diff --git a/.github/changed-files.yml b/.github/changed-files.yml
index 152273e6013..56c53e855bc 100644
--- a/.github/changed-files.yml
+++ b/.github/changed-files.yml
@@ -1,5 +1,6 @@
 linux:
   - 'src/**'
+  - 'rustutils/**'
   - 'test/**'
   - 'render-test/**'
   - 'expression-test/**'
@@ -12,6 +13,7 @@ linux:
   - 'BUILD.bazel'
   - '.bazelrc'
   - '.bazelversion'
+  - '!**/*.md'
 windows:
   - '.github/workflows/windows-ci.yml'
   - 'src/**'
@@ -24,11 +26,11 @@ windows:
   - 'metrics/**'
   - 'vendor/**'
   - '.gitmodules'
-  - '!**/*.md'
   - 'WORKSPACE'
   - 'BUILD.bazel'
   - '.bazelrc'
   - '.bazelversion'
+  - '!**/*.md'
 ios:
   - 'platform/ios/**'
   - 'platform/darwin/**'
@@ -44,12 +46,12 @@ ios:
   - 'test/**'
   - 'vendor/**'
   - '.gitmodules'
-  - '!**/*.md'
   - 'WORKSPACE'
   - 'BUILD.bazel'
   - '.bazelrc'
   - '.bazelversion'
   - 'pnpm-lock.yaml'
+  - '!**/*.md'
 android:
   - 'CMakeLists.txt'
   - 'platform/android/**'
diff --git a/.github/workflows/rust-ci.yaml b/.github/workflows/rust-ci.yaml
new file mode 100644
index 00000000000..f750de407d5
--- /dev/null
+++ b/.github/workflows/rust-ci.yaml
@@ -0,0 +1,39 @@
+name: rust-ci
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+defaults:
+  run:
+    shell: bash
+    working-directory: rustutils/
+
+jobs:
+  test:
+    name: Rust tests
+    runs-on: ubuntu-latest
+    steps:
+      - uses: taiki-e/install-action@v2
+        with: { tool: just }
+      - uses: actions/checkout@v4
+      - run: just -v ci-test
+
+  msrv:
+    name: Rust tests MSRV (Minimal Supported Rust Version)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: taiki-e/install-action@v2
+        with: { tool: just }
+      - uses: actions/checkout@v4
+      - name: Read crate metadata
+        id: metadata
+        run: echo "rust-version=$(sed -ne 's/rust-version *= *\"\(.*\)\"/\1/p' Cargo.toml)" >> "$GITHUB_OUTPUT"
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: ${{ steps.metadata.outputs.rust-version }}
+      - run: just ci-test-msrv
diff --git a/docs/mdbook/src/rust.md b/docs/mdbook/src/rust.md
index 30980cd57ce..d063ba86a3c 100644
--- a/docs/mdbook/src/rust.md
+++ b/docs/mdbook/src/rust.md
@@ -1,6 +1,6 @@
 # Rust
 
-We have added experimental support for intergrating Rust code into the source tree.
+We have added experimental support for integrating Rust code into the source tree.
 
 ## Rust Bridge
 
@@ -16,7 +16,7 @@ When building with CMake, need to have the correct Rust toolchain(s) installed.
 
 You can use `rustup` to manage toolchains. Which toolchain you needs depends on your host platform and for what platform you are trying to build. If your host and target platform are the same, you probably have the correct toolchain installed after installing Rust. For example when building for **Android** and building on a **x84 Linux** host you would use the following command:
 
-```
+```shell
 rustup target add --toolchain stable-x86_64-unknown-linux-gnu aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android
 ```
 
@@ -24,7 +24,7 @@ See [Platform Support](https://doc.rust-lang.org/nightly/rustc/platform-support.
 
 You also need to have cxxbridge installed:
 
-```
+```shell
 cargo install cxxbridge-cmd
 ```
 
@@ -36,10 +36,19 @@ Pass the `--//:use_rust` flag to Bazel commands.
 
 Note that when [generating an Xcode project](./ios/README.md) you should not pass this option to Bazel directly, but as follows:
 
