diff --git a/.circleci/config.yml b/.circleci/config.yml
index ec972b1..d9cb6ae 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -2,13 +2,16 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/node:10-browsers
+      - image: circleci/python:2.7-node-browsers
     steps:
       - checkout
       - run:
           name: Install dependencies
           command: |
+            pipenv install
             npm install
+            pipenv run mozdownload --version latest --destination $HOME/firefox.tar.bz2
+            pipenv run mozinstall --destination $HOME $HOME/firefox.tar.bz2
       - run:
           name: Build extension
           command: |
@@ -17,9 +20,15 @@ jobs:
           name: Run linting checks
           command: |
             npm run lint
+      - run:
+          name: Run automated tests
+          command: |
+            pipenv run test -- --firefox_bin $HOME/firefox/firefox
       - run:
           name: Package extension as XPI
           command: |
             npm run package
       - store_artifacts:
           path: web-ext-artifacts
+      - store_artifacts:
+          path: gecko.log
diff --git a/.gitignore b/.gitignore
index ea9fc82..a26de97 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 node_modules
 web-ext-artifacts
 build
+gecko.log
diff --git a/Pipfile b/Pipfile
new file mode 100644
index 0000000..2622af5
--- /dev/null
+++ b/Pipfile
@@ -0,0 +1,18 @@
+[[source]]
+url = "https://pypi.org/simple"
+verify_ssl = true
+name = "pypi"
+
+[dev-packages]
+
+[packages]
+click = "*"
+marionette-client = "*"
+mozdownload = "*"
+mozinstall = "*"
+
+[requires]
+python_version = "2.7"
+
+[scripts]
+test = "npm test"
diff --git a/Pipfile.lock b/Pipfile.lock
new file mode 100644
index 0000000..454e8d3
--- /dev/null
+++ b/Pipfile.lock
@@ -0,0 +1,251 @@
+{
+    "_meta": {
+        "hash": {
+            "sha256": "5b6ba8e19281de5fdd31b2ced1fd9ece5591aacea4e432fe021c473d60657f61"
+        },
+        "pipfile-spec": 6,
+        "requires": {
+            "python_version": "2.7"
+        },
+        "sources": [
+            {
+                "name": "pypi",
+                "url": "https://pypi.org/simple",
+                "verify_ssl": true
+            }
+        ]
+    },
+    "default": {
+        "blessings": {
+            "hashes": [
+                "sha256:98e5854d805f50a5b58ac2333411b0482516a8210f23f43308baeb58d77c157d",
+                "sha256:b1fdd7e7a675295630f9ae71527a8ebc10bfefa236b3d6aa4932ee4462c17ba3",
+                "sha256:caad5211e7ba5afe04367cdd4cfc68fa886e2e08f6f35e76b7387d2109ccea6e"
+            ],
+            "version": "==1.7"
+        },
+        "browsermob-proxy": {
+            "hashes": [
+                "sha256:5f0e72767938d268999f1b56b0e8ff01cecd051bb868637ff550e25495cc840b",
+                "sha256:fb345bc2207fccdb8a584694c8d02d01c2cfc539c9d43bbed38f0c54e1abbbaf"
+            ],
+            "markers": "python_version != '3.2.*' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*' and python_version < '4' and python_version >= '2.6'",
+            "version": "==0.8.0"
+        },
+        "certifi": {
+            "hashes": [
+                "sha256:13e698f54293db9f89122b0581843a782ad0934a4fe0172d2a980ba77fc61bb7",
+                "sha256:9fa520c1bacfb634fa7af20a76bcbd3d5fb390481724c597da32c719a7dca4b0"
+            ],
+            "version": "==2018.4.16"
+        },
+        "chardet": {
+            "hashes": [
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
+            ],
+            "version": "==3.0.4"
+        },
+        "click": {
+            "hashes": [
+                "sha256:29f99fc6125fbc931b758dc053b3114e55c77a6e4c6c3a2674a2dc986016381d",
+                "sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b"
+            ],
+            "index": "pypi",
+            "version": "==6.7"
+        },
+        "idna": {
+            "hashes": [
+                "sha256:156a6814fb5ac1fc6850fb002e0852d56c0c8d2531923a51032d1b70760e186e",
+                "sha256:684a38a6f903c1d71d6d5fac066b58d7768af4de2b832e426ec79c30daa94a16"
+            ],
