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How to Generate Rust Tests - Step by Step Guide

Note: This tool generates basic-level test templates for simple function signatures. It works best with standard types and may require manual customization for complex generics, lifetimes, or custom types.

Step 1

Paste Your Rust Code

Copy and paste your Rust functions into the input editor. The tool will automatically detect:

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Public and private functions: Generates tests for all function types
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Parameters and return types: Automatically creates test values based on type signatures
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Async functions: Adds #[tokio::test] attribute automatically
Step 2

Review Generated Tests

The generator creates comprehensive test templates automatically:

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Basic tests: Happy path scenarios for each function
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Error cases: Automatic error tests for Result types
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None cases: Tests for Option types returning None
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TODO comments: Placeholders for values you need to customize
Step 3

Copy or Download Tests

Get your test code ready to use in your Cargo project:

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Copy to clipboard: One-click copying to paste into your source file
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Download as file: Save as tests.rs for integration tests
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Customize values: Replace TODO comments and expected_value placeholders

Frequently Asked Questions

What types of tests does this generator create?

The generator creates basic unit tests with #[test] attributes, error case tests for Result types, None case tests for Option types, and async tests with #[tokio::test] for async functions. Each test includes assertion templates and TODO comments where you need to provide specific values.

Do I need to modify the generated tests?

Yes, the generated tests are templates that need customization. You should replace `expected_value` placeholders with actual expected results and fill in TODO comments with appropriate test data. The generator provides a starting point to save you time writing boilerplate.

Does this work with all Rust types?

The generator handles common primitive types (i32, f64, bool, String), standard library types (Vec, Option, Result), and references. For custom types and complex generics, it provides todo!() placeholders that you can fill in with appropriate test values.

Can I use this for integration tests?

Yes! While the generator creates unit test modules by default, you can download the generated code and adapt it for integration tests. Simply remove the #[cfg(test)] and mod tests wrapper, or place the code in your tests/ directory with appropriate imports.

How do I run the generated tests?

Copy the generated test code to the bottom of your Rust source file (or a separate test module), customize the TODO sections and expected values, then run `cargo test` in your terminal. For async tests, make sure you have tokio or async-std in your Cargo.toml dev-dependencies.

Is this tool free to use?

Yes! The Rust Test Generator is completely free to use. You can generate tests for as many functions as you need, with no registration or payment required. All processing is done in your browser for privacy and speed.

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