Testing javascript

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This document introduces testing JavaScript code with Jasmine. It discusses that JavaScript should be tested like production code to allow changing, fixing, cleaning, and refactoring code without fear of breaking things. Tests should be fast, independent, repeatable, self-validating by passing or failing, and timely by writing tests before production code. An example is given of writing a failing test for a buggy random die rolling function, running the test to see it fail, fixing the bug, and adding more tests for documentation and confidence in changes.

How many times have you
changed something in JavaScript

Which means, we need to treat it
with respect

Testing is especially important when
external factors can affect how our
code functions

Independent

Tests should not depend on each
other.

Repeatable

Always the same results, regardless
of environment.

Self-Validating

Pass or Fail
No manual evalutation.

Timely

Write tests before production code.

Let’s look at an example.

A random function for rolling a die.

When you find yourself wanting
to do this.

Today's technical landscape features workloads that can no longer be accomplished on a single server using technology from years past. As a result, we must find new ways to accommodate the increasing demands on our compute performance. Some of these new strategies introduce trade-offs and additional complexity into a system. In this presentation, we give an overview of scaling and how to address performance concerns that business are facing, today.

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