cleared up files folder

Author: russellrosario

content/backend/node.md

@@ -36,7 +36,6 @@ script = 'animation'
   <dt>NPM Scripts</dt>
   <dd>Npm has a run command that can run scripts defined in the scripts property of a package.json file. It provides additional commands to the CLI, such as <mark>npm run test</mark>. This functionality reduces the need for third-party tooling like Grunt or Gulp. </dd><br/>
   <dd>You can add even more functionality to NPM scripts by installing open source dev dependencies. npm-run-all can run scripts in parallel (usually multiple tasks are run in sequence with &&). onchange will automatically re-run the task by watching for changes in your code.</dd>
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  </div>
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content/devops/testing.md

@@ -46,3 +46,27 @@ script = 'animation'
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+### Whenever possible, use TDD
+
+TDD is a _design process_, not a testing process. TDD is a robust way of designing software components ("units") interactively so that their behaviour is specified through unit tests.
+
+How? Why?
+
+#### Test-first cycle
+
+1. Write a simple failing test
+2. Make the test pass by writing the minimum amount of code
+3. Refactor the code by applying design principles/patterns
+
+During phase 2, don't bother with quality.
+
+#### Consequences of the test-first cycle
+
++ Writing a test first makes the code design more testable
++ Writing just the amount of code needed to implement the required functionality makes the resulting codebase minimal, thus more maintainable
++ The codebase can be enhanced using refactoring mechanisms, the tests give you confidence that the new code is not modifying the existing functionalities
++ Cleaning the code in each cycle makes the codebase more maintainable, it is much cheaper to change the code frequently and in small increments
++ Fast feedback for the developers, you know that you don't break anything and that you are evolving the system in a good direction
++ Generates confidence to add features, fix bugs, or explore new designs
+
+Note that code written without a test-first approach is often very hard to test!

content/files/ai.md

@@ -1,7 +1,6 @@
 +++
-description = ""
+description = "Resources on AI"
 title = "Artificial Intelligence"
-
 draft = false
 weight = 200
 bref="A curated list of Artificial Intelligence (AI) courses, books, video lectures and papers"