+            "version": "==2.7"
+        },
+        "manifestparser": {
+            "hashes": [
+                "sha256:adb0c58b8811711fc2220cb23620b7cd1fb7f61124cc61e2e54c592f90919619"
+            ],
+            "version": "==1.1"
+        },
+        "marionette-client": {
+            "hashes": [
+                "sha256:6bf104cfe75c1b3a8dfcfb6dfdd35427e96b3c31213eae6b34e5a670e695624e",
+                "sha256:d4ee1a2848215a42a12e99f5994a6a6da1aef6460146c142e22dfd3deb7f0291"
+            ],
+            "index": "pypi",
+            "version": "==3.3.0"
+        },
+        "marionette-driver": {
+            "hashes": [
+                "sha256:15c77ba548847dc05ce1b663a22c3324623f217dce5a859c3aaced31fd16707b",
+                "sha256:4b550e719f3d8245a51330bb4039a6f1972db9308a5707cac82a28266cdb3459"
+            ],
+            "version": "==2.7.0"
+        },
+        "mohawk": {
+            "hashes": [
+                "sha256:b3f85ffa93a5c7d2f9cc591246ef9f8ac4a9fa716bfd5bae0377699a2d89d78c",
+                "sha256:e98b331d9fa9ece7b8be26094cbe2d57613ae882133cc755167268a984bc0ab3"
+            ],
+            "version": "==0.3.4"
+        },
+        "mozcrash": {
+            "hashes": [
+                "sha256:3eb6568674056f58029bdc1dbfaa1ed53c3608b09d904466e6d697bbc1f8bc72",
+                "sha256:63c61f720beb045cd3ac668152cddfe96b25827cafd6bc98d9144bb1cd0e2008"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
+            "version": "==1.0"
+        },
+        "mozdevice": {
+            "hashes": [
+                "sha256:c3c50219127e36c171f84b2427e8fcf3a85457f336559aead9770b2a27fbc4b6"
+            ],
+            "version": "==1.0.0"
+        },
+        "mozdownload": {
+            "hashes": [
+                "sha256:5ca97e858e6fc0a37188ff72d0029e8b372e4b8d41181833281f718fa62c1ea9",
+                "sha256:efdcbc7e84b4a292c855c2753c659b19d018e3e2669b1f538e09b9c6f9a80f9b"
+            ],
+            "index": "pypi",
+            "version": "==1.23"
+        },
+        "mozfile": {
+            "hashes": [
+                "sha256:d3b00f336c6a89449bd78dd3ae65d74eb98497438d1ccfec07af0a736d20e957"
+            ],
+            "version": "==1.2"
+        },
+        "mozinfo": {
+            "hashes": [
+                "sha256:dcd53a1b1793340418e1ae42bf300e3e56d8f12047972378c6f9318b220b1023"
+            ],
+            "version": "==0.10"
+        },
+        "mozinstall": {
+            "hashes": [
+                "sha256:034e1e21cf5504324c74cab62944b25cedc7d2650054ec94f537055d6f581d7d",
+                "sha256:8a27c03a98f88f3998d5ba910b61b7f44f7aa43113f60e5b76bf4a860548cb89"
+            ],
+            "index": "pypi",
+            "version": "==1.16.0"
+        },
+        "mozlog": {
+            "hashes": [
+                "sha256:3c4386e6d07beca9f64ac176728205d69e822b3f19acccec8c52531ee1f9d957",
+                "sha256:a05718e9eeff693bc0509f6c66bd1fc68a5f14744bc7b2a67a06f0d8cc47a203"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
+            "version": "==3.8"
+        },
+        "moznetwork": {
+            "hashes": [
+                "sha256:5ac0d56cc46d7a080e4ff0742238360f72f43eb52191319df1b4021779e9d727"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
+            "version": "==0.27"
+        },
+        "mozprocess": {
+            "hashes": [
+                "sha256:9f3d533439f7721c90547bee0ecdf421c838e5976673430f6ea37db7a789b363",
+                "sha256:9f471c45bee9ff14e936c6ee216a6cc4941223659c01fa626bce628001d8485c"
+            ],
+            "version": "==0.26"
+        },
+        "mozprofile": {
+            "hashes": [
+                "sha256:25ffe505b9839ec8d044ddf7d829c21ad8618d1ae0e1e3a7e1278b3c5d1f1bb2",
+                "sha256:aa7fe7248719a224dd63cdc0498c9971d07cfc62fee7a69f51d593316b6bc1d8"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
+            "version": "==1.1.0"
+        },
+        "mozrunner": {
+            "hashes": [
+                "sha256:a4e3d532d1d7eb34b6332e0568612ebac3f56da849894005b3dbe68968e5d292"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
