Ignore conftest.py in code coverage

In addition, make it easier for produce coverage report locally by
adding pytest config options to pyproject.toml. This also produces
consistent results between local runs and runs in CI, and adds a
term-missing report for human readability, both for local runs as well
as in CI, so it show up in the logs.

Fixes #387

.coveragerc

@@ -0,0 +1,3 @@
+[run]
+omit =
+    virtualizarr/tests/*

.github/codecov.yml

@@ -3,7 +3,8 @@ coverage:
     project:
       default:
         target: 75
-        threshold: 0.1
+        # See https://json.schemastore.org/codecov.json
+        threshold: "0.1%"
     patch:
       default:
         target: 75

.github/workflows/main.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Running Tests
         run: |
-          python -m pytest ./virtualizarr --run-network-tests --cov=./ --cov-report=xml --verbose
+          python -m pytest --run-network-tests --cov-report=xml --verbose virtualizarr
 
       - name: Upload code coverage to Codecov
         uses: codecov/[email protected]

.github/workflows/min-deps.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Running Tests
         run: |
-          python -m pytest ./virtualizarr --cov=./ --cov-report=xml --verbose
+          python -m pytest --cov-report=xml --verbose virtualizarr
 
       - name: Upload code coverage to Codecov
         uses: codecov/[email protected]

.github/workflows/upstream.yml

@@ -51,7 +51,7 @@ jobs:
 
       - name: Running Tests
         run: |
-          python -m pytest ./virtualizarr --cov=./ --cov-report=xml --verbose
+          python -m pytest --cov-report=xml --verbose virtualizarr
 
       - name: Upload code coverage to Codecov
         uses: codecov/[email protected]

docs/contributing.md

@@ -12,10 +12,10 @@ mamba activate virtualizarr-tests
 pre-commit install
 # git checkout -b new-feature
 python -m pip install -e . --no-deps
-python -m pytest ./virtualizarr --run-network-tests --cov=./ --cov-report=xml --verbose
+python -m pytest --run-network-tests
 ```
 
-The `--run-network-tests` argument is optional - it will run additional tests that require downloading files over the network. Skip this if you want the tests to run faster or you have no internet access.
+The `--run-network-tests` argument is optional -- it will run additional tests that require downloading files over the network. Skip this if you want the tests to run faster or you have no internet access.
 
 ## Contributing documentation
 

pyproject.toml

@@ -149,6 +149,10 @@ line-ending = "auto"
 known-first-party = ["virtualizarr"]
 
 [tool.pytest.ini_options]
+addopts = [
+    "--cov=virtualizarr",
+    "--cov-report=term-missing",
+]
 markers = [
     "network: marks test requiring internet (select with '--run-network-tests')",
 ]