In the penultimate session from Blanca’s PD1 course, we cover:

• Describe the testing framework and requirements for deployment.
• Describe how to write unit tests for triggers, controllers, and classes.  
• Describe when and how to use various sources of test data.
• Describe how to execute one or multiple test classes.
• Describe the differences between invoking Apex in
  execute anonymous vs. unit tests.