diff --git a/.github/workflows/main.yaml b/.github/workflows/main.yaml
index 20d07d9c..36c8ab9d 100644
--- a/.github/workflows/main.yaml
+++ b/.github/workflows/main.yaml
@@ -1,6 +1,6 @@
 name: unitary
 
-on: ["push", "pull_request"]
+on: [ "push", "pull_request" ]
 
 env:
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.10", "3.11"]
+        python-version: [ "3.10", "3.11" ]
 
     name: "unit tests: python ${{ matrix.python-version }}"
 
@@ -29,7 +29,20 @@ jobs:
           pip install .
 
       - name: Run Unit Tests
-        run: pytest -n auto tests/unitary/
+        env:
+          PYTHONPATH: ${{ github.workspace }}
+          # pass internals to pytest-cov, since we are testing a pytest plugin.
+          # See https://github.com/pytest-dev/pytest-cov/blob/2c9f2170/docs/plugins.rst
+          COV_CORE_SOURCE: boa
+          COV_CORE_CONFIG: .coveragerc
+          COV_CORE_DATAFILE: .coverage.eager
+        run: >-
+          pytest
+          --cov=boa
+          --cov-append
+          --cov-report term-missing:skip-covered
+          --cov-fail-under=70
+          tests/unitary/
 
   integration:
     name: "integration tests (forked and networked modes)"
diff --git a/.gitignore b/.gitignore
index a9e99892..49357d74 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,4 @@ venv/
 *.env
 
 .coverage
+.coverage.*
diff --git a/boa/integrations/jupyter/utils.py b/boa/integrations/jupyter/utils.py
index 7180006b..c14622a3 100644
--- a/boa/integrations/jupyter/utils.py
+++ b/boa/integrations/jupyter/utils.py
@@ -1,7 +1,7 @@
 from os.path import dirname, join, realpath
 
 import requests
-from IPython.core.display import Javascript, display
+from IPython.display import Javascript, display
 
 from boa.integrations.jupyter.constants import ETHERS_JS_URL
 
diff --git a/dev-requirements.txt b/dev-requirements.txt
index c7f1c4c2..f3cf704d 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -10,4 +10,5 @@ mypy
 pre-commit
 pytest
 pytest-xdist
+pytest-cov
 sphinx-rtd-theme
diff --git a/pyproject.toml b/pyproject.toml
index 178d4059..f09f7cd0 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -22,6 +22,7 @@ dependencies = [
     "eth-typing",
     "hypothesis",
     "pytest",
+    "pytest-cov",
     "rich",
 
     # required for forking:
@@ -41,7 +42,11 @@ requires = ["setuptools", "wheel"]
 include = ["boa*"]
 
 [tool.pytest.ini_options]
-markers = ["ignore_isolation: Do not preserve state during tests"]
+markers = [
+    "ignore_isolation: Do not preserve state during tests",
+    "gas_profile: Enable gas profiling.",
+    "ignore_profiling: Disable gas profiling.",
+]
 
 [tool.setuptools.package-data]
 boa = ["integrations/**/*.js"]
diff --git a/tests/unitary/stateful/test_state_machine_isolation.py b/tests/unitary/stateful/test_state_machine_isolation.py
index d2d0dbf6..c79ce06a 100644
--- a/tests/unitary/stateful/test_state_machine_isolation.py
+++ b/tests/unitary/stateful/test_state_machine_isolation.py
@@ -52,6 +52,6 @@ def test_state_machine_isolation(boa_contract):
     StateMachine.contract = boa_contract
     StateMachine.settings = {
         "stateful_step_count": NUM_STEPS,
-        "suppress_health_check": HealthCheck.all(),
+        "suppress_health_check": list(HealthCheck),
     }
     run_state_machine_as_test(StateMachine)