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Provide more details for sucessfull running of unittests.

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unittest/README.md
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Unit Testing for Tesseract
----------
# Unit Testing for Tesseract
## Requirements
### Files and structure
```
├── langdata_lstm
│   ├── common.punc
│   ├── common.unicharambigs
│   ├── desired_bigrams.txt
│   ├── eng
│   │   ├── desired_characters
│   │   ├── eng.config
│   │   ├── eng.numbers
│   │   ├── eng.punc
│   │   ├── eng.singles_text
│   │   ├── eng.training_text
│   │   ├── eng.unicharambigs
│   │   ├── eng.wordlist
│   │   └── okfonts.txt
│   ├── extended
│   │   └── extended.config
│   ├── extendedhin
│   │   └── extendedhin.config
│   ├── font_properties
│   ├── forbidden_characters_default
│   ├── hin
│   │   ├── hin.config
│   │   ├── hin.numbers
│   │   ├── hin.punc
│   │   └── hin.wordlist
│   ├── kan
│   │   └── kan.config
│   ├── kor
│   │   └── kor.config
│   ├── osd
│   │   └── osd.unicharset
│   └── radical-stroke.txt
├── tessdata
│   ├── ara.traineddata
│   ├── chi_tra.traineddata
│   ├── eng.traineddata
│   ├── heb.traineddata
│   ├── hin.traineddata
│   ├── jpn.traineddata
│   ├── kmr.traineddata
│   ├── osd.traineddata
│   └── vie.traineddata
├── tessdata_best
│   ├── eng.traineddata
│   ├── fra.traineddata
│   ├── kmr.traineddata
│   └── osd.traineddata
├── tessdata_fast
│   ├── eng.traineddata
│   ├── kmr.traineddata
│   ├── osd.traineddata
│   └── script
│   └── Latin.traineddata
└── tesseract
├── abseil
...
├── test
├── unittest
└── VERSION
```
### Fonts
* Microsoft fonts: arialbi.ttf, times.ttf, verdana.ttf - [instalation guide](https://www.makeuseof.com/tag/how-to-install-microsoft-core-fonts-in-ubuntu-linux/)
* [ae_Arab.ttf](https://www.wfonts.com/download/data/2014/12/03/ae-arab/ae-arab.zip)
* dejavu-fonts: [DejaVuSans-ExtraLight.ttf](https://dejavu-fonts.github.io/Download.html)
* [Lohit-Hindi.ttf](https://raw.githubusercontent.com/pratul/packageofpractices/master/assets/fonts/Lohit-Hindi.ttf)
* [UnBatang.ttf](https://raw.githubusercontent.com/byrongibson/fonts/master/backup/truetype.original/unfonts-core/UnBatang.ttf)
## Run tests
To run the tests, do the following in tesseract folder