Add pytest-cov (#1578)

* Add pytest-cov

Also added coverage report in .travis.yml file.

* updating DIRECTORY.md

* Sort by missing statements

* sort = Cover

.coveragerc

@@ -0,0 +1,4 @@
+[report]
+sort = Cover
+omit =
+    .env/*

.travis.yml

@@ -9,6 +9,6 @@ before_script:
 script:
   - scripts/validate_filenames.py  # no uppercase, no spaces, in a directory
   - mypy --ignore-missing-imports .
-  - pytest . --doctest-modules
+  - pytest --doctest-modules --cov-report=term-missing:skip-covered --cov=. .
 after_success:
   - scripts/build_directory_md.py 2>&1 | tee DIRECTORY.md

DIRECTORY.md

@@ -521,6 +521,7 @@
   * [Naive String Search](https://github.com/TheAlgorithms/Python/blob/master/strings/naive_string_search.py)
   * [Rabin Karp](https://github.com/TheAlgorithms/Python/blob/master/strings/rabin_karp.py)
   * [Remove Duplicate](https://github.com/TheAlgorithms/Python/blob/master/strings/remove_duplicate.py)
+  * [Word Occurence](https://github.com/TheAlgorithms/Python/blob/master/strings/word_occurence.py)
 
 ## Traversals
   * [Binary Tree Traversals](https://github.com/TheAlgorithms/Python/blob/master/traversals/binary_tree_traversals.py)

requirements.txt

@@ -9,6 +9,7 @@ opencv-python
 pandas
 pillow
 pytest
+pytest-cov
 requests
 scikit-fuzzy
 sklearn