+            "version": "==7.0.1"
+        },
+        "mozterm": {
+            "hashes": [
+                "sha256:b1e91acec188de07c704dbb7b0100a7be5c1e06567b3beb67f6ea11d00a483a4",
+                "sha256:f5eafa25c23d391e2a2bb1dd45ee928fc9e3c811977a3856b5a5a0778011053c"
+            ],
+            "version": "==1.0.0"
+        },
+        "moztest": {
+            "hashes": [
+                "sha256:5ab589a30f24f608cd3ea31471bc315b3cf5037ad82f2cc324c1da4e30bee9dd",
+                "sha256:d4d154fa2fb7864ec27cf8026534c6c3df4bb218cd105f6382d63c2870368077"
+            ],
+            "version": "==0.8"
+        },
+        "mozversion": {
+            "hashes": [
+                "sha256:e4a8aad0a4748c8b4f1990ec52837d79be8564f30d097a10242d5a08c6b10206",
+                "sha256:e9b11e4a46bf7a4a11469ea4589c75f3ba50b34b7801e7edf1a09147af8bf70f"
+            ],
+            "markers": "python_version >= '2.7' and python_version != '3.0.*' and python_version != '3.1.*' and python_version != '3.2.*' and python_version != '3.3.*'",
+            "version": "==1.5"
+        },
+        "progressbar": {
+            "hashes": [
+                "sha256:b2d38a729785149e65323381d2e6fca0a5e9615a6d8bcf10bfa8adedfc481254"
+            ],
+            "version": "==2.3"
+        },
+        "redo": {
+            "hashes": [
+                "sha256:69ea97e4d934806475fe86f93e4f74da2994acab20c2e3cfe0d3ca6380e3f907"
+            ],
+            "version": "==1.6"
+        },
+        "requests": {
+            "hashes": [
+                "sha256:63b52e3c866428a224f97cab011de738c36aec0185aa91cfacd418b5d58911d1",
+                "sha256:ec22d826a36ed72a7358ff3fe56cbd4ba69dd7a6718ffd450ff0e9df7a47ce6a"
+            ],
+            "markers": "python_version != '3.2.*' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*' and python_version < '4' and python_version >= '2.6'",
+            "version": "==2.19.1"
+        },
+        "requests-hawk": {
+            "hashes": [
+                "sha256:aef0dff8053dcae2057774516386bed0a3bc03fabea9e18f3aa98f02672ea5d0",
+                "sha256:c2626ab31ebef0c81b97781c44c2275bfcc6d8e8520fc4ced495f0f386f8fe26"
+            ],
+            "markers": "python_version != '3.2.*' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*' and python_version < '4' and python_version >= '2.6'",
+            "version": "==1.0.0"
+        },
+        "six": {
+            "hashes": [
+                "sha256:70e8a77beed4562e7f14fe23a786b54f6296e34344c23bc42f07b15018ff98e9",
+                "sha256:832dc0e10feb1aa2c68dcc57dbb658f1c7e65b9b61af69048abc87a2db00a0eb"
+            ],
+            "version": "==1.11.0"
+        },
+        "treeherder-client": {
+            "hashes": [
+                "sha256:84690096902891bef2d9b555352f791510f9a280a76c8cf76a2730deccf8dc4b",
+                "sha256:e4221b867621afedcd88d076d8652435a8b62d5b0d1c0149afddce4516c2f0c4"
+            ],
+            "version": "==4.0.0"
+        },
+        "urllib3": {
+            "hashes": [
+                "sha256:a68ac5e15e76e7e5dd2b8f94007233e01effe3e50e8daddf69acfd81cb686baf",
+                "sha256:b5725a0bd4ba422ab0e66e89e030c806576753ea3ee08554382c14e685d117b5"
+            ],
+            "markers": "python_version != '3.2.*' and python_version != '3.3.*' and python_version != '3.0.*' and python_version != '3.1.*' and python_version < '4' and python_version >= '2.6'",
+            "version": "==1.23"
+        },
+        "wptserve": {
+            "hashes": [
+                "sha256:ef6aa5ca7c7cc802129eefab773172fac49281e50b34352a311d06426f237866"
+            ],
+            "version": "==1.4.0"
+        }
+    },
+    "develop": {}
+}
diff --git a/README.md b/README.md
index e6ebe8e..0ee9492 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,35 @@ Prerequisites:
    npm start
    ```
 
-## NPM Scripts
+## Running Tests
+
+Automated tests are run in a Firefox browser instance using [Marionette][]. We use the Python client for Marionette since there is no up-to-date JavaScript client.
