Unit Testing

Focuses on testing individual units of code in isolation.

Instructions

When creating unit tests:

1. •

   Identify test cases

   • •Normal inputs and expected outputs
   • •Edge cases (empty, null, boundary values)
   • •Error conditions
2. •

   Write test structure

   rust

   #[test]
   fn test_function_name_scenario() {
       // Arrange
       let input = ...;
       
       // Act
       let result = function(input);
       
       // Assert
       assert_eq!(result, expected);
   }
   

3. •

   Best practices

   • •One assertion per test when possible
   • •Clear, descriptive test names
   • •Test behavior, not implementation

Examples

Input: Create unit tests for add function Output: Tests covering positive numbers, negative numbers, zeros, and overflow cases.