diff --git a/.coveragerc b/.coveragerc
new file mode 100644
index 0000000..199c083
--- /dev/null
+++ b/.coveragerc
@@ -0,0 +1,2 @@
+[run]
+source = zx
diff --git a/.gitignore b/.gitignore
index fe6ac8a..2c633bc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,5 @@
 build
 dist
 venv
+.venv
+.coverage
diff --git a/pytest.ini b/pytest.ini
index 75d12c7..09944f9 100644
--- a/pytest.ini
+++ b/pytest.ini
@@ -1,3 +1,7 @@
 [pytest]
+addopts = -s --cov -p no:warnings
 testpaths =
   tests
+
+filterwarnings =
+  ignore::CoverageWarning
diff --git a/setup.cfg b/setup.cfg
index b47bc48..a998db6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -32,5 +32,6 @@ console_scripts =
 [options.extras_require]
 dev =
     pytest
+    pytest-cov
     tox
     mypy