diff --git a/.circleci/config.yml b/.circleci/config.yml
index 265d628..c179d06 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -47,6 +47,55 @@ jobs:
         docker:
             - image: circleci/python:2.7-stretch-node-browsers
 
+    "python-3.7-install-test":
+        docker:
+            - image: circleci/python:3.7-stretch-node-browsers
+
+        environment:
+            PERCY_ENABLE: 0
+
+        steps:
+            - checkout
+
+            - run:
+                name: Write job name.
+                command: echo $CIRCLE_JOB > circlejob.txt
+
+            - restore_cache:
+                key: deps1-{{ .Branch }}-{{ checksum "circlejob.txt" }}-{{ checksum "tests/requirements.txt" }}-{{ checksum ".circleci/config.yml" }}
+
+            - run:
+                name: Create virtualenv
+                command: |
+                    sudo pip install virtualenv
+                    python -m venv venv || virtualenv venv
+
+            - run:
+                name: Install requirements
+                command: |
+                    . venv/bin/activate
+                    pip install -r tests/requirements.txt --quiet
+
+            - save_cache:
+                key: deps1-{{ .Branch }}-{{ checksum "circlejob.txt" }}-{{ checksum "tests/requirements.txt" }}-{{ checksum ".circleci/config.yml" }}
+                paths:
+                    - "venv"
+
+            - run:
+                name: Generate Project & test
+                command: |
+                    . venv/bin/activate
+                    mkdir test_component
+                    cd test_component
+                    cookiecutter .. --config-file ../tests/test_config.yaml --no-input
+                    cd test_component
+                    python -m venv venv
+                    . venv/bin/activate
+                    pip install -r tests/requirements.txt --quiet
+                    npm install --ignore-scripts
+                    npm run build:all
+                    pytest tests/test_usage.py --driver Chrome
+
 
 workflows:
     version: 2
@@ -54,3 +103,4 @@ workflows:
         jobs:
             - "python-3.6"
             - "python-2.7"
+            - "python-3.7-install-test"
diff --git a/hooks/post_gen_project.py b/hooks/post_gen_project.py
index d9b8130..3e8d813 100644
--- a/hooks/post_gen_project.py
+++ b/hooks/post_gen_project.py
@@ -4,8 +4,6 @@
 import sys
 import os
 import subprocess
-import json
-import collections
 
 install_deps = '{{cookiecutter.install_dependencies}}'
 project_shortname = '{{cookiecutter.project_shortname}}'
@@ -35,25 +33,6 @@ def _execute_command(cmd):
     return status
 
 
-# Patch up the package.json to use the venv python for class generation.
-# If install_dependencies is false, the venv must be created manually and
-# the requirements installed.
-print('Patching build command')
-
-with open('package.json', 'r+') as package_file:
-    package_json = json.load(package_file,
-                             object_pairs_hook=collections.OrderedDict)
-
-    package_json['scripts']['build:py'] \
-        = package_json['scripts']['build:py'].replace(
-        '%(python_path)', python_executable)
-
-    package_file.seek(0)
-    package_file.truncate(0)
-
-    json.dump(package_json, package_file, indent=4)
-
-
 if install_deps != 'True':
     print('`install_dependencies` is false!!', file=sys.stderr)
     print('Please create a venv in your project root'
@@ -91,7 +70,20 @@ def _execute_command(cmd):
 
 # Run the first build
 print('Building initial bundles...')
-_execute_command('npm run build:all')
+
+# Activating the venv and running the command
+# doesn't work on linux with subprocess.
+# The command need to run in the venv we just created to use the dash cmd.
+# But it also needs shell to be true for the command to work.
+# And shell doesn't work with `npm run` nor `. venv/bin/activate`
+# The command works in a terminal.
+_execute_command('{} -m dash.development.component_generator'
+                 ' ./src/lib/components'
+                 ' {{cookiecutter.project_shortname}}'
+                 .format(python_executable))
+
+_execute_command('npm run build:js')
+_execute_command('npm run build:js-dev')
 
 print('\n{} ready!\n'.format(project_shortname))
 
diff --git a/tests/requirements.txt b/tests/requirements.txt
index becc970..46f0f49 100644
--- a/tests/requirements.txt
+++ b/tests/requirements.txt
@@ -1,4 +1,4 @@
-dash
+dash>=0.31.0
 dash-html-components
 dash-core-components
 pytest
diff --git a/tests/test_config.yaml b/tests/test_config.yaml
new file mode 100644
index 0000000..c53810f
--- /dev/null
+++ b/tests/test_config.yaml
@@ -0,0 +1,9 @@
+default_context:
+  project_name: Test Component
+  project_shortname: test_component
+  component_name: TestComponent
+  author_name: Test
+  author_email: Test
+  license: MIT License
+  publish_on_npm: false
+  install_dependencies: false
diff --git a/tests/test_generate.py b/tests/test_generate.py
index fecf309..550eddd 100644
--- a/tests/test_generate.py
+++ b/tests/test_generate.py
@@ -16,14 +16,8 @@ def test_package_json(cookies):
 
     package_json = json.loads(result.project.join('package.json').read())
 
