diff --git a/tests/examples/setuptools/11-pyproject.toml b/tests/examples/setuptools/11-pyproject.toml
new file mode 100644
index 0000000..df3e156
--- /dev/null
+++ b/tests/examples/setuptools/11-pyproject.toml
@@ -0,0 +1,4 @@
+[tool.setuptools]
+ext-modules = [
+  {name = "my.ext", sources = ["hello.c", "world.c"]}
+]
diff --git a/tests/examples/setuptools/12-pyproject.toml b/tests/examples/setuptools/12-pyproject.toml
new file mode 100644
index 0000000..c7ad560
--- /dev/null
+++ b/tests/examples/setuptools/12-pyproject.toml
@@ -0,0 +1,3 @@
+[[tool.setuptools.ext-modules]]
+name = "my.ext"
+sources = ["hello.c", "world.c"]
diff --git a/tests/invalid-examples/setuptools/ext-modules/invalid-field.errors.txt b/tests/invalid-examples/setuptools/ext-modules/invalid-field.errors.txt
new file mode 100644
index 0000000..56887b3
--- /dev/null
+++ b/tests/invalid-examples/setuptools/ext-modules/invalid-field.errors.txt
@@ -0,0 +1 @@
+must not contain {'non-existing-field'}
diff --git a/tests/invalid-examples/setuptools/ext-modules/invalid-field.toml b/tests/invalid-examples/setuptools/ext-modules/invalid-field.toml
new file mode 100644
index 0000000..e8875ef
--- /dev/null
+++ b/tests/invalid-examples/setuptools/ext-modules/invalid-field.toml
@@ -0,0 +1,4 @@
+[[tool.setuptools.ext-modules]]
+name = "hello.world"
+sources = ["hello.c"]
+non-existing-field = "hello"
diff --git a/tests/invalid-examples/setuptools/ext-modules/invalid-sources.errors.txt b/tests/invalid-examples/setuptools/ext-modules/invalid-sources.errors.txt
new file mode 100644
index 0000000..48fba1a
--- /dev/null
+++ b/tests/invalid-examples/setuptools/ext-modules/invalid-sources.errors.txt
@@ -0,0 +1 @@
+must be array
diff --git a/tests/invalid-examples/setuptools/ext-modules/invalid-sources.toml b/tests/invalid-examples/setuptools/ext-modules/invalid-sources.toml
new file mode 100644
index 0000000..6cc1678
--- /dev/null
+++ b/tests/invalid-examples/setuptools/ext-modules/invalid-sources.toml
@@ -0,0 +1,3 @@
+[[tool.setuptools.ext-modules]]
+name = "hello.world"
+sources = "hello.c"
diff --git a/tests/invalid-examples/setuptools/ext-modules/missing-ext-name.errors.txt b/tests/invalid-examples/setuptools/ext-modules/missing-ext-name.errors.txt
new file mode 100644
index 0000000..625a290
--- /dev/null
+++ b/tests/invalid-examples/setuptools/ext-modules/missing-ext-name.errors.txt
@@ -0,0 +1 @@
+must contain ['name']
diff --git a/tests/invalid-examples/setuptools/ext-modules/missing-ext-name.toml b/tests/invalid-examples/setuptools/ext-modules/missing-ext-name.toml
new file mode 100644
index 0000000..83cab4a
--- /dev/null
+++ b/tests/invalid-examples/setuptools/ext-modules/missing-ext-name.toml
@@ -0,0 +1,2 @@
+[[tool.setuptools.ext-modules]]
+sources = ["hello.c", "world.c"]