#1784 - added wrapper class

Added documentation

tests/lib/README.md

@@ -1 +1,42 @@
-Folder for libs and tooling for automatic testing.
+Automatic testing
+-----------------
+Folder for libs and tooling for automatic testing.
+
+- db_handler.py - class for preparation of test DB
+    - dumps DB(s) to BSON (mongodump)
+    - loads dump(s) to new DB (mongorestore)
+    - loads sql file(s) to DB (mongoimport)
+    - deletes test DB
+  
+- file_handler.py - class to download test data from GDrive
+    - downloads data from (list) of files from GDrive
+    - checks md5 if file ok
+    - unzips if zip
+    
+- testing_wrapper.py - base class to use for testing
+    - all env var necessary for running (OPENPYPE_MONGO ...)
+    - implements reusable fixtures to:
+        - load test data (uses `file_handler`)
+        - prepare DB (uses `db_handler`)
+        - modify temporarily env vars for testing
+        
+    Should be used as a skeleton to create new test cases.
+
+
+Test data
+---------
+Each class implementing `TestCase` can provide test file(s) by adding them to
+TEST_FILES ('GDRIVE_FILE_ID', 'ACTUAL_FILE_NAME', 'MD5HASH')
+
+GDRIVE_FILE_ID can be pulled from shareable link from Google Drive app.
+
+Currently it is expected that test file will be zip file with structure:
+- expected - expected files (not implemented yet)
+- input
+    - data - test data (workfiles, images etc)
+    - dumps - folder for BSOn dumps from (`mongodump`)
+    - env_vars 
+        env_vars.json - dictionary with environment variables {key:value}
+        
+    - sql - sql files to load with `mongoimport` (human readable)
+