diff --git a/.coveragerc b/.coveragerc
deleted file mode 100644
index 033a1ea9d..000000000
--- a/.coveragerc
+++ /dev/null
@@ -1,6 +0,0 @@
-[run]
-omit = 
-    */common/vendor/*
-    */tests/*
-    common/vendor/*
-    tests/*
diff --git a/CONTRIBUTE.md b/CONTRIBUTE.md
index 3e21af64d..dab274acb 100644
--- a/CONTRIBUTE.md
+++ b/CONTRIBUTE.md
@@ -54,3 +54,8 @@ If you're interested in tackling a bug, please say so and I can assign it to you
 # Documentation
 
 If you make changes, please remember to update the user documentation to reflect the new behavior.
+
+
+## Package Testing
+
+Check the implementation details of the [tests](docs/testing.md).
diff --git a/docs/testing.md b/docs/testing.md
new file mode 100644
index 000000000..11088e1c3
--- /dev/null
+++ b/docs/testing.md
@@ -0,0 +1,32 @@
+# Package Testing
+
+We try to cover the most crucial functionality with unit tests using
+[UnitTesting](https://github.com/randy3k/UnitTesting). To run the tests
+locally, you should install UnitTesting via Package Control.
+
+## Run the test specs locally
+
+First you need to [clone](https://github.com/divmain/GitSavvy#less-simple) GitSavvy repo from source.
+Open the directory `GitSavvy` and simply run the command `UnitTesting: Test Current Project`
+
+## Some details about DeferrableTestCase
+
+[DeferrableTestCase][1] is used to write the test cases. They are executed by
+the [DeferringTextTestRunner][2] and the runner expects not only regular test
+functions, but also generators. If the test function is a generator, it does
+the following
+
+- if the yielded object is a callable, the runner will evaluate the
+  [callable][3] and check its returned value. If the result is `True`, the
+  runner continues the generator, if not, the runner will wait until the
+  condition is met.
+
+- If the yielded object is an integer, say `x`, then it will [continue][4] the
+  generator after `x` ms.
+
+- Otherwise, the `yield` statement will always wait for 10 ms.
+  
+[1]: https://github.com/randy3k/UnitTesting/blob/dc810ee334bb031710b859478faaf50293880995/unittesting/core/st3/runner.py#L49
+[2]: https://github.com/randy3k/UnitTesting/blob/dc810ee334bb031710b859478faaf50293880995/unittesting/core/st3/runner.py#L7
+[3]: https://github.com/randy3k/UnitTesting/blob/dc810ee334bb031710b859478faaf50293880995/unittesting/core/st3/runner.py#L49
+[4]: https://github.com/randy3k/UnitTesting/blob/dc810ee334bb031710b859478faaf50293880995/unittesting/core/st3/runner.py#L57