diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 3c98baf21..576dc387d 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -54,13 +54,12 @@ Windows:
 npm install -g windows-build-tools
 ```
 
-
 #### lerna
 
 n8n is split up in different modules which are all in a single mono repository.
 To facilitate those modules management, [lerna](https://lerna.js.org) gets
 used. It automatically sets up file-links between modules which depend on each
-others.
+other.
 
 So for the setup to work correctly lerna has to be installed globally like this:
 
@@ -79,17 +78,17 @@ checked out and set up:
 	git clone https://github.com/n8n-io/n8n.git
 	```
 
-2. Go into repository folder
+1. Go into repository folder
 	```
 	cd n8n
 	```
 
-3. Install all dependencies of all modules and link them together:
+1. Install all dependencies of all modules and link them together:
 	```
 	lerna bootstrap --hoist
 	```
 
-4. Build all the code:
+1. Build all the code:
 	```
 	npm run build
 	```
@@ -103,3 +102,39 @@ To start n8n execute:
 ```
 npm run start
 ```
+
+
+## Development Cycle
+
+While iterating on n8n modules code, you can run `npm run dev`. It will then
+automatically build your code, restart the backend and refresh the frontend
+(editor-ui) on every change you make.
+
+1. Start n8n in development mode:
+	```
+	npm run dev
+	```
+1. hack, hack, hack
+1. Check if everything still runs in production mode
+	```
+	npm run build
+	npm run start
+	```
+1. Create tests
+1. Run all tests
+	```
+	npm run test
+	```
+1. Commit code and create pull request
+
+
+### Test suite
+
+The tests can be started via:
+```
+npm run test
+```
+
+If that gets executed in one of the package folders it will only run the tests
+of this package. If it gets executed in the n8n-root folder it will run all
+tests of all packages.
diff --git a/package.json b/package.json
index efb658e2e..f557ffb9f 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,7 @@
 		"build": "lerna exec npm run build",
 		"dev": "lerna exec npm run dev --parallel",
 		"start": "cd packages/cli && node dist/index.js start",
+		"test": "lerna run test",
 		"watch": "lerna run --parallel watch"
 	},
 	"devDependencies": {
diff --git a/packages/cli/test/placeholder.test.ts b/packages/cli/test/placeholder.test.ts
new file mode 100644
index 000000000..23ba06a64
--- /dev/null
+++ b/packages/cli/test/placeholder.test.ts
@@ -0,0 +1,7 @@
+describe('Placeholder', () => {
+
+	test('example', () => {
+		expect(1 + 1).toEqual(2);
+	});
+
+});
diff --git a/packages/editor-ui/package.json b/packages/editor-ui/package.json
index 72da793cb..e13f0244d 100644
--- a/packages/editor-ui/package.json
+++ b/packages/editor-ui/package.json
@@ -16,6 +16,7 @@
     "dev": "npm run serve",
     "lint": "vue-cli-service lint",
     "serve": "VUE_APP_URL_BASE_API=http://localhost:5678/ vue-cli-service serve",
+    "test": "npm run test:unit",
     "tslint": "tslint -p tsconfig.json -c tslint.json",
     "test:e2e": "vue-cli-service test:e2e",
     "test:unit": "vue-cli-service test:unit"
diff --git a/packages/editor-ui/tests/unit/example.spec.ts b/packages/editor-ui/tests/unit/example.spec.ts
deleted file mode 100644
index b8005575b..000000000
--- a/packages/editor-ui/tests/unit/example.spec.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-// import { shallowMount } from '@vue/test-utils';
-// import HelloWorld from '@/components/HelloWorld.vue';
-
-// describe('HelloWorld.vue', () => {
-//   it('renders props.msg when passed', () => {
-//     const msg = 'new message';
-//     const wrapper = shallowMount(HelloWorld, {
-//       propsData: { msg }
-//     });
-//     expect(wrapper.text()).toMatch(msg);
-//   });
-// });
diff --git a/packages/editor-ui/tests/unit/placeholder.spec.ts b/packages/editor-ui/tests/unit/placeholder.spec.ts
new file mode 100644
index 000000000..21c4bf29e
--- /dev/null
+++ b/packages/editor-ui/tests/unit/placeholder.spec.ts
@@ -0,0 +1,5 @@
+describe('Placeholder.vue', () => {
+	it('example', () => {
+		expect(1 + 1).toEqual(2);
+	});
+});
diff --git a/packages/node-dev/package.json b/packages/node-dev/package.json
index bd3108726..b1ecdb2fa 100644
--- a/packages/node-dev/package.json
+++ b/packages/node-dev/package.json
@@ -16,6 +16,7 @@
     "scripts": {
         "dev": "npm run watch",
         "build": "tsc",
+        "test": "jest",
         "tslint": "tslint -p tsconfig.json -c tslint.json",
         "watch": "tsc --watch"
     },
@@ -45,5 +46,23 @@
         "replace-in-file": "^4.1.0",
         "typescript": "~3.5.2",
         "vorpal": "^1.12.0"
+    },
+    "jest": {
+        "transform": {
+            "^.+\\.tsx?$": "ts-jest"
+        },
+        "testURL": "http://localhost/",
+        "testRegex": "(/__tests__/.*|(\\.|/)(test|spec))\\.(jsx?|tsx?)$",
+        "testPathIgnorePatterns": [
+            "/dist/",
+            "/node_modules/"
+        ],
+        "moduleFileExtensions": [
+            "ts",
+            "tsx",
+            "js",
+            "json",
+            "node"
+        ]
     }
 }
diff --git a/packages/node-dev/test/placeholder.test.ts b/packages/node-dev/test/placeholder.test.ts
new file mode 100644
index 000000000..23ba06a64
--- /dev/null
+++ b/packages/node-dev/test/placeholder.test.ts
@@ -0,0 +1,7 @@
+describe('Placeholder', () => {
+
+	test('example', () => {
+		expect(1 + 1).toEqual(2);
+	});
+
+});
diff --git a/packages/node-dev/tsconfig.json b/packages/node-dev/tsconfig.json
index 97c769b1b..cfc2e2af1 100644
--- a/packages/node-dev/tsconfig.json
+++ b/packages/node-dev/tsconfig.json
@@ -4,7 +4,8 @@
 			"es2017"
 		],
 		"types": [
-			"node"
+			"node",
+			"jest"
 		],
 		"module": "commonjs",
 		"esModuleInterop": true,
@@ -26,6 +27,7 @@
 	],
 	"exclude": [
 		"dist",
+		"node_modules/**/*",
 		"**/*.spec.ts"
 	]
 }
diff --git a/packages/nodes-base/test/placeholder.test.ts b/packages/nodes-base/test/placeholder.test.ts
new file mode 100644
index 000000000..23ba06a64
--- /dev/null
+++ b/packages/nodes-base/test/placeholder.test.ts
@@ -0,0 +1,7 @@
+describe('Placeholder', () => {
+
+	test('example', () => {
+		expect(1 + 1).toEqual(2);
+	});
+
+});