diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5c5441f..7adcaa9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ and this project tries to adhere to [Semantic Versioning](https://semver.org/spe
 
 ## [Unreleased]
 
+### Changed
+
+* Compatible with Python stretching back to version 3.7
+
 ## [0.4] - 2021-12-06
 
 ### Added 
diff --git a/README.md b/README.md
index 2c0854e..31a8a2c 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 
 Can take an export of nomie habits in json format and convert it to be importable in Loop Habit Tracker.
 
-Confirmed working for nomie version 5.6.4 and Loop Habit Tracker version 2.0.2. 
+Confirmed working for nomie version 5.6.4 and Loop Habit Tracker version 2.0.2 and 2.0.3. 
 Presumably works for other nomie 5.x versions and other Loop 2.x versions as well, 
 but that is untested.
 
@@ -15,6 +15,8 @@ Can also take an existing Loop Habit database (exported from the application),
 and add the nomie exported habits and checkmarks to it.
 Simply put the exported Loop database in the same directory and call it `output.db`, 
 it will not (should not™️) overwrite anything.
+If there are any duplicated habits however, 
+it will add duplications of the existing repetitions into the database.
 
 Invoked like: `python run.py nomie-export.json`.
 Note, however, that -- until a packaged version is released -- you will need to have some packages in your environment.
@@ -30,15 +32,3 @@ In the future there might be an easier road to using this package but that's the
 The package can also be used as a library to load nomie data
 or move data into Loop Habit Tracker.
 
-
-## Roadmap
-
-* [ ] clean up README
-* [ ] begin adding tests
-    * [ ] add some unit tests for various functions
-    * [ ] and at least an integration test for the stable database (loop-2021-12-02.db or equivalent)
-* [ ] abstract migration target away from loop
-* [ ] abstract import away from nomie
-* [ ] abstract importer/migrator themselves to work with other targets
-* [ ] allow migration to/from nomie/loop
-
diff --git a/noxfile.py b/noxfile.py
new file mode 100644
index 0000000..f056b7a
--- /dev/null
+++ b/noxfile.py
@@ -0,0 +1,9 @@
+import nox
+
+
+@nox.session(python=["3.7", "3.8", "3.9"])
+def tests(session):
+    args = session.posargs or ["--cov"]
+    session.run("poetry", "install", external=True)
+    session.run("pytest", *args)
+    pass
diff --git a/poetry.lock b/poetry.lock
index 015f3c1..f5775b8 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -30,6 +30,7 @@ python-versions = ">=3.6"
 
 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
+importlib-metadata = {version = "*", markers = "python_version < \"3.8\""}
 
 [[package]]
 name = "colorama"
@@ -53,6 +54,21 @@ tomli = {version = "*", optional = true, markers = "extra == \"toml\""}
 [package.extras]
 toml = ["tomli"]
 
+[[package]]
+name = "importlib-metadata"
+version = "0.23"
+description = "Read metadata from Python packages"
+category = "main"
+optional = false
+python-versions = ">=2.7,!=3.0,!=3.1,!=3.2,!=3.3"
+
+[package.dependencies]
+zipp = ">=0.5"
+
+[package.extras]
+docs = ["sphinx", "rst.linker"]
+testing = ["packaging", "importlib-resources"]
+
 [[package]]
 name = "iniconfig"
 version = "1.1.1"
@@ -80,6 +96,9 @@ category = "dev"
 optional = false
 python-versions = ">=3.6"
 
+[package.dependencies]
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+
 [package.extras]
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
@@ -115,6 +134,7 @@ python-versions = ">=3.6"
 atomicwrites = {version = ">=1.0", markers = "sys_platform == \"win32\""}
 attrs = ">=19.2.0"
 colorama = {version = "*", markers = "sys_platform == \"win32\""}
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
 iniconfig = "*"
 packaging = "*"
 pluggy = ">=0.12,<2.0"
@@ -139,6 +159,20 @@ pytest = ">=4.6"
 [package.extras]
 testing = ["fields", "hunter", "process-tests", "six", "pytest-xdist", "virtualenv"]
 
+[[package]]
+name = "pytest-mock"
+version = "3.6.1"
+description = "Thin-wrapper around the mock package for easier use with pytest"
+category = "dev"
+optional = false
+python-versions = ">=3.6"
+
+[package.dependencies]
+pytest = ">=5.0"
+
+[package.extras]
+dev = ["pre-commit", "tox", "pytest-asyncio"]
+
 [[package]]
 name = "toml"
 version = "0.10.2"
@@ -149,16 +183,28 @@ python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
 
