diff --git a/pyproject.toml b/pyproject.toml
index 79848de..9aa1710 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -44,7 +44,7 @@ full = [
 dev = [
     "black",
     "build",
-    "coverage",
+    "coverage[toml]",
     "flake8",
     "mkdocs-material",
     "mkdocstrings[python]",
@@ -65,7 +65,10 @@ version = {attr = "PACKAGE_NAME_PLACEHOLDER.__version__"}
 # Mypy: #
 
 [tool.mypy]
-files = "src/"
+files = [
+    "src/",
+    "tests/",
+]
 warn_unused_configs = true
 strict = true
 show_error_codes = true
diff --git a/requirements/dev.txt b/requirements/dev.txt
index 538c836..2124456 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,7 +1,7 @@
 -r common.txt
 black
 build
-coverage
+coverage[toml]
 flake8
 mkdocs-material
 mkdocstrings[python]
diff --git a/scripts/lint.sh b/scripts/lint.sh
old mode 100644
new mode 100755
diff --git a/scripts/test.sh b/scripts/test.sh
old mode 100644
new mode 100755