Author: ytianle

Test

Types of Tests

There are four major types of tests. You can see their relations in the diagram below:

Definitions

Unit testsIntegration testsSystem testsE2E testsManual tests

• Formula: \(A\)
• Explanation: test the function of the smallest functional unit A. Each unit is independent.
• Note: Code coverage: for quantity, measure how much of the original code has been tested.

• Formula: \(A\supset B\) or \(A\rightarrow B\)
• Explanation: test the function of the parent function A including B.
• Note: Test A individually needs dependency injection. Test B individually can just use unit test.

• Formula: \(A\supset B + C\)
• Explanation: test object: Some system function from frontend C to backend A.
• Note: The system test is the same as UI test, which focuses on some system functions.

• Formula: \(U_{Frontend} + U_{Backend}\)
• Explanation: End to end tests. From frontend to backend for all the system functions.
• Note: One specific E2E test or a few E2E tests specific to some feature is classified into system tests.

• Formula: \(\forall \{A|A\in U_{Frontend}\} + \{C|C\in U_{Backend}\}\)
• Explanation: manual and arbitrary tests from customers or maintainers.

Syntax of Tests

Tests syntax

1. Given: setup & assumptions
2. When: thing that actually be tested
3. Then: assertions (what do you expect)

Reference

• Picture Resource 1