-    if sys.platform == 'win32':
-        python = os.path.join('venv', 'Scripts', 'python')
-    else:
-        python = os.path.join('venv', 'bin', 'python')
-
     assert package_json['name'] == 'test_component'
     assert package_json['license'] == 'MIT'
-    assert python in package_json['scripts']['build:py']
     assert package_json['author'] == \
         '{} {}'.format(default_context['author_name'],
                        default_context['author_email'])
diff --git a/{{cookiecutter.project_shortname}}/package.json b/{{cookiecutter.project_shortname}}/package.json
index 9e18ef8..b02b38f 100644
--- a/{{cookiecutter.project_shortname}}/package.json
+++ b/{{cookiecutter.project_shortname}}/package.json
@@ -9,8 +9,8 @@
     "prepublish": "npm run validate-init",
     "build:js-dev": "webpack --mode development",
     "build:js": "webpack --mode production",
-    "build:py": "node ./extract-meta.js src/lib/components > {{cookiecutter.project_shortname}}/metadata.json && copyfiles package.json {{cookiecutter.project_shortname}} && %(python_path) -c \"import dash; dash.development.component_loader.generate_classes('{{cookiecutter.project_shortname}}', '{{cookiecutter.project_shortname}}/metadata.json')\"",
-    "build:all": "npm run build:js & npm run build:js-dev & npm run build:py"
+    "build:py": "(. venv/bin/activate || venv\\scripts\\activate) && dash-generate-components ./src/lib/components {{ cookiecutter.project_shortname }}",
+    "build:all": "npm run build:js && npm run build:js-dev && npm run build:py"
   },
   "author": "{{ cookiecutter.author_name }} {{ cookiecutter.author_email }}",
   "license": "{% set _license_identifiers = {'MIT License': 'MIT','BSD License': 'BSD','ISC License': 'ISC','Apache Software License 2.0': 'Apache-2.0','GNU General Public License v3': 'GPL-3.0','Not open source': ''} %}{{ _license_identifiers[cookiecutter.license] }}",
diff --git a/{{cookiecutter.project_shortname}}/requirements.txt b/{{cookiecutter.project_shortname}}/requirements.txt
index 0b7f2dd..4846396 100644
--- a/{{cookiecutter.project_shortname}}/requirements.txt
+++ b/{{cookiecutter.project_shortname}}/requirements.txt
@@ -1,3 +1,3 @@
 # dash is required to call `build:py`
-dash
+dash>=0.31.0
 dash-html-components
\ No newline at end of file
diff --git a/{{cookiecutter.project_shortname}}/tests/requirements.txt b/{{cookiecutter.project_shortname}}/tests/requirements.txt
index 1fcc228..9697089 100644
--- a/{{cookiecutter.project_shortname}}/tests/requirements.txt
+++ b/{{cookiecutter.project_shortname}}/tests/requirements.txt
@@ -3,7 +3,7 @@
 # pip install -r requirements.txt
 
 chromedriver-binary
-dash
+dash>=0.31.0
 dash-core-components
 dash-html-components
 dash-renderer
diff --git a/{{cookiecutter.project_shortname}}/tests/test_usage.py b/{{cookiecutter.project_shortname}}/tests/test_usage.py
index b84d650..057b5a7 100644
--- a/{{cookiecutter.project_shortname}}/tests/test_usage.py
+++ b/{{cookiecutter.project_shortname}}/tests/test_usage.py
@@ -1,3 +1,6 @@
+import time
+
+
 # Basic test for the component rendering.
 def test_render_component(dash_app, selenium):
     # Start a dash app contained in `usage.py`
@@ -6,5 +9,23 @@ def test_render_component(dash_app, selenium):
     # and start it in a thread.
     app = dash_app('usage.py')
 
-    # Get the generated component with selenium
-    my_component = selenium.find_element_by_id('input')
+    # Get the generated component input with selenium
+    # The html input will be a children of the #input dash component
+    my_component = selenium.find_element_by_css_selector('#input > input')
+
+    assert 'my-value' == my_component.get_attribute('value')
+
+    # Clear the input
+    my_component.clear()
+
+    # Send keys to the custom input.
+    my_component.send_keys('Hello dash')
+
+    # Wait for the output callback to complete.
+    time.sleep(1)
+
+    # Get the output component.
+    output = selenium.find_element_by_id('output')
+
+    # assert the text has changed
+    assert output.text == 'You have entered Hello dash'