 [[package]]
 name = "tomli"
-version = "1.2.2"
+version = "2.0.0"
 description = "A lil' TOML parser"
 category = "dev"
 optional = false
+python-versions = ">=3.7"
+
+[[package]]
+name = "zipp"
+version = "3.6.0"
+description = "Backport of pathlib-compatible object wrapper for zip files"
+category = "main"
+optional = false
 python-versions = ">=3.6"
 
+[package.extras]
+docs = ["sphinx", "jaraco.packaging (>=8.2)", "rst.linker (>=1.9)"]
+testing = ["pytest (>=4.6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-cov", "pytest-enabler (>=1.0.1)", "jaraco.itertools", "func-timeout", "pytest-black (>=0.3.7)", "pytest-mypy"]
+
 [metadata]
 lock-version = "1.1"
-python-versions = "^3.9"
-content-hash = "47104052627c5737e341ecfb58eb57c259f5baf5c99d7251dc860b331e18bee0"
+python-versions = "^3.7"
+content-hash = "fec236ab912efe582781c62e4cd2c4cd7e609557e284e067fa875f30ab806d93"
 
 [metadata.files]
 atomicwrites = [
@@ -226,6 +272,10 @@ coverage = [
     {file = "coverage-6.2-pp36.pp37.pp38-none-any.whl", hash = "sha256:5829192582c0ec8ca4a2532407bc14c2f338d9878a10442f5d03804a95fac9de"},
     {file = "coverage-6.2.tar.gz", hash = "sha256:e2cad8093172b7d1595b4ad66f24270808658e11acf43a8f95b41276162eb5b8"},
 ]
+importlib-metadata = [
+    {file = "importlib_metadata-0.23-py2.py3-none-any.whl", hash = "sha256:d5f18a79777f3aa179c145737780282e27b508fc8fd688cb17c7a813e8bd39af"},
+    {file = "importlib_metadata-0.23.tar.gz", hash = "sha256:aa18d7378b00b40847790e7c27e11673d7fed219354109d0e7b9e5b25dc3ad26"},
+]
 iniconfig = [
     {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
     {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
@@ -254,11 +304,19 @@ pytest-cov = [
     {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
     {file = "pytest_cov-3.0.0-py3-none-any.whl", hash = "sha256:578d5d15ac4a25e5f961c938b85a05b09fdaae9deef3bb6de9a6e766622ca7a6"},
 ]
+pytest-mock = [
+    {file = "pytest-mock-3.6.1.tar.gz", hash = "sha256:40217a058c52a63f1042f0784f62009e976ba824c418cced42e88d5f40ab0e62"},
+    {file = "pytest_mock-3.6.1-py3-none-any.whl", hash = "sha256:30c2f2cc9759e76eee674b81ea28c9f0b94f8f0445a1b87762cadf774f0df7e3"},
+]
 toml = [
     {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
     {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
 ]
 tomli = [
-    {file = "tomli-1.2.2-py3-none-any.whl", hash = "sha256:f04066f68f5554911363063a30b108d2b5a5b1a010aa8b6132af78489fe3aade"},
-    {file = "tomli-1.2.2.tar.gz", hash = "sha256:c6ce0015eb38820eaf32b5db832dbc26deb3dd427bd5f6556cf0acac2c214fee"},
+    {file = "tomli-2.0.0-py3-none-any.whl", hash = "sha256:b5bde28da1fed24b9bd1d4d2b8cba62300bfb4ec9a6187a957e8ddb9434c5224"},
+    {file = "tomli-2.0.0.tar.gz", hash = "sha256:c292c34f58502a1eb2bbb9f5bbc9a5ebc37bee10ffb8c2d6bbdfa8eb13cc14e1"},
+]
+zipp = [
+    {file = "zipp-3.6.0-py3-none-any.whl", hash = "sha256:9fe5ea21568a0a70e50f273397638d39b03353731e6cbbb3fd8502a33fec40bc"},
+    {file = "zipp-3.6.0.tar.gz", hash = "sha256:71c644c5369f4a6e07636f0aa966270449561fcea2e3d6747b8d23efaa9d7832"},
 ]
diff --git a/pyproject.toml b/pyproject.toml
index ea66bf7..f90ff08 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,14 +8,15 @@ packages = [
 ]
 
 [tool.poetry.dependencies]
-importlib-metadata = {version = "^1.0", python = "<3.8"}
-python = "^3.9"
+importlib-metadata = {version = "^0.23", python = "<3.8"}
+python = "^3.7"
 click = "^8.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2"
 coverage = {extras = ["toml"], version = "^6.2"}
 pytest-cov = "^3.0.0"
+pytest-mock = "^3.6.1"
 
 [tool.poetry.scripts]
 habitmove = "habitmove.cli:main"
diff --git a/src/habitmove/__init__.py b/src/habitmove/__init__.py
index 4ed1b57..fcbc880 100644
--- a/src/habitmove/__init__.py
+++ b/src/habitmove/__init__.py
@@ -1,9 +1,9 @@
 # init.py
 import sys
 