+
+To set up your environment for running the tests, you must have:
+
+- A Firefox binary. On MacOS, this can be found within the `.app` folder at  `Firefox.app/Contents/MacOS/firefox`.
+- Python 2.7
+- [Pipenv][]
+
+With these installed, you can set up the test suite:
+
+1. Install Python dependencies:
+
+   ```sh
+   pipenv install
+   ```
+2. Save the path to your Firefox binary with `npm`:
+
+   ```sh
+   npm config set webext-commerce:firefox_bin <PATH_TO_FIREFOX_BINARY>
+   ```
+
+After this, you can run `pipenv run test` to run the automated test suite.
+
+[Marionette]: https://firefox-source-docs.mozilla.org/testing/marionette/marionette/index.html
+[Pipenv]: https://docs.pipenv.org/
+
+## Scripts
 
 | Command | Description |
 | --- | --- |
@@ -39,6 +67,7 @@ Prerequisites:
 | `npm run build` | Compile source files with Webpack |
 | `npm run watch` | Watch for changes and rebuild |
 | `npm run package` | Package the extension into an XPI file |
+| `pipenv run test` | Run test suite (See "Running Tests" for setup) |
 
 ## License
 
diff --git a/bin/run_tests.py b/bin/run_tests.py
new file mode 100755
index 0000000..1770779
--- /dev/null
+++ b/bin/run_tests.py
@@ -0,0 +1,85 @@
+#!/usr/bin/env python
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+"""
+Runs automated JavaScript tests by launching Firefox in headless mode
+and using the Marionette protocol to run the test code in Firefox.
+
+This script relies on path modifications from npm and should be run
+using the ``npm run test`` command.
+"""
+
+import os
+import sys
+from subprocess import check_call, PIPE, Popen, STDOUT
+from tempfile import mkstemp
+
+import click
+from marionette_driver.marionette import Marionette
+
+
+ROOT = os.path.abspath(os.path.join(os.path.dirname(__file__), '..'))
+
+
+@click.command()
+@click.option(
+    '--firefox_bin',
+    required=True,
+    envvar='npm_package_config_firefox_bin',
+    help='Path to Firefox binary',
+)
+def main(firefox_bin):
+    if not firefox_bin:
+        raise click.BadParameter(
+            'No Firefox binary found; configure the path to Firefox with `npm config`.'
+        )
+    elif not os.path.exists(firefox_bin):
+        raise click.BadParameter('Path to Firefox binary does not exist.')
+
+    click.echo('== Building test bundle with Webpack')
+    bundle_handle, bundle_path = mkstemp()
+    try:
+        webpack_config_path = os.path.join(ROOT, 'webpack.config.test.js')
+        check_call([
+            'webpack',
+            '--bail',
+            '--config', webpack_config_path,
+            '--output', bundle_path,
+        ])
+        with open(bundle_path) as f:
+            test_code = f.read()
+    finally:
+        os.remove(bundle_path)
+
+    click.echo('== Running tests')
+    client = None
+    try:
+        client = Marionette(bin=firefox_bin, headless=True)
+        client.start_session()
+        results = client.execute_async_script(test_code)
+    finally:
+        if client:
+            client.cleanup()
+
+    # Pipe output through formatter to make it readable.
