true
     },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      }
+    },
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
+      "dev": true
+    },
+    "whatwg-url": {
+      "version": "8.6.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-8.6.0.tgz",
+      "integrity": "sha512-os0KkeeqUOl7ccdDT1qqUcS4KH4tcBTSKK5Nl5WKb2lyxInIZ/CpjkqKa1Ss12mjfdcRX9mHmPPs7/SxG1Hbdw==",
+      "dev": true,
+      "requires": {
+        "lodash": "^4.7.0",
+        "tr46": "^2.1.0",
+        "webidl-conversions": "^6.1.0"
+      }
+    },
     "which": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
@@ -7230,6 +11043,18 @@
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8="
     },
+    "write-file-atomic": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "dev": true,
+      "requires": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
+    },
     "ws": {
       "version": "6.2.2",
       "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.2.tgz",
@@ -7239,6 +11064,18 @@
         "async-limiter": "~1.0.0"
       }
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
+      "integrity": "sha512-A5CUptxDsvxKJEU3yO6DuWBSJz/qizqzJKOMIfUJHETbBw/sFaDxgd6fxm1ewUaM0jZ444Fc5vC5ROYurg/4Pw==",
+      "dev": true
+    },
+    "xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "dev": true
+    },
     "xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
diff --git a/package.json b/package.json
index d12da0a..343a8ae 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,8 @@
   "scripts": {
     "start": "webpack serve",
     "build": "webpack",
-    "watch": "webpack --watch"
+    "watch": "webpack --watch",
+    "test": "jest"
   },
   "author": "",
   "license": "GPL-3.0",
@@ -21,8 +22,12 @@
     "svelte": "^3.38.2"
   },
   "devDependencies": {
+    "@babel/core": "^7.14.6",
+    "@babel/preset-env": "^7.14.5",
+    "babel-jest": "^27.0.2",
     "css-loader": "^5.2.6",
     "html-webpack-plugin": "^4.5.2",
+    "jest": "^27.0.4",
     "style-loader": "^2.0.0",
     "svelte-loader": "^3.1.2",
     "url-loader": "^4.1.1",
diff --git a/src/scaffolding/cloud.js b/src/scaffolding/cloud.js
index f9304f5..bb25558 100644
--- a/src/scaffolding/cloud.js
+++ b/src/scaffolding/cloud.js
@@ -75,7 +75,7 @@ class CloudManager {
   }
 }
 
-class WebSocketProvider  {
+class WebSocketProvider {
   constructor(cloudHost, projectId) {
     this.cloudHost = cloudHost;
     this.projectId = projectId;
diff --git a/test/scaffolding/cloud.test.js b/test/scaffolding/cloud.test.js
new file mode 100644
index 0000000..a8eded6
--- /dev/null
+++ b/test/scaffolding/cloud.test.js
@@ -0,0 +1,37 @@
+import Cloud from '../../src/scaffolding/cloud';
+
+const cloudManager = () => new Cloud.CloudManager({
+  vm: {
+    runtime: {
+      hasCloudData: () => true
+    }
+  }
+});
+
+const mockProvider = () => ({
+  enable: () => {},
+  handleUpdateVariable: jest.fn()
+});
+
+test('CloudManager providers and overrides', () => {
+  const manager = cloudManager();
+  const provider1 = mockProvider();
+  const provider2 = mockProvider();
+  expect(() => manager.addProviderOverride('test', provider1)).toThrow('Manager is not aware of this provider');
+
+  manager.addProvider(provider1);
+  manager.addProvider(provider2);
+  manager.updateVariable('test', '123');
+  expect(provider1.handleUpdateVariable).toHaveBeenCalledTimes(1);
+  expect(provider2.handleUpdateVariable).toHaveBeenCalledTimes(1);
+
+  manager.addProviderOverride('test', provider1);
+  manager.updateVariable('test', '456');
+  expect(provider1.handleUpdateVariable).toHaveBeenCalledTimes(2);
+  expect(provider2.handleUpdateVariable).toHaveBeenCalledTimes(1);
+
+  manager.addProviderOverride('test2', null);
+  manager.updateVariable('test2', '789');
+  expect(provider1.handleUpdateVariable).toHaveBeenCalledTimes(2);
+  expect(provider2.handleUpdateVariable).toHaveBeenCalledTimes(1);
+});