-```
+```shell
 bazel run //platform/ios:xcodeproj --@rules_xcodeproj//xcodeproj:extra_common_flags="--//:renderer=metal --//:use_rust"
 ```
 
+## Just
+
+For the Rust subproject, we suggest installing [just](https://github.com/casey/just#readme), a modern alternative to `make`. The `justfile` in the root directory contains a number of useful commands for building and testing the Rust code.  The same commands can be run directly, but `just` provides a more convenient interface.
+
+* Install `just` with `cargo install just`
+* Run `just` in the `/rustutils` dir to see a list of available commands
+* Some common commands: `just check`, `just test`, `just fmt`
+* To run the same steps as used by CI, run `just ci-test`
+
 ## Creating a new Module
 
 To create a new module:
@@ -47,15 +56,15 @@ To create a new module:
 1. Add a new source file to `rustutils/src/example.rs`.
 2. Implement it, see the [CXX documentation](https://cxx.rs/index.html) or see `rustutils/src/color.rs` for an example.
 3. Create a C++ source file that will use the generated C++ header. See `src/mbgl/util/color.rs.cpp` for an example. Import the generated header with
-    ```
+    ```cpp
     #include <rustutils/example.hpp>
     ```
 4. Conditionally include either the `*.rs.cpp` file or the `*.cpp` file it replaces in CMake and Bazel. Here is what it looks like for CMake:
-    ```
+    ```cmake
     ${PROJECT_SOURCE_DIR}/src/mbgl/util/color$<IF:$<BOOL:${MLN_USE_RUST}>,.rs.cpp,.cpp>
     ```
     And here for Bazel:
-    ```
+    ```bazel
     select({
       "//:rust": [
           "src/mbgl/util/color.rs.cpp",
diff --git a/rustutils/Cargo.lock b/rustutils/Cargo.lock
index 16003c0398f..2e77ada5c4b 100644
--- a/rustutils/Cargo.lock
+++ b/rustutils/Cargo.lock
@@ -2,50 +2,117 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "anstyle"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "55cc3b69f167a1ef2e161439aa98aed94e6028e5f9a59be9a6ffb47aef1651f9"
+
 [[package]]
 name = "cc"
-version = "1.1.6"
+version = "1.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "13208fcbb66eaeffe09b99fffbe1af420f00a7b35aa99ad683dfc1aa76145229"
+dependencies = [
+ "shlex",
+]
+
+[[package]]
+name = "clap"
+version = "4.5.27"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2aba8f4e9906c7ce3c73463f62a7f0c65183ada1a2d47e397cc8810827f9694f"
+checksum = "769b0145982b4b48713e01ec42d61614425f27b7058bda7180a3a41f30104796"
+dependencies = [
+ "clap_builder",
+]
+
+[[package]]
+name = "clap_builder"
+version = "4.5.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1b26884eb4b57140e4d2d93652abfa49498b938b3c9179f9fc487b0acc3edad7"
+dependencies = [
+ "anstyle",
+ "clap_lex",
+ "strsim",
+]
+
+[[package]]
+name = "clap_lex"
+version = "0.7.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f46ad14479a25103f283c0f10005961cf086d8dc42205bb44c46ac563475dca6"
+
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
 
 [[package]]
 name = "csscolorparser"
-version = "0.6.2"
+version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eb2a7d3066da2de787b7f032c736763eb7ae5d355f81a68bab2675a96008b0bf"
+checksum = "46f9a16a848a7fb95dd47ce387ac1ee9a6df879ba784b815537fcd388a1a8288"
 dependencies = [
  "phf",
 ]
 
 [[package]]
 name = "cxx"
-version = "1.0.124"
+version = "1.0.137"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "273dcfd3acd4e1e276af13ed2a43eea7001318823e7a726a6b3ed39b4acc0b82"
+checksum = "0fc894913dccfed0f84106062c284fa021c3ba70cb1d78797d6f5165d4492e45"
 dependencies = [
  "cc",
+ "cxxbridge-cmd",
  "cxxbridge-flags",
  "cxxbridge-macro",
+ "foldhash",
  "link-cplusplus",
 ]
 
+[[package]]
+name = "cxxbridge-cmd"
+version = "1.0.137"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e0d2cb64a95b4b5a381971482235c4db2e0208302a962acdbe314db03cbbe2fb"
+dependencies = [
+ "clap",
+ "codespan-reporting",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "cxxbridge-flags"
-version = "1.0.124"
+version = "1.0.137"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "839fcd5e43464614ffaa989eaf1c139ef1f0c51672a1ed08023307fa1b909ccd"
+checksum = "5f797b0206463c9c2a68ed605ab28892cca784f1ef066050f4942e3de26ad885"
 
 [[package]]
 name = "cxxbridge-macro"
-version = "1.0.124"
+version = "1.0.137"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4b2c1c1776b986979be68bb2285da855f8d8a35851a769fca8740df7c3d07877"
