add pytest test cases with real files

.coveragerc

@@ -0,0 +1,3 @@
+[run]
+source = exifread
+omit = tests/*, __init__.py

README.rst

@@ -204,6 +204,15 @@ This example shows how to use the library to correct the orientation of an image
         return im
 
 
+PyTest
+******
+for running PyTest, run `sh tests/start_tests.sh` in the projects root directory.
+This will run a few test cases with real files.
+The images are cropped to 10x10 pixels for the sage of the git repo.
+The RAW file is modified, so only the data with the exif tags are there.
+
+This can be used as reference during development, to ensure, that the lib still works after changes.
+
 License
 *******
 

pytest.ini

@@ -0,0 +1,3 @@
+[pytest]
+pythonpath = tests
+addopts = --ignore-glob=**/tests/**,

setup.py

@@ -8,6 +8,8 @@
     "pylint==2.14.4",
 ]
 
+# TODO: add testing before build/install
+
 setup(
     name="ExifRead",
     version=exifread.__version__,
@@ -34,6 +36,7 @@
         "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
+        "Programming Language :: Python :: 3.12",
         "Topic :: Utilities",
     ],
     extras_require={

tests/helpers/folder_helper.py

@@ -0,0 +1,25 @@
+import os
+import shutil
+from pathlib import Path
+
+TEST_FOLDER = '.test_folder'
+TEST_IMAGES = os.path.join('tests', 'test_files')
+
+
+def create_file(file):
+  Path(os.path.join(TEST_FOLDER, file)).touch()
+
+
+def delete_folder():
+  shutil.rmtree(TEST_FOLDER, ignore_errors=True)
+
+
+def copy_test_images(file:str):
+  delete_folder()
+  os.mkdir(TEST_FOLDER)
+  if file:
+      shutil.copy(src=os.path.join(TEST_IMAGES, file), dst=os.path.join(TEST_FOLDER, file))
+  else:
+    shutil.copy(src=os.path.join(TEST_IMAGES, os.path.sep), dst=TEST_FOLDER)
+
+

tests/start_tests.sh

@@ -0,0 +1,10 @@
+python3.12 -m pytest \
+ --no-header \
+ -rfp \
+ --cov \
+ --cov-report html:tests/coverage \
+ --cov-report xml:tests/coverage/coverage.xml \
+ --junitxml=tests/coverage/report.xml \
+ tests/
+
+exit $?

tests/test_images.py

@@ -0,0 +1,45 @@
+import unittest
+import sys
+import os
+
+
+sys.path.append('..')
+
+from exifread import process_file
+from helpers.folder_helper import copy_test_images
+from helpers.folder_helper import TEST_FOLDER
+from helpers.folder_helper import delete_folder
+
+
+class TestMobiles(unittest.TestCase):
+    def tearDown(self):
+        delete_folder()
+
+    def test_samsung(self):
+        copy_test_images(file='samsung_a54_001.jpg')
+        with open(file=os.path.join(TEST_FOLDER, 'samsung_a54_001.jpg'), mode='rb') as file: exif_tags = process_file(file)
+        make = next((exif_tags[tag] for tag in exif_tags.keys() if 'Make' in tag), None)
+        assert str(make) == 'samsung'
+
+    def test_apple(self):
+        copy_test_images(file='iphone_x_001.jpeg')
+        with open(file=os.path.join(TEST_FOLDER, 'iphone_x_001.jpeg'), mode='rb') as file: exif_tags = process_file(file)
+        make = next((exif_tags[tag] for tag in exif_tags.keys() if 'Make' in tag), None)
+        assert str(make) == 'Apple'
+
+
+class TestCameras(unittest.TestCase):
+    def tearDown(self):
+        delete_folder()
+
+    def test_sony_jpg(self):
+        copy_test_images(file='sony_alpha_a58.JPG')
+        with open(file=os.path.join(TEST_FOLDER, 'sony_alpha_a58.JPG'), mode='rb') as file: exif_tags = process_file(file)
+        make = next((exif_tags[tag] for tag in exif_tags.keys() if 'Make' in tag), None)
+        assert str(make) == 'SONY'
+
+    def test_sony_raw(self):
+        copy_test_images(file='sony_alpha_a7iii_raw_image.ARW')
+        with open(file=os.path.join(TEST_FOLDER, 'sony_alpha_a7iii_raw_image.ARW'), mode='rb') as file: exif_tags = process_file(file)
+        make = next((exif_tags[tag] for tag in exif_tags.keys() if 'Make' in tag), None)
+        assert str(make) == 'SONY'

tests/test_video.py

@@ -0,0 +1,24 @@
+import unittest
+import sys
+import os
+
+
+sys.path.append('..')
+
+from exifread import process_file
+from helpers.folder_helper import copy_test_images
+from helpers.folder_helper import TEST_FOLDER
+from helpers.folder_helper import delete_folder
+
+
+class TestVideos(unittest.TestCase):
+    def tearDown(self):
+        delete_folder()
+
+    # TODO: add a mp4 with exif tags
+    def test_video_mp4(self):
+        copy_test_images(file='test_video.mp4')
+        with open(file=os.path.join(TEST_FOLDER, 'test_video.mp4'), mode='rb') as file: exif_tags = process_file(file)
+        make = next((exif_tags[tag] for tag in exif_tags.keys() if 'Make' in tag), None)
+        assert make is None
+