Add tests for the examples to ensure they are working in principle

Signed-off-by: Holger Frydrych <holger.frydrych@tngtech.com>

Author: fholger

examples/spdx2_convert_to_spdx3.py

@@ -18,4 +18,4 @@
 # Convert original document to an SPDX3 payload
 spdx3_payload = bump_spdx_document(spdx2_document)
 # Write SPDX3 payload in json-ld format
-write_payload(spdx3_payload, "spdx2_to_3.json")
+write_payload(spdx3_payload, "spdx2_to_3")

tests/spdx/examples/test_examples.py

@@ -0,0 +1,43 @@
+#  SPDX-FileCopyrightText: 2023 spdx contributors
+#
+#  SPDX-License-Identifier: Apache-2.0
+import os.path
+import runpy
+
+import pytest
+
+
+@pytest.fixture
+def cleanup_output_files():
+    yield
+
+    files_to_delete = ["spdx2_to_3.jsonld", "my_spdx_document.spdx.json"]
+    for file in files_to_delete:
+        output_file = os.path.join(os.path.dirname(__file__), file)
+        if os.path.exists(output_file):
+            os.remove(output_file)
+
+
+def run_example(example_file: str):
+    file_path = os.path.join(os.path.dirname(__file__), "../../../examples/", example_file)
+    runpy.run_path(file_path)
+
+
+def test_spdx2_parse_file():
+    run_example("spdx2_parse_file.py")
+
+
+@pytest.mark.usefixtures('cleanup_output_files')
+def test_spdx2_convert_to_spdx3():
+    run_example("spdx2_convert_to_spdx3.py")
+
+    output_file = os.path.join(os.path.dirname(__file__), "spdx2_to_3.jsonld")
+    assert os.path.exists(output_file)
+
+
+@pytest.mark.usefixtures('cleanup_output_files')
+def test_spdx2_document_from_scratch():
+    run_example("spdx2_document_from_scratch.py")
+
+    output_file = os.path.join(os.path.dirname(__file__), "my_spdx_document.spdx.json")
+    assert os.path.exists(output_file)