add script to test all examples

Makefile

@@ -24,13 +24,17 @@ reinstall: uninstall install
 
 reinstall-editable: uninstall install-editable
 
+test-examples:
+	cd tests; \
+		python _test_examples.py
+
 tox-test:
 	tox -- -x -p no:warnings -rfEX tests/ \
 
 py-test:
 	python -m pytest -x -p no:warnings tests/; \
 
-test:  py-test tox-test
+test:  py-test test-examples
 
 requirement:
 	cd requirements/; \

tests/_test_examples.py

@@ -0,0 +1,24 @@
+import os, sys, glob
+import subprocess
+from subprocess import DEVNULL, STDOUT
+
+here = os.path.dirname(os.path.abspath(__file__))
+
+files0 = glob.glob(here+"/../examples/*/*.py")
+files1 = glob.glob(here+"/../examples/*.py")
+
+files = files0 + files1
+
+print("run files:", files)
+
+for file_path in files:
+    file_name = str(file_path.rsplit("/", maxsplit=1)[1])
+
+    try:
+        print("\033[0;33;40m Testing", file_name, end="...\r")
+        subprocess.check_call(["python", file_path], stdout=DEVNULL, stderr=STDOUT)
+    except subprocess.CalledProcessError:
+        print("\033[0;31;40m Error in", file_name)
+    else:
+        print("\033[0;32;40m", file_name, "is correct")
+print("\n")