VerbytesAssertions

VerbytesAssertions is a modern, developer-friendly assertion library for .NET applications. Inspired by FluentAssertions, it provides a highly expressive, intuitive, and readable syntax for asserting the behavior and state of objects, methods, and systems during automated testing. Compatible with xUnit, NUnit, or MSTest, VerbytesAssertions simplifies and enhances your testing process.

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Features

• Fluent Syntax: Chainable, human-readable assertions.
• Wide Assertion Coverage: Support for booleans, strings, enums, collections, and more.
• Custom Extensions: Easily extend the library with your own assertion types.
• Detailed Error Messages: Clear and detailed feedback for failed tests.
• Lightweight & Dependency-Free: No external libraries required.
• Seamless Integration: Works out of the box with popular test frameworks like xUnit, NUnit, and MSTest.

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Project Structure

The project is structured into the following components:

• Primitives/: Core assertions for primitive types like booleans, strings, enums, etc.
• Extensions/: Fluent extensions for enabling .Should() syntax.
• Exceptions/: Custom exception types for better error messages.
• Properties/: Reserved for project-level properties or shared configurations.
• Others/: For now, it is just including NullableAssertions.

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Installation

To include VerbytesAssertions in your project, copy the library's source files into your solution.

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Usage

Boolean Assertions

bool value = true;

// Check if the value is true
value.Should().BeTrue();

// Check if the value is false
value.Should().BeFalse();

// Check if the value matches the expected
value.Should().Be(true);

// Ensure the value is not equal to the unexpected
value.Should().NotBe(false);

String Assertions

string text = "Hello, World!";

// Check for equality
text.Should().Be("Hello, World!");

// Check for inequality
text.Should().NotBe("Goodbye");

// Check if it contains a substring
text.Should().Contain("World");

// Check if it starts or ends with specific text
text.Should().StartWith("Hello");
text.Should().EndWith("!");

// Check if it matches a regex
text.Should().MatchRegex(@"[A-Za-z, ]+!");

Enum Assertions

public enum MyEnum
{
    Value1 = 1,
    Value2 = 2,
    Value3 = 4
}

MyEnum myEnum = MyEnum.Value1;

// Check for equality
myEnum.Should().Be(MyEnum.Value1);

// Check for inequality
myEnum.Should().NotBe(MyEnum.Value2);

// Check if the enum value is defined in the enum type
myEnum.Should().BeDefined();

// Check if the enum has a specific flag
myEnum.Should().HaveFlag(MyEnum.Value1);

// Check if the enum value is one of several valid values
myEnum.Should().BeOneOf(MyEnum.Value1, MyEnum.Value2);

Collection Assertions

var collection = new List<int> { 1, 2, 3, 4 };

// Check if the collection contains an item
collection.Should().Contain(2);

// Check if it does not contain an item
collection.Should().NotContain(5);

// Check the count of items
collection.Should().HaveCount(4);

// Check if it contains all specific items
collection.Should().ContainAll(new[] { 1, 2 });

// Check if it matches exactly
collection.Should().BeEquivalentTo(new[] { 1, 2, 3, 4 });

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How to Write Tests with VerbytesAssertions

You can use VerbytesAssertions in your test projects with testing frameworks like xUnit, MSTest, or NUnit.

xUnit Example

using VerbytesAssertions.Exceptions;
using VerbytesAssertions.Extensions;
using Xunit;

public class BooleanAssertionsTests
{
    [Fact]
    public void BeTrue_ShouldPass_WhenValueIsTrue()
    {
        true.Should().BeTrue();
    }

    [Fact]
    public void BeFalse_ShouldFail_WhenValueIsTrue()
    {
        Assert.Throws<AssertionException>(() =>
        {
            true.Should().BeFalse();
        });
    }
}

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License

This library is distributed under the MIT License.