diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index f63a590..e7cd87f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -22,16 +22,14 @@ jobs:
       name: Configure pip caching
       with:
         path: ~/.cache/pip
-        key: ${{ runner.os }}-pip-${{ hashFiles('**/setup.py') }}
-        restore-keys: |
-          ${{ runner.os }}-pip-
+        key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt')}}-${{ hashFiles('**/requirements-dev.txt') }}
     - name: Install Python dependencies
-      run: |
-        python -m pip install -r requirements.txt
-        python -m pip install -r requirements-dev.txt
-        python -m pip install -e .
+      run: make venv
+    - name: Validate against psf/black
+      run: make check-black
+    - name: Validate against flake8
+      run: make check-flake
     - name: Run tests
-      run: |-
-        pytest --cov=pdfplumber --cov-config=.coveragerc --cov-report xml:coverage.xml --cov-report term
-    - name: Codecov
+      run: make tests
+    - name: Examine code coverage
       uses: codecov/codecov-action@v1.0.12
diff --git a/Makefile b/Makefile
index d97f20d..260f74e 100644
--- a/Makefile
+++ b/Makefile
@@ -1,18 +1,22 @@
-.PHONY: venv tests
-PYTHON=venv/bin/python
-PIP=venv/bin/pip
+.PHONY: venv tests check-black check-flake format
+PYTHON := venv/bin/python
+PIP = venv/bin/pip
 
 venv:
 	python -m venv venv
 	${PIP} install --upgrade pip
-	${PIP} freeze --exclude-editable | xargs ${PIP} uninstall -y | true
 	${PIP} install -r requirements.txt
 	${PIP} install -r requirements-dev.txt
 	${PIP} install -e .
 
 tests:
-	${PYTHON} -m pytest --cov=pdfplumber --cov-config=.coveragerc --cov-report xml:coverage.xml --cov-report term
+	${PYTHON} -m pytest
+
+check-black:
+	${PYTHON} -m black pdfplumber --check
+
+check-flake:
+	${PYTHON} -m flake8 pdfplumber
 
 format:
 	${PYTHON} -m black pdfplumber
-	${PYTHON} -m flake8 pdfplumber
diff --git a/setup.cfg b/setup.cfg
index fc01c0d..ced6133 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,9 +1,13 @@
 [flake8]
+# max-complexity = 10
 max-line-length = 88
 ignore = 
     E203 # https://black.readthedocs.io/en/stable/the_black_code_style.html#slices
     W503 # Impossible to obey both W503 and W504
 
+[tool:pytest]
+addopts=--cov=pdfplumber --cov-report xml:coverage.xml --cov-report term
+
 [tox]
 envlist = py35,py36,py37,py38
 toxworkdir={env:TOX_WORK_DIR:.tox}