-if sys.version_info >= (3, 8):
+try:
     from importlib.metadata import version as metadata_version
-else:
+except ImportError:
     from importlib_metadata import version as metadata_version
 
 __version__ = str(metadata_version(__name__))
diff --git a/src/habitmove/habits.py b/src/habitmove/habits.py
index 0866380..a6d6f96 100644
--- a/src/habitmove/habits.py
+++ b/src/habitmove/habits.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import sqlite3
 
 from habitmove.nomiedata import Tracker
diff --git a/src/habitmove/nomiedata.py b/src/habitmove/nomiedata.py
index 9deab64..75a4189 100644
--- a/src/habitmove/nomiedata.py
+++ b/src/habitmove/nomiedata.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 from typing import Any, Union
 from dataclasses import dataclass, field
 import re
diff --git a/src/habitmove/repetitions.py b/src/habitmove/repetitions.py
index bfd21ba..0d1ffa9 100644
--- a/src/habitmove/repetitions.py
+++ b/src/habitmove/repetitions.py
@@ -1,3 +1,5 @@
+from __future__ import annotations
+
 import sqlite3
 from typing import Optional
 from datetime import datetime
@@ -92,7 +94,8 @@ def add_to_database(
                     (sql_id, repetition.timestamp, repetition.value),
                 )
             except sqlite3.IntegrityError:
-                # TODO better error handling
+                # FIXME better error handling
+                # TODO think about adapting this to allow importing into existing databases
                 print(
                     f"{sql_id}, {habit.name}: timestamp {datetime.fromtimestamp(repetition.timestamp/1000)} not unique, moving timestamp slightly."
                 )
diff --git a/src/habitmove/schema.py b/src/habitmove/schema.py
index e5e8404..c725648 100644
--- a/src/habitmove/schema.py
+++ b/src/habitmove/schema.py
@@ -1,7 +1,8 @@
 import sqlite3
+import sys
 
 
-def create_database(name):
+def create_database(db_file: str = ":memory:") -> sqlite3.Connection:
     """create a database connection to the SQLite database
         specified by db_file
     :param db_file: database file
@@ -9,16 +10,14 @@ def create_database(name):
     """
     conn = None
     try:
-        conn = sqlite3.connect(name)
+        conn = sqlite3.connect(db_file)
         return conn
     except sqlite3.Error as e:
         print(e)
-
-    return conn
+        sys.exit(1)
 
 
-def create_tables(db):
-    c = db.cursor()
+def create_tables(c: sqlite3.Cursor):
     c.execute(
         """ CREATE TABLE IF NOT EXISTS Habits (
                                         id integer PRIMARY KEY AUTOINCREMENT,
@@ -51,8 +50,7 @@ def create_tables(db):
     )
 
 
-def create_constraints(db):
-    c = db.cursor()
+def create_constraints(c: sqlite3.Cursor):
     c.execute(
         """ CREATE UNIQUE INDEX IF NOT EXISTS idx_repetitions_habit_timestamp 
             on Repetitions( habit, timestamp);
@@ -60,15 +58,15 @@ def create_constraints(db):
     )
 
 
-def create_pragma(db):
-    c = db.cursor()
+def create_pragma(c: sqlite3.Cursor):
     c.execute(""" PRAGMA user_version = 24; """)
     c.execute(""" PRAGMA schema_version = 30; """)
 
 
-def migrate(name):
-    db = create_database(name)
-    create_tables(db)
-    create_constraints(db)
-    create_pragma(db)
+def migrate(fname):
+    db = create_database(fname)
+    c = db.cursor()
+    create_tables(c)
+    create_constraints(c)
+    create_pragma(c)
     return db
diff --git a/tests/test_habits.py b/tests/test_habits.py
index a015a14..491d68e 100644
--- a/tests/test_habits.py
+++ b/tests/test_habits.py
@@ -37,8 +37,8 @@ def trackerlist():
 
 
 def test_simple_habit_transform_from_tracker(trackerlist):
-    sut = trackerlist[0]
-    assert habits.trackers_to_habits([sut]) == [
+    result = habits.trackers_to_habits([trackerlist[0]])
+    assert result == [
         loopdata.Habit(
             name="🧪 Testing",
             description="testtrack",
@@ -51,8 +51,8 @@ def test_simple_habit_transform_from_tracker(trackerlist):
 
 
 def test_range_habit_transform_from_tracker(trackerlist):
-    sut = trackerlist[1]
-    assert habits.trackers_to_habits([sut]) == [
+    result = habits.trackers_to_habits([trackerlist[1]])
+    assert result == [
         loopdata.Habit(
             name="🧪 Testing",
             description="testtrack",