diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 0000000..75650ce
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,71 @@
+# Contributing to this repo
+
+## Setup
+
+### Personal access token (PAT)
+
+Follow [these](https://docs.github.com/en/authentication/keeping-your-account-and-data-secure/creating-a-personal-access-token) instructions to configurate a personal access token.
+
+Only permissions needed:
+- public_repo
+
+Save the token to a secure location. Click the "Configure SSO" button and "Authorize" if applicable.
+
+### Config
+
+```shell
+cp config.example.json config.json
+
+# Add your GitHub username and token
+$EDITOR config.json
+
+# Export the JSON credentials into an environment variable
+export CONFIG=$(<config.json)
+```
+
+## Virtual environment
+
+### Install dependencies
+Instructions for POSIX bash/zsh (see [here](https://docs.python.org/3/library/venv.html) for syntax for other shells):
+```shell
+python3 -m venv env
+source env/bin/activate
+python3 -m pip install --upgrade pip
+python3 -m pip install -r requirements.txt -r dev-requirements.txt
+source env/bin/activate
+```
+
+## Testing locally
+
+```shell
+PYTHONPATH=hubcap python -m pytest
+```
+
+## Run in test mode
+
+```shell
+export ENV=test
+./cron.sh
+```
+
+### Optional configuration environment variables
+```
+# Default value is the `git-tmp` directory within the current working directory
+# This directory will be deleted by default at the end of the run
+export GIT_TMP=git-tmp
+```
+
+### Optional parameters
+Preserve commits/build artifacts within the `$GIT_TMP` directory
+```
+export ENV=test
+./cron.sh --no-cleanup
+```
+
+## Run in production mode
+
+**WARNING:** Use with caution -- _will_ modify state.
+```shell
+export ENV=prod
+./cron.sh
+```
diff --git a/config.example.json b/config.example.json
index 99ad0bb..8863664 100644
--- a/config.example.json
+++ b/config.example.json
@@ -3,7 +3,7 @@
         "name": "github_user",
         "token": "pe4s0n@l-@cce$$-t0k3n"
     },
-    "remote": "git@github.com:org/hub.getdbt.com.git",
+    "remote": "git@github.com:dbt-labs/hub.getdbt.com.git",
     "push_branches": true,
     "one_branch_per_repo": true
 }
diff --git a/dev-requirements.txt b/dev-requirements.txt
new file mode 100644
index 0000000..7dad30d
--- /dev/null
+++ b/dev-requirements.txt
@@ -0,0 +1,2 @@
+black==22.6.0
+pytest
diff --git a/hubcap/__init__.py b/hubcap/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/hubcap/cmd.py b/hubcap/git_helper.py
similarity index 100%
rename from hubcap/cmd.py
rename to hubcap/git_helper.py
diff --git a/hubcap/hubcap.py b/hubcap/hubcap.py
index b428319..b23439c 100644
--- a/hubcap/hubcap.py
+++ b/hubcap/hubcap.py
@@ -10,7 +10,7 @@
 import package
 import release_carrier
 
-from cmd import *
+from git_helper import *
 from records import *
 
 # ==
diff --git a/hubcap/records.py b/hubcap/records.py
index bc51441..11c88b5 100644
--- a/hubcap/records.py
+++ b/hubcap/records.py
@@ -1,6 +1,6 @@
 '''Interface for objects useful to processing hub entries'''
 
-import cmd
+import git_helper
 import hashlib
 import json
 import logging
@@ -71,7 +71,7 @@ def run(self, main_dir):
         for tag in self.new_tags:
             # go to repo dir to checkout tag and tag-commit specific package list
             os.chdir(self.local_path_to_repo)
-            cmd.run_cmd(f'git checkout tags/{tag}')
+            git_helper.run_cmd(f'git checkout tags/{tag}')
             packages = package.parse_pkgs(Path(os.getcwd()))
 
             # return to hub and build spec
@@ -88,7 +88,7 @@ def run(self, main_dir):
 
             msg = f'hubcap: Adding tag {tag} for {self.github_username}/{self.github_repo_name}'
             logging.info(msg)
-            cmd.run_cmd('git add -A')
+            git_helper.run_cmd('git add -A')
             subprocess.run(args=['git', 'commit', '-am', f'{msg}'], capture_output=True)
 
         # if succesful return branchname
@@ -102,7 +102,7 @@ def cut_version_branch(self):
 
         completed_subprocess = subprocess.run(['git', 'checkout', '-q', '-b', branch_name])
         if completed_subprocess.returncode == 128:
-            run_cmd(f'git checkout -q {branch_name}')
+            git_helper.run_cmd(f'git checkout -q {branch_name}')
 
         return branch_name
 
diff --git a/hubcap/setup.py b/hubcap/setup.py
index 99fc7b7..4bcf0b5 100644
--- a/hubcap/setup.py
+++ b/hubcap/setup.py
@@ -9,7 +9,7 @@
 import requests
 
 from pathlib import Path
-from cmd import *
+from git_helper import *
 from records import *
 
