README.md in trackler-2.2.1.172

- old
+ new

@@ -51,16 +51,36 @@
 
 ```bash
 $ cargo test
 ```
 
-All but the first test have been ignored.  After you get the first test to
-pass, remove the ignore flag (`#[ignore]`) from the next test and get the tests
-to pass again.  The test file is located in the `tests` directory.   You can
-also remove the ignore flag from all the tests to get them to run all at once
-if you wish.
+All but the first test have been ignored. After you get the first test to
+pass, open the tests source file wich is located in the `tests` directory
+and remove the `#[ignore]` flag from the next test and get the tests to pass
+again. Each separate test is a function with `#[test]` flag above it.
+Continue, until you pass every test. 
 
+If you wish to run all tests without editing the tests source file, use:
+
+```bash
+$ cargo test -- --ignored
+```
+
+To run a specific test, for example `some_test`, you can use:
+
+```bash
+$ cargo test some_test
+```
+
+If the specfic test is ignored use:
+
+```bash
+$ cargo test some_test -- --ignored
+```
+
+To learn more about Rust tests refer to the [online test documentation][rust-tests]
+
 Make sure to read the [Modules](https://doc.rust-lang.org/book/second-edition/ch07-00-modules.html) chapter if you
 haven't already, it will help you with organizing your files.
 
 ## Feedback, Issues, Pull Requests
 
@@ -69,9 +89,10 @@
 If you want to know more about Exercism, take a look at the [contribution guide](https://github.com/exercism/docs/blob/master/contributing-to-language-tracks/README.md).
 
 [help-page]: http://exercism.io/languages/rust
 [modules]: https://doc.rust-lang.org/book/second-edition/ch07-00-modules.html
 [cargo]: https://doc.rust-lang.org/book/second-edition/ch14-00-more-about-cargo.html
+[rust-tests]: https://doc.rust-lang.org/book/second-edition/ch11-02-running-tests.html
 
 ## Source
 
 Converting a string into a number and some basic processing utilizing a relatable real world example. [https://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-10_check_digit_calculation](https://en.wikipedia.org/wiki/International_Standard_Book_Number#ISBN-10_check_digit_calculation)
 