+checksum = "e79010a2093848e65a3e0f7062d3f02fb2ef27f866416dfe436fccfa73d3bb59"
 dependencies = [
  "proc-macro2",
  "quote",
+ "rustversion",
  "syn",
 ]
 
+[[package]]
+name = "foldhash"
+version = "0.1.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0d2fde1f7b3d48b8395d5f2de76c18a528bd6a9cdde438df747bfcba3e05d6f"
+
 [[package]]
 name = "link-cplusplus"
 version = "1.0.9"
@@ -57,9 +124,9 @@ dependencies = [
 
 [[package]]
 name = "phf"
-version = "0.11.2"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ade2d8b8f33c7333b51bcf0428d37e217e9f32192ae4772156f65063b8ce03dc"
+checksum = "1fd6780a80ae0c52cc120a26a1a42c1ae51b247a253e4e06113d23d2c2edd078"
 dependencies = [
  "phf_macros",
  "phf_shared",
@@ -67,9 +134,9 @@ dependencies = [
 
 [[package]]
 name = "phf_generator"
-version = "0.11.2"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "48e4cc64c2ad9ebe670cb8fd69dd50ae301650392e81c05f9bfcb2d5bdbc24b0"
+checksum = "3c80231409c20246a13fddb31776fb942c38553c51e871f8cbd687a4cfb5843d"
 dependencies = [
  "phf_shared",
  "rand",
@@ -77,9 +144,9 @@ dependencies = [
 
 [[package]]
 name = "phf_macros"
-version = "0.11.2"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3444646e286606587e49f3bcf1679b8cef1dc2c5ecc29ddacaffc305180d464b"
+checksum = "f84ac04429c13a7ff43785d75ad27569f2951ce0ffd30a3321230db2fc727216"
 dependencies = [
  "phf_generator",
  "phf_shared",
@@ -90,27 +157,27 @@ dependencies = [
 
 [[package]]
 name = "phf_shared"
-version = "0.11.2"
+version = "0.11.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90fcb95eef784c2ac79119d1dd819e162b5da872ce6f3c3abe1e8ca1c082f72b"
+checksum = "67eabc2ef2a60eb7faa00097bd1ffdb5bd28e62bf39990626a582201b7a754e5"
 dependencies = [
  "siphasher",
 ]
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.86"
+version = "1.0.93"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5e719e8df665df0d1c8fbfd238015744736151d4445ec0836b8e628aae103b77"
+checksum = "60946a68e5f9d28b0dc1c21bb8a97ee7d018a8b322fa57838ba31cc878e22d99"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.36"
+version = "1.0.38"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0fa76aaf39101c457836aec0ce2316dbdc3ab723cdda1c6bd4e6ad4208acaca7"
+checksum = "0e4dccaaaf89514f546c693ddc140f729f958c247918a13380cccc6078391acc"
 dependencies = [
  "proc-macro2",
 ]
@@ -132,31 +199,146 @@ checksum = "ec0be4795e2f6a28069bec0b5ff3e2ac9bafc99e6a9a7dc3547996c5c816922c"
 
 [[package]]
 name = "rustutils"
-version = "0.1.0"
+version = "0.0.0"
 dependencies = [
  "csscolorparser",
  "cxx",
 ]
 
+[[package]]
+name = "rustversion"
+version = "1.0.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f7c45b9784283f1b2e7fb61b42047c2fd678ef0960d4f6f1eba131594cc369d4"
+
+[[package]]
+name = "shlex"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0fda2ff0d084019ba4d7c6f371c95d8fd75ce3524c3cb8fb653a3023f6323e64"
+
 [[package]]
 name = "siphasher"
-version = "0.3.11"
+version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38b58827f4464d87d377d175e90bf58eb00fd8716ff0a62f80356b5e61555d0d"
+checksum = "56199f7ddabf13fe5074ce809e7d3f42b42ae711800501b5b16ea82ad029c39d"
+
+[[package]]
+name = "strsim"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
 
 [[package]]
 name = "syn"
-version = "2.0.72"
+version = "2.0.96"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "dc4b9b9bf2add8093d3f2c0204471e951b2285580335de42f9d2534f3ae7a8af"
+checksum = "d5d0adab1ae378d7f53bdebc67a39f1f151407ef230f0ce2883572f5d8985c80"
 dependencies = [
  "proc-macro2",
  "quote",
  "unicode-ident",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "unicode-ident"
-version = "1.0.12"
+version = "1.0.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "11cd88e12b17c6494200a9c1b683a04fcac9573ed74cd1b62aeb2727c5592243"
+
+[[package]]
+name = "unicode-width"
+version = "0.1.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
+dependencies = [
+ "windows-sys",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"
diff --git a/rustutils/Cargo.toml b/rustutils/Cargo.toml
index 8d98a0d03c4..f32fceec61c 100644
--- a/rustutils/Cargo.toml
+++ b/rustutils/Cargo.toml
@@ -1,17 +1,19 @@
 [package]
 name = "rustutils"
-version = "0.1.0"
+version = "0.0.0"
+publish = false  # This crate is not intended to be published on crates.io