 NOW = int(datetime.datetime.now().timestamp())
diff --git a/hubcap/version.py b/hubcap/version.py
index e442555..580ec50 100644
--- a/hubcap/version.py
+++ b/hubcap/version.py
@@ -6,7 +6,7 @@
 
 import package
 
-from cmd import *
+from git_helper import *
 
 
 def parse_semver_tag(tag):
diff --git a/tests/__init__.py b/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/tests/test_version_regex.py b/tests/test_version_regex.py
new file mode 100644
index 0000000..5b3b240
--- /dev/null
+++ b/tests/test_version_regex.py
@@ -0,0 +1,111 @@
+import pytest
+from hubcap.version import is_valid_semver_tag
+
+
+@pytest.fixture
+def semver_20_valid():
+    """Valid SemVer 2.0 versions"""
+    # Most test cases from https://regex101.com/r/Ly7O1x/3/
+    return [
+        # Begin test cases from https://regex101.com/r/Ly7O1x/3/
+        "0.0.4",
+        "1.2.3",
+        "10.20.30",
+        "1.1.2-prerelease+meta",
+        "1.1.2+meta",
+        "1.1.2+meta-valid",
+        "1.0.0-alpha",
+        "1.0.0-beta",
+        "1.0.0-alpha.beta",
+        "1.0.0-alpha.beta.1",
+        "1.0.0-alpha.1",
+        "1.0.0-alpha0.valid",
+        "1.0.0-alpha.0valid",
+        "1.0.0-alpha-a.b-c-somethinglong+build.1-aef.1-its-okay",
+        "1.0.0-rc.1+build.1",
+        "2.0.0-rc.1+build.123",
+        "1.2.3-beta",
+        "10.2.3-DEV-SNAPSHOT",
+        "1.2.3-SNAPSHOT-123",
+        "1.0.0",
+        "2.0.0",
+        "1.1.7",
+        "2.0.0+build.1848",
+        "2.0.1-alpha.1227",
+        "1.0.0-alpha+beta",
+        "1.2.3----RC-SNAPSHOT.12.9.1--.12+788",
+        "1.2.3----R-S.12.9.1--.12+meta",
+        "1.2.3----RC-SNAPSHOT.12.9.1--.12",
+        "1.0.0+0.build.1-rc.10000aaa-kk-0.1",
+        "99999999999999999999999.999999999999999999.99999999999999999",
+        "1.0.0-0A.is.legal",
+        # Begin custom test cases
+        "1.0.3-post1",
+        "0.8.0-a1",
+        "0.8.0-b2",
+        "0.8.0-rc3",
+    ]
+
+
+@pytest.fixture
+def semver_20_invalid():
+    """Invalid SemVer 2.0 versions"""
+    # Most test cases from https://regex101.com/r/Ly7O1x/3/
+    return [
+        # Begin test cases from https://regex101.com/r/Ly7O1x/3/
+        "1",
+        "1.2",
+        "1.2.3-0123",
+        "1.2.3-0123.0123",
+        "1.1.2+.123",
+        "+invalid",
+        "-invalid",
+        "-invalid+invalid",
+        "-invalid.01",
+        "alpha",
+        "alpha.beta",
+        "alpha.beta.1",
+        "alpha.1",
+        "alpha+beta",
+        "alpha_beta",
+        "alpha.",
+        "alpha..",
+        "beta",
+        "1.0.0-alpha_beta",
+        "-alpha.",
+        "1.0.0-alpha..",
+        "1.0.0-alpha..1",
+        "1.0.0-alpha...1",
+        "1.0.0-alpha....1",
+        "1.0.0-alpha.....1",
+        "1.0.0-alpha......1",
+        "1.0.0-alpha.......1",
+        "01.1.1",
+        "1.01.1",
+        "1.1.01",
+        "1.2",
+        "1.2.3.DEV",
+        "1.2-SNAPSHOT",
+        "1.2.31.2.3----RC-SNAPSHOT.12.09.1--..12+788",
+        "1.2-RC-SNAPSHOT",
+        "-1.0.3-gamma+b7718",
+        "+justmeta",
+        "9.8.7+meta+meta",
+        "9.8.7-whatever+meta+meta",
+        "99999999999999999999999.999999999999999999.99999999999999999----RC-SNAPSHOT.12.09.1--------------------------------..12",
+        # Begin custom test cases
+        "1.0.3.post1",
+        "0.8.0a1",
+        "0.8.0b2",
+        "0.8.0rc3",
+    ]
+
+
+def test_regex_valid(semver_20_valid):
+    for version in semver_20_valid:
+        assert is_valid_semver_tag(version)
+
+
+def test_regex_invalid(semver_20_invalid):
+    for version in semver_20_invalid:
+        assert not is_valid_semver_tag(version)