create files to use in demo

presentaties/demo/run

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+#! /usr/bin/env sh
+
+python test.py

presentaties/demo/submission/correct/main.py

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+def sum(a, b):
+    return a + b

presentaties/demo/submission/wrong/main.py

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+def sum(a, b):
+    return a - b

presentaties/demo/test.py

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+import os
+from submission import main
+
+correct_path = os.environ["CORRECT"]
+failed_path = os.environ["FAILED"]
+failed_exit_code = int(os.environ["EXIT_TEST_FAILED"])
+
+test_cases = [
+    (0, 0, 0),
+    (1, 2, 3),
+    (3, 4, 7),
+    (5, 6, 11),
+    (7, 8, 15),
+    (9, 10, 19),
+    (11, 12, 23),
+    (13, 14, 27),
+    (15, 16, 31),
+    (17, 18, 35),
+    (19, 20, 39)
+]
+
+def run_tests():
+    has_failed = False
+    with open(correct_path, "w") as correct, open(failed_path, "w") as failed:
+        for test in test_cases:
+            a, b, expected = test
+            result = main.sum(a, b)
+            if result == expected:
+                correct.write(f"{a} {b} {expected}\n")
+            else:
+                failed.write(f"{a} {b} {expected}\n")
+                has_failed = True
+    if has_failed:
+        exit(failed_exit_code)
+
+if __name__ == "__main__":
+    run_tests()