 authors = ["MapLibre contributors"]
 description = "Core Rust utilities for MapLibre Native"
 edition = "2021"
 license = "BSD-2-Clause"
 repository = "https://github.com/maplibre/maplibre-native"
+rust-version = "1.78.0"
 
 [lib]
 crate-type = ["staticlib"]
 
 [dependencies]
-csscolorparser = "0.6.2"
+csscolorparser = "0.7.0"
 cxx = "1"
 
 [profile.release]
diff --git a/rustutils/justfile b/rustutils/justfile
new file mode 100644
index 00000000000..5149fadc25b
--- /dev/null
+++ b/rustutils/justfile
@@ -0,0 +1,64 @@
+#!/usr/bin/env just --justfile
+
+@_default:
+    just --list
+
+# Clean all build artifacts
+clean:
+    cargo clean
+
+# Update all dependencies, including the breaking changes. Requires nightly toolchain (install with `rustup install nightly`)
+update:
+    cargo +nightly -Z unstable-options update --breaking
+    cargo update
+
+# Quick compile without building a binary
+check:
+    RUSTFLAGS='-D warnings' cargo check --workspace --all-targets
+
+# Build the library
+build:
+    cargo build --workspace
+
+# Run cargo clippy to lint the code
+clippy:
+    cargo clippy --all-targets --workspace -- -D warnings
+
+# Test code formatting
+test-fmt:
+    cargo fmt --all -- --check
+
+# Reformat all code `cargo fmt`. If nightly is available, use it for better results
+fmt:
+    #!/usr/bin/env bash
+    set -euo pipefail
+    if command -v cargo +nightly &> /dev/null; then
+        echo 'Reformatting Rust code using nightly Rust fmt to sort imports'
+        cargo +nightly fmt --all -- --config imports_granularity=Module,group_imports=StdExternalCrate
+    else
+        echo 'Reformatting Rust with the stable cargo fmt.  Install nightly with `rustup install nightly` for better results'
+        cargo fmt --all
+    fi
+
+# Run all tests
+test:
+    cargo test --all-targets --workspace
+
+# Test documentation
+test-doc:
+    RUSTDOCFLAGS="-D warnings" cargo doc --no-deps
+
+# Build and open code documentation
+docs:
+    cargo doc --no-deps --open
+
+# Print Rust version information
+rust-info:
+    rustc --version
+    cargo --version
+
+# Run all tests as expected by CI
+ci-test: rust-info clippy build test test-doc
+
+# Run minimal subset of tests to ensure compatibility with MSRV (Minimum Supported Rust Version). This assumes the default toolchain is already set to MSRV.
+ci-test-msrv: rust-info build test
diff --git a/rustutils/src/color.rs b/rustutils/src/color.rs
index 090bb76a878..12ba926add1 100644
--- a/rustutils/src/color.rs
+++ b/rustutils/src/color.rs
@@ -2,6 +2,9 @@ use csscolorparser::Color;
 
 #[cxx::bridge(namespace = "rustutils")]
 mod ffi {
+    // TODO: Use #[cfg_attr(test, derive(...))] once supported
+    // See https://github.com/dtolnay/cxx/issues/1022
+    #[derive(Debug, PartialEq)]
     struct ParsedColor {
         pub success: bool,
         pub r: f32,
@@ -20,10 +23,10 @@ pub fn parse_css_color(css_str: &str) -> ffi::ParsedColor {
         .parse::<Color>()
         .map(|color| ffi::ParsedColor {
             success: true,
-            r: color.r as f32,
-            g: color.g as f32,
-            b: color.b as f32,
-            a: color.a as f32,
+            r: color.r,
+            g: color.g,
+            b: color.b,
+            a: color.a,
         })
         .unwrap_or_else(|_| ffi::ParsedColor {
             success: false,
@@ -33,3 +36,42 @@ pub fn parse_css_color(css_str: &str) -> ffi::ParsedColor {
             a: 0.0,
         })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_parse_css_color() {
+        assert_eq!(
+            parse_css_color("rgb(255, 0, 0)"),
+            ffi::ParsedColor {
+                success: true,
+                r: 1.0,
+                g: 0.0,
+                b: 0.0,
+                a: 1.0,
+            }
+        );
+        assert_eq!(
+            parse_css_color("rgba(255, 0, 0, 0.5)"),
+            ffi::ParsedColor {
+                success: true,
+                r: 1.0,
+                g: 0.0,
+                b: 0.0,
+                a: 0.5,
+            }
+        );
+        assert_eq!(
+            parse_css_color("invalid"),
+            ffi::ParsedColor {
+                success: false,
+                r: 0.0,
+                g: 0.0,
+                b: 0.0,
+                a: 0.0,
+            }
+        );
+    }
+}