diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..4c6d3e1
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,26 @@
+[run]
+source = vspace
+omit =
+    */tests/*
+    */test_*
+    */__pycache__/*
+    */vspace_version.py
+concurrency = multiprocessing
+parallel = True
+sigterm = True
+
+[report]
+precision = 2
+show_missing = True
+skip_covered = False
+
+exclude_lines =
+    pragma: no cover
+    def __repr__
+    raise AssertionError
+    raise NotImplementedError
+    if __name__ == .__main__.:
+    @abstract
+
+[html]
+directory = htmlcov
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 4456c28..232761b 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -47,11 +47,28 @@ jobs:
           echo "Running single unit test as diagnostic..."
           python -m pytest tests/Vspace_Explicit/test_vspace_explicit.py -v -s
 
+      - name: Enable subprocess coverage
+        run: |
+          # Install coverage subprocess support
+          echo "import coverage; coverage.process_startup()" > $(python -c "import site; print(site.getsitepackages()[0])")/coverage_subprocess.pth
+          # Set environment variable for coverage configuration
+          echo "COVERAGE_PROCESS_START=${{ github.workspace }}/.coveragerc" >> $GITHUB_ENV
+
       - name: Run tests
         timeout-minutes: 20
         run: |
           # Run all tests with verbose output, capture disabled to see subprocess output, and per-test timeout
-          python -m pytest tests/ -v -s --timeout=300 --junitxml=junit/test-results-${{ matrix.os }}-${{ matrix.python-version }}.xml --cov=vspace --cov-report=xml --cov-report=term
+          python -m pytest tests/ -v -s --timeout=300 --junitxml=junit/test-results-${{ matrix.os }}-${{ matrix.python-version }}.xml --cov --cov-report=xml --cov-report=term
+
+      - name: Combine coverage data
+        if: matrix.os == 'ubuntu-22.04' && matrix.python-version == '3.9'
+        run: |
+          # Move all coverage files from subdirectories to repository root
+          find tests/ -name ".coverage.*" -type f -exec mv {} . \; 2>/dev/null || true
+          # Combine all coverage data files
+          python -m coverage combine
+          python -m coverage xml
+          python -m coverage report
 
       - name: Upload coverage to Codecov
         # Only upload from one runner to avoid redundant API calls
diff --git a/docs/conf.py b/docs/conf.py
index 5b5c0ea..9336e92 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -13,8 +13,6 @@
 import os
 import sys
 sys.path.insert(0, os.path.abspath('.'))
-sys.path.insert(0, os.path.abspath('sphinx_rtd_theme'))
-import sphinx_rtd_theme
 
 
 # -- Project information -----------------------------------------------------
@@ -50,7 +48,6 @@
 # a list of builtin themes.
 #
 html_theme = 'sphinx_rtd_theme'
-html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 # Add any paths that contain custom static files (such as style sheets) here,
 # relative to this directory. They are copied after the builtin static files,
diff --git a/pytest.ini b/pytest.ini
new file mode 100644
index 0000000..84291a5
--- /dev/null
+++ b/pytest.ini
@@ -0,0 +1,49 @@
+[pytest]
+# Pytest configuration for vspace
+
+# Test discovery patterns
+python_files = test_*.py
+python_classes = Test*
+python_functions = test_*
+
+# Test options
+addopts =
+    --verbose
+    --strict-markers
+    --cov-context=test
+
+# Coverage configuration for subprocess tracking
+[coverage:run]
+source = vspace
+omit =
+    */tests/*
+    */test_*
+    */__pycache__/*
+    */vspace_version.py
+concurrency = multiprocessing
+parallel = True
+
+[coverage:report]
+precision = 2
+show_missing = True
+skip_covered = False
+
+exclude_lines =
+    # Have to re-enable the standard pragma
+    pragma: no cover
+
+    # Don't complain about missing debug-only code
+    def __repr__
+
+    # Don't complain if tests don't hit defensive assertion code
+    raise AssertionError
+    raise NotImplementedError
+
+    # Don't complain if non-runnable code isn't run
+    if __name__ == .__main__.:
+
+    # Don't complain about abstract methods
+    @abstract
+
+[coverage:html]
+directory = htmlcov