DOC,MAINT: Build release notes during CircleCI step

For the moment, this requires te use for the development version
of towncrier.

1 files changed, 16 insertions, 0 deletions

diff --git a/tools/ci/test_all_newsfragments_used.py b/tools/ci/test_all_newsfragments_used.py
new file mode 100755
index 000000000..6c4591fd8
--- /dev/null
+++ b/tools/ci/test_all_newsfragments_used.py
@@ -0,0 +1,16 @@
+#!/usr/bin/env python
+
+import sys
+import toml
+import os
+
+path = toml.load("pyproject.toml")["tool"]["towncrier"]["directory"]
+
+fragments = os.listdir(path)
+fragments.remove("README.rst")
+fragments.remove("template.rst")
+
+if fragments:
+    print("The following files were not found by towncrier:")
+    print("    " + "    \n".join(fragments))
+    sys.exit(1)