The document discusses test-driven development principles for software engineering projects. It mentions the red-green-refactor cycle and outlines the arrange-act-assert structure for writing tests. The main rules are to get code from red to green quickly with no new code without tests, and to start each new test by writing the assertion.

1. RED
GREEN
REFACTOR
RED
GREEN
REFACTOR
Ping-pong pairingTest structure
Arrange
Act
Assert
Given
When
Then
aka
Rules
1. Get from RED to GREEN as quickly as possible
2. Write no product code without a RED test
3. Start each new test by writing the ASSERT
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