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# Test Structure
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Hierarchical test organization system supporting both traditional and BDD naming conventions with nested module support for complex test suites.
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## Capabilities
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### Module Organization
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Groups related tests together with optional nesting for complex test organization.
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```scss { .api }
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/**
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 * Creates a test module for grouping related tests and sub-modules
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 * @param $name - Name of the test module
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 * @content Include tests and sub-modules within this module
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 */
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@mixin test-module($name);
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/**
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 * BDD-style alias for test-module
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 * @param $name - Name of the module/feature being described  
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 * @content Include tests and sub-modules within this describe block
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 */
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@mixin describe($name);
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```
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**Usage Examples:**
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```scss
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@use 'pkg:sass-true' as *;
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// Traditional syntax
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@include test-module('Math Utilities') {
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  @include test-module('Addition Functions') {
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    @include test('adds positive numbers') {
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      @include assert-equal(add(2, 3), 5);
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    }
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    @include test('adds negative numbers') {
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      @include assert-equal(add(-2, -3), -5);
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    }
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  }
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  @include test-module('Subtraction Functions') {
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    @include test('subtracts correctly') {
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      @include assert-equal(subtract(5, 3), 2);
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    }
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  }
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}
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// BDD syntax (equivalent)
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@include describe('Math Utilities') {
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  @include describe('Addition Functions') {
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    @include it('adds positive numbers') {
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      @include assert-equal(add(2, 3), 5);
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    }
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  }
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}
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```
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### Test Definition
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Defines individual test cases containing one or more assertions.
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```scss { .api }
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/**
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 * Creates a test case containing related assertions
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 * @param $name - Description of what is being tested
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 * @content Include assertions that validate the behavior being tested
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 */
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@mixin test($name);
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/**
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 * BDD-style alias for test
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 * @param $name - Description of the behavior being tested
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 * @content Include assertions that validate the expected behavior
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 */
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@mixin it($name);
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```
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**Usage Examples:**
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```scss
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@use 'pkg:sass-true' as *;
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@include test-module('String Functions') {
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  @include test('capitalizes first letter correctly') {
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    @include assert-equal(capitalize('hello'), 'Hello');
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    @include assert-equal(capitalize('WORLD'), 'WORLD');
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    @include assert-equal(capitalize(''), '');
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  }
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  @include test('handles edge cases') {
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    @include assert-equal(capitalize(null), null);
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    @include assert-equal(capitalize(123), 123);
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  }
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}
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// BDD equivalent
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@include describe('String Functions') {
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  @include it('capitalizes first letter correctly') {
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    @include assert-equal(capitalize('hello'), 'Hello');
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  }
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  @include it('handles edge cases') {
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    @include assert-equal(capitalize(null), null);
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  }
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}
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```
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### Nested Organization
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Modules can be nested to any depth for organizing complex test suites.
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```scss
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@use 'pkg:sass-true' as *;
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@include describe('Component Library') {
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  @include describe('Layout Components') {
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    @include describe('Grid System') {
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      @include describe('Grid Container') {
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        @include it('sets correct container width') {
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          @include assert-equal(grid-container-width(), 1200px);
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        }
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      }
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      @include describe('Grid Columns') {
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        @include it('calculates column width correctly') {
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          @include assert-equal(grid-column-width(12, 1200px), 100px);
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        }
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      }
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    }
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  }
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  @include describe('Typography Components') {
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    @include it('generates font sizes correctly') {
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      @include assert-equal(font-size('large'), 1.25rem);
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    }
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  }
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}
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```
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## Best Practices
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### Naming Conventions
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- **Module names**: Use descriptive names that group related functionality (e.g., "Math Functions", "Color Utilities")
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- **Test names**: Use action-oriented descriptions (e.g., "adds two numbers", "returns correct color value")
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- **BDD style**: Use natural language descriptions (e.g., "should add two numbers correctly")
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### Organization Patterns
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```scss
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// Group by function/feature
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@include describe('Button Mixin') {
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  @include it('generates base button styles') { /* ... */ }
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  @include it('handles size variants') { /* ... */ }
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  @include it('handles color themes') { /* ... */ }
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}
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// Group by use case
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@include describe('Responsive Typography') {
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  @include describe('Mobile Breakpoint') {
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    @include it('uses smaller font sizes') { /* ... */ }
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  }
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  @include describe('Desktop Breakpoint') {
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    @include it('uses larger font sizes') { /* ... */ }
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  }
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}
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```
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### Mixed Testing Approaches
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You can mix value assertions and CSS output testing within the same test structure:
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```scss
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@include describe('Button Mixin') {
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  @include it('calculates padding correctly') {
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    // Test function return value
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    @include assert-equal(button-padding('small'), 0.5rem 1rem);
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  }
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  @include it('generates correct CSS output') {
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    // Test CSS output
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    @include assert {
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      @include output {
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        @include button('primary', 'large');
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      }
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      @include expect {
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        padding: 1rem 2rem;
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        background-color: #007bff;
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        border: none;
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        border-radius: 0.25rem;
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      }
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    }
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  }
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}
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```