+    reporter_env = os.environ.copy()
+    reporter_env.setdefault('TAP_COLORS', '1')  # Support color outpput
+    reporter = Popen(
+        ['tap-mocha-reporter', 'spec'],
+        stdout=PIPE,
+        stderr=STDOUT,
+        stdin=PIPE,
+        env=reporter_env,
+    )
+    formatted_output, stderr = reporter.communicate(results['output'])
+    click.echo(formatted_output)
+
+    # Exit with an error code if there were any failures
+    if results['failures'] > 0:
+        sys.exit(1)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/package-lock.json b/package-lock.json
index 1b8aeda..37e2da2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,5 +1,5 @@
 {
-  "name": "moz-commerce",
+  "name": "webext-commerce",
   "version": "0.1.0",
   "lockfileVersion": 1,
   "requires": true,
@@ -2492,6 +2492,12 @@
       "integrity": "sha1-SxQVMEz1ACjqgWQ2Q72C6gWANok=",
       "dev": true
     },
+    "color-support": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
+      "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
+      "dev": true
+    },
     "colors": {
       "version": "0.5.1",
       "resolved": "https://registry.npmjs.org/colors/-/colors-0.5.1.tgz",
@@ -3077,6 +3083,12 @@
         }
       }
     },
+    "defined": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/defined/-/defined-1.0.0.tgz",
+      "integrity": "sha1-yY2bzvdWdBiOEQlpFRGZ45sfppM=",
+      "dev": true
+    },
     "degenerator": {
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/degenerator/-/degenerator-1.0.4.tgz",
@@ -3164,6 +3176,12 @@
         "repeating": "^2.0.0"
       }
     },
+    "diff": {
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-1.4.0.tgz",
+      "integrity": "sha1-fyjS657nsVqX79ic5j3P2qPMur8=",
+      "dev": true
+    },
     "diffie-hellman": {
       "version": "5.0.3",
       "resolved": "https://registry.npmjs.org/diffie-hellman/-/diffie-hellman-5.0.3.tgz",
@@ -3185,6 +3203,12 @@
         "path-type": "^3.0.0"
       }
     },
+    "discontinuous-range": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/discontinuous-range/-/discontinuous-range-1.0.0.tgz",
+      "integrity": "sha1-44Mx8IRLukm5qctxx3FYWqsbxlo=",
+      "dev": true
+    },
     "dispensary": {
       "version": "0.18.0",
       "resolved": "https://registry.npmjs.org/dispensary/-/dispensary-0.18.0.tgz",
@@ -3473,6 +3497,55 @@
       "integrity": "sha1-blwtClYhtdra7O+AuQ7ftc13cvA=",
       "dev": true
     },
+    "enzyme": {
+      "version": "3.3.0",
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@@ -6459,6 +6564,12 @@
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@@ -8059,6 +8225,12 @@
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@@ -8113,6 +8285,18 @@
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@@ -9317,6 +9526,36 @@
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@@ -9727,6 +9966,15 @@
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@@ -9752,6 +10000,16 @@
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+      "requires": {
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@@ -10951,6 +11209,17 @@
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@@ -11248,12 +11517,78 @@
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+        "tap-parser": "^5.1.0",
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+      "resolved": "https://registry.npmjs.org/tap-parser/-/tap-parser-5.4.0.tgz",
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+        "readable-stream": "^2"
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       "integrity": "sha1-KcNXB8K3DlDQdIK10gLo7URtr9Q=",
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+        "resumer": "~0.0.0",
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+          "dev": true
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+          "dev": true,
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@@ -11640,6 +11975,16 @@
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+    "unicode-length": {
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+      "resolved": "https://registry.npmjs.org/unicode-length/-/unicode-length-1.0.3.tgz",
+      "integrity": "sha1-Wtp6f+1RhBpBijKM8UlHisg1irs=",
+      "dev": true,
+      "requires": {
+        "punycode": "^1.3.2",
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diff --git a/package.json b/package.json
index 0295f4b..9158b76 100644
--- a/package.json
+++ b/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "moz-commerce",
+  "name": "webext-commerce",
   "version": "0.1.0",
   "description": "",
   "private": "true",
@@ -10,7 +10,11 @@
     "build": "webpack --mode=development",
     "watch": "webpack --watch --mode=development",
     "package": "web-ext build --source-dir build --overwrite-dest",
-    "lint": "bin/run_lints.sh"
+    "lint": "bin/run_lints.sh",
+    "test": "bin/run_tests.py"
+  },
+  "config": {
+    "firefox_bin": ""
   },
   "devDependencies": {
     "babel-core": "6.26.3",
@@ -21,15 +25,20 @@
     "babel-preset-react": "6.24.1",
     "copy-webpack-plugin": "4.5.2",
     "css-loader": "1.0.0",
+    "enzyme": "3.3.0",
+    "enzyme-adapter-react-16": "1.1.1",
     "eslint": "4.19.1",
     "eslint-config-airbnb": "17.0.0",
     "eslint-import-resolver-webpack": "0.10.1",
     "eslint-plugin-import": "2.13.0",
     "eslint-plugin-jsx-a11y": "6.0.3",
     "eslint-plugin-react": "7.10.0",
+    "null-loader": "0.1.1",
     "style-loader": "0.21.0",
     "stylelint": "9.3.0",
     "stylelint-config-standard": "18.2.0",
+    "tap-mocha-reporter": "3.0.7",
+    "tape": "4.9.1",
     "web-ext": "2.7.0",
     "webpack": "4.15.1",
     "webpack-command": "0.3.1"
diff --git a/src/tests/.eslintrc.json b/src/tests/.eslintrc.json
new file mode 100644
index 0000000..56edc86
--- /dev/null
+++ b/src/tests/.eslintrc.json
@@ -0,0 +1,9 @@
+{
+  "rules": {
+    "import/no-extraneous-dependencies": ["error", {
+      "devDependencies": true,
+      "optionalDependencies": false,
+      "peerDependencies": false
+    }]
+  }
+}
diff --git a/src/tests/index.jsx b/src/tests/index.jsx
new file mode 100644
index 0000000..3b1b623
--- /dev/null
+++ b/src/tests/index.jsx
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Entry point for the automated test suite. This script is run inside a
+ * content-scoped sandbox in Firefox by Marionette. See bin/run_tests.py for
+ * more info.
