conformer 0.1.0

A simple framework for authoring conformance test suites.

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conformer helps you write and visualize conformance test suites.

Background / Initial Motivation

I have a cross platform renderer.

At a high level it is a Renderer trait and then a few different structs that impl Renderer for Self.

Since mid February 2020 I've been using a test suite to assert that all of my renderers work properly when called with different RenderGraphs.

During May 2021 I was working on cleaning this conformance testing code and decided to pull it out into an open source library in case it helps others with writing their own conformance test suites.


At this time, the best way to get started with conformer is to check out the example where we test a simple renderer.


conformer comes bundles with two ways to visualize your test results.

Simple Visual

The simple visualizer is useful for writing results to stdout.

Metal Graphics API Renderer Tests
Test the renderer.

25 test results
Renderer should use the desired clear color ... ok
Renderer should render a textured quad using a sub-section of a specified texture ... ok
Resize framebuffer depth texture ... ok
Render UI quad with solid background ... ok
Render two textured quads from different atlases ... FAILED
Render two textured quads from the same atlas ... ok
UI quads Z ... ok
Render mock text glyph quad using single component texture ... FAILED
Render disks using triangle strips ... ok
Resize framebuffer color texture ... ok
Renderer should update a sub-section of a texture on the GPU. ... ok
Render 3 particles ... FAILED
Non skinned mesh with high detail mesh shader - light from above ... FAILED
# ...
# ...

test result: FAILED. 11 passed; 14 failed
thread 'renderer_tests' panicked at 'FAILED', crates/renderer-test/src/
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace


test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in 2.61s

HTML Visual

The HTML visualizer is useful when you want to be able to see why a test failed.

It's flexible in that you can generate any HTML you like in order to best visualize your test case, and it just wraps it with basic information like the test's title, description and whether or not it passed or failed.

HTML visualization

To Test

To run the test suite.

# Clone the repository
git clone
cd conformer

# Run tests
cargo test --all


conformer is licensed under either of