Add info about testing

Former-commit-id: ce0ee9c005

tests/testing.md

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+
+## opendm/
+### config.py
+* test each parameter (min, max, out of bounds, etc.)
+
+### context.py
+* Each path must be a valid, existing path
+
+### io.py
+* check each function with a known string
+
+### system.py
+* (Get_ccd_widths is depreciated)
+* parse_coordinate_system:
+  * This is also old code - new one is in types
+
+### types.py
+* ODM_Photos
+  * updated focal equal to known focal length
+  * updated ccd equal to known ccd
+* ODM_Georef
+  * calculate_epsg needs to be updated, see master
+  * convert_to_las: assert existence of las file output
+  * utm_to_latlon:
+    * 
+    * 
+
+## scripts/
+### dataset.py
+* test that supported_extensions works with a variety of file names, even bogus ones
+* check outputs are all the photos
+
+### resize.py
+* resulting images are the right size 
+* metadata has been properly updated
+
+### OpenSfM.py
+* config file is contains info same as params
+* when matcher_distance > 0 it is written to the config
+* at least one reconstruction file is generated
+* check that bundler file is exported (possible to check if valid?)
+
+### CMVS.py
+* validate params
+* system.run() command is equal to some known string
+
+### PMVS.py
+* validate params
+* system.run() command is equal to some known string
+
+### odm_meshing.py
+* validate params
+* system.run() command is equal to some known string
+
+### odm_texturing.py
+* validate params
+* system.run() command is equal to some known string
+
+### odm_georeferencing.py
+* validate params
+* system.run() command is equal to some known string when using EXIF coords
+* system.run() when using GCP
+
+### odm_orthophoto.py
+* validate params
+* system.run() command is equal to some known string