⚡️ VUT — Vlang Validation Utilities & Unit Testing Framework

VUT is a next-generation all-in-one framework for data validation, assertion, and unit testing in Vlang.
Inspired by the best of Zod, Jest, PestPHP, and Laravel Validation, it brings a modern, elegant, and powerful developer experience — all in native V 🚀

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✨ Features

• 🧠 Validation Engine — Type-safe, chainable, expressive (string().email().min(3))
• ⚖️ Unit Testing — describe, it, test.each, expect & matchers
• 🌈 Rich Reporters — Console, JSON & TAP with beautiful colors and emojis
• 🧩 Schema-based Validation — Compose complex structures like Zod or Vine
• 🧪 Spies & Mocks — Observe function calls, arguments & results
• 🚦 Tree View — Hierarchical test runner with ✅ ❌ ⚪ indicators
• 🔄 Async & Timeout support (future-proof for coroutines)

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📦 Installation

Via VPM (recommended)

v install siguici.vut

Via Git

mkdir -p ${VMODULES:-$HOME/.vmodules}/siguici
git clone --depth=1 https://github.com/siguici/vut ${VMODULES:-$HOME/.vmodules}/siguici/vut

As a project dependency

Module {
    dependencies: [
        'siguici.vut'
    ]
}

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🚀 Quick Start

🧹 Filtering (runtime type helpers)

import vut { filter }

assert filter(true).is_bool()
assert filter(true).is_true()
assert filter(2).is_any_int()
assert filter(5.4).is_any_float()
assert filter(8).is_num() // int or float

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🛡 Assurance (chained assertions)

import vut { ensure }

t := true

ensure(t).is_bool().is_true()

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🔍 Expectations (unit testing style)

import vut { expect }

t := true

expect(t).to_be_bool().to_be_true()

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🧠 Validation Engine (Vest)

import vut { string, number, boolean }

name_schema := string().required().min(3).max(50)
email_schema := string().email()
age_schema := number().integer().min(18)
consent_schema := boolean()

// ✅ Validate values
name := 'John Doe'
email := '[email protected]'
age := 25
consent := true

println(name_schema.validate(name, 'name')) // -> ok: true
println(email_schema.validate(email, 'email'))
println(age_schema.validate(age, 'age'))
println(consent_schema.validate(consent, 'consent'))

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🧩 Complex Schemas

import vut { Schema, string, number }

struct User {
    name  string
    email string
    age   int
}

user_schema := Schema[User]{
    fields: {
        'name':  string().min(3).max(50)
        'email': string().email()
        'age':   number().integer().min(18)
    }
}

result := user_schema.validate({
    name: 'Alice',
    email: '[email protected]',
    age: 22
})

if result.ok {
    println('✅ Validation passed!')
} else {
    for err in result.errors {
        println('❌ ${err.path}: ${err.message}')
    }
}

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🧪 Testing Suite (VUTest)

Example: describe / it / expect syntax

import vut { describe, it, expect }

describe('Math utilities 🌳') {
    it('adds numbers correctly') {
        expect(2 + 2).to_equal(4)
    }

    it('handles floats precisely') {
        expect(0.1 + 0.2).to_be_close_to(0.3, 0.001)
    }

    it('is skipped for now').skip()
    it('is planned later').todo()
}

Nested Groups

describe('User module') {
    describe('Validation') {
        it('accepts valid email') {
            expect('[email protected]').to_match(r'.+@.+')
        }
    }

    describe('Authentication') {
        it('should login successfully') {
            expect(true).to_be_true()
        }
    }
}

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🧰 Advanced Matchers

Matcher	Description
.to_equal(expected)	Deep equality check
.to_be_true() / .to_be_false()	Boolean checks
.to_be_greater_than(n) / .to_be_less_than(n)	Numeric comparison
.to_contain(sub)	String / Array containment
.to_match(regex)	Regex pattern match
.to_throw()	Expects a panic or error
.to_be_close_to(value, delta)	Floating-point precision match
.to_pass(schema)	Passes validation schema

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🕵️ Spies & Mocks

import vut { spy }

mut fn add(a int, b int) int {
    return a + b
}

mut s := spy(add)

s.call(2, 3)
s.call(1, 4)

expect(s.call_count).to_equal(2)
expect(s.called_with(1, 4)).to_be_true()
expect(s.returned(5)).to_be_true()

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🔄 Parameterized Tests (test.each)

import vut { test }

test.each([
    [2, 3, 5],
    [10, 5, 15],
])('adds numbers correctly') { a, b, expected ->
    expect(a + b).to_equal(expected)
}

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🧾 Reporters

VUT supports multiple output styles for your tests and CI pipelines:

Reporter	Description
🖥 Console	Pretty tree view with colors & emojis
📄 JSON	Structured JSON for CI tools
🧱 TAP	Test Anything Protocol output

Example output in console:

🌳 VUT Test Suite
├── User module
│   ├── Validation
│   │   ✅ accepts valid email
│   └── Authentication
│       ⚪ should login successfully (skipped)
└── Math utilities
    ❌ adds numbers correctly
    🟡 is planned later (todo)

Summary: ✅ 3 passed | ❌ 1 failed | ⚪ 1 skipped | 🟡 1 todo

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🚦 Status Indicators

Symbol	Meaning
✅	Passed
❌	Failed
⚪	Skipped
🟡	Todo

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🧠 Philosophy

VUT = Validation + Utility + Test

A single framework that unifies validation and unit testing with the same philosophy:

• Intuitive
• Fluent
• Expressive
• Fully native to V

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🧩 Roadmap

• Async test support
• File-based test discovery
• Plugin system (custom matchers & reporters)
• Schema-based transformations
• Integration with v fmt and v test

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🪪 License

MIT © Sigui Kessé Emmanuel

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💬 Connect

• 🐙 GitHub: github.com/siguici/vut
• 💬 Discussions: GitHub Discussions
• 💡 Issues & Suggestions: Submit an Issue

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Made with ❤️ by Sigui Kessé Emmanuel For the next generation of Vlang developers ⚙️🚀