+ */
+
+// marionetteScriptFinished is a wrapper added during the webpack build that
+// returns a value to run_tests.py and ends execution.
+/* global marionetteScriptFinished */
+
+import Enzyme from 'enzyme';
+import Adapter from 'enzyme-adapter-react-16';
+import test from 'tape';
+
+// Configure testing libraries
+Enzyme.configure({ adapter: new Adapter() });
+
+// Collect formatted output and count failures.
+let output = '';
+let failures = 0;
+test.createStream()
+  .on('data', (data) => {
+    output += data;
+  }).on('end', () => {
+    // Send the results back to run_tests.py
+    marionetteScriptFinished({output, failures});
+  });
+test.onFailure(() => failures++);
+
+// Import all files within the tests directory that have the word "test"
+// in their filename.
+const requireTest = require.context('.', true, /test.*\.jsx?$/);
+requireTest.keys().forEach(requireTest);
diff --git a/src/tests/sidebar/components/test_Accordion.jsx b/src/tests/sidebar/components/test_Accordion.jsx
new file mode 100644
index 0000000..131bae1
--- /dev/null
+++ b/src/tests/sidebar/components/test_Accordion.jsx
@@ -0,0 +1,16 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+import React from 'react';
+import {shallow} from 'enzyme';
+
+import test from 'tape';
+
+import Accordion from 'commerce/sidebar/components/Accordion';
+
+test('<Accordion> should apply the className prop to the returned container element', (t) => {
+  const wrapper = shallow(<Accordion className="foobar" />);
+  t.ok(wrapper.is('.foobar.accordion'), 'Accordion container has extra class');
+  t.end();
+});
diff --git a/webpack.config.js b/webpack.config.js
index 0412f2f..9dd7c9f 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -1,4 +1,13 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Webpack configuration for building the webextension.
+ */
+
 /* eslint-env node */
+
 const path = require('path');
 const CopyWebpackPlugin = require('copy-webpack-plugin');
 
diff --git a/webpack.config.test.js b/webpack.config.test.js
new file mode 100644
index 0000000..8bc5750
--- /dev/null
+++ b/webpack.config.test.js
@@ -0,0 +1,54 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * Webpack configuration for the automated test suite.
+ */
+
+/* eslint-env node */
+
+const path = require('path');
+const webpack = require('webpack');
+
+module.exports = {
+  mode: 'development',
+  devtool: 'eval-source-map',
+  target: 'web',
+  entry: {
+    tests: './src/tests/index',
+  },
+  module: {
+    rules: [
+      {
+        test: /\.jsx$/,
+        exclude: /node_modules/,
+        use: {
+          loader: 'babel-loader',
+        },
+      },
+      {
+        test: /\.css$/,
+        use: {
+          loader: 'null-loader',
+        },
+      },
+    ],
+  },
+  node: {
+    fs: 'empty',
+  },
+  plugins: [
+    new webpack.BannerPlugin({
+      banner: 'const marionetteScriptFinished = arguments[0];',
+      raw: true,
+      entryOnly: true,
+    }),
+  ],
+  resolve: {
+    extensions: ['.js', '.jsx'],
+    alias: {
+      commerce: path.resolve(__dirname, 'src'),
+    },
+  },
+};