README.md in trackler-2.2.1.95

- old
+ new

@@ -1,11 +1,11 @@
 # Zipper
 
 Creating a zipper for a binary tree.
 
 [Zippers](https://en.wikipedia.org/wiki/Zipper_%28data_structure%29) are
-a way purely functional of navigating within a data structure and
+a purely functional way of navigating within a data structure and
 manipulating it.  They essentially contain a data structure and a
 pointer into that data structure (called the focus).
 
 For example given a rose tree (where each node contains a value and a
 list of child nodes) a zipper might support these operations:
@@ -25,31 +25,33 @@
   the `next` of the focus node, returns a new zipper)
 - `delete` (removes the focus node and all subtrees, focus moves to the
   `next` node if possible otherwise to the `prev` node if possible,
   otherwise to the parent node, returns a new zipper)
 
-  ## Setup
+## Setup
 
-  Go through the setup instructions for JavaScript to
-  install the necessary dependencies:
+Go through the setup instructions for JavaScript to install the
+ necessary dependencies:
 
-  http://exercism.io/languages/javascript/installation
+http://exercism.io/languages/javascript/installation
 
-  ## Making the Test Suite Pass
+## Running the test suite
 
-  Execute the tests with:
+The provided test suite uses [Jasmine](https://jasmine.github.io/).
+You can install it by opening a terminal window and running the
+following command:
 
-      jasmine <exercise-name>.spec.js
+```sh
+npm install -g jasmine
+```
 
-  Replace `<exercise-name>` with the name of the current exercise. E.g., to
-  test the Hello World exercise:
+Run the test suite from the exercise directory with:
 
-      jasmine hello-world.spec.js
+```sh
+jasmine zipper.spec.js
+```
 
-  All but the first test have been skipped.
+In many test suites all but the first test have been marked "pending".
+Once you get a test passing, activate the next one by changing `xit` to `it`.
 
-  Once you get a test passing, you can unskip the next one by
-  changing `xit` to `it`.
-
-
-  ## Submitting Incomplete Solutions
-  It's possible to submit an incomplete solution so you can see how others have completed the exercise.
+## Submitting Incomplete Solutions
+It's possible to submit an incomplete solution so you can see how others have completed the exercise.