fluent-assertions

What problem does it solve?

Writing robust unit tests in C# can be verbose and hard to read. FluentAssertions provides a fluent interface that makes assertions expressive and easy to understand, reducing maintenance cost and improving test clarity.

Core Features & Use Cases

• Readable assertions: Use Should() chains to express intent clearly (e.g., value.Should().Be(expected), list.Should().Contain(item)).
• Comprehensive verification: Supports value, collection, boolean, null checks, and exception testing, including async scenarios.
• Integration with test frameworks: Works with xUnit, NUnit, or MSTest, enabling consistent assertion patterns across projects.
• Real-world workflows: Verify object states after operations, assert error messages, and ensure sequences and collections meet expected criteria.

Quick Start

Install FluentAssertions into your test project and start writing assertions:

• Add package: dotnet add package FluentAssertions
• Example: var result = MyService.DoWork(); result.Should().BeOfType<MyResult>(); result.Status.Should().Be(Status.Success);
• Async example: await action.Should().ThrowAsync<InvalidOperationException>();