From 38baeae274aaa2eed54f20ec9e03f2e90cf406de Mon Sep 17 00:00:00 2001
From: "codspeed-hq[bot]" <117304815+codspeed-hq[bot]@users.noreply.github.com>
Date: Tue, 14 Apr 2026 12:16:16 +0000
Subject: [PATCH] Add CodSpeed performance benchmarks and CI workflow

---
 .github/workflows/codspeed.yml | 55 ++++++++++++++++++++++++++++++++++
 README.md                      |  1 +
 tests/test_benchmarks.py       | 40 +++++++++++++++++++++++++
 3 files changed, 96 insertions(+)
 create mode 100644 .github/workflows/codspeed.yml
 create mode 100644 tests/test_benchmarks.py

diff --git a/.github/workflows/codspeed.yml b/.github/workflows/codspeed.yml
new file mode 100644
index 00000000..f16977e1
--- /dev/null
+++ b/.github/workflows/codspeed.yml
@@ -0,0 +1,55 @@
+name: CodSpeed
+
+on:
+  push:
+    branches:
+      - "main"
+  pull_request:
+  # `workflow_dispatch` allows CodSpeed to trigger backtest
+  # performance analysis in order to generate initial data.
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  id-token: write
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  benchmarks:
+
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+
+    steps:
+    - uses: actions/checkout@v4
+
+    - name: Set up Python 3.13
+      uses: actions/setup-python@v5
+      with:
+          python-version: '3.13'
+
+    - name: Set up uv
+      uses: astral-sh/setup-uv@v7
+      with:
+        enable-cache: true
+
+    - name: Install dependencies
+      shell: bash
+      run: uv pip install --system -r requirements_dev.txt
+
+    - name: Install the library
+      shell: bash
+      run: uv pip install --system .
+
+    - name: Install pytest-codspeed
+      shell: bash
+      run: uv pip install --system pytest-codspeed
+
+    - name: Run benchmarks
+      uses: CodSpeedHQ/action@v4
+      with:
+        mode: simulation
+        run: pytest tests/test_benchmarks.py --codspeed
diff --git a/README.md b/README.md
index 615e502c..b5313c34 100644
--- a/README.md
+++ b/README.md
@@ -12,6 +12,7 @@
 [![Checked with mypy](http://www.mypy-lang.org/static/mypy_badge.svg)](http://mypy-lang.org/)
 [![Ruff](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/astral-sh/ruff/main/assets/badge/v2.json)](https://github.com/astral-sh/ruff)
 [![DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/mutating/suby)
+[![CodSpeed](https://img.shields.io/endpoint?url=https://codspeed.io/badge.json)](https://codspeed.io/mutating/suby?utm_source=badge)
 
 </details>
 
diff --git a/tests/test_benchmarks.py b/tests/test_benchmarks.py
new file mode 100644
index 00000000..54e42822
--- /dev/null
+++ b/tests/test_benchmarks.py
@@ -0,0 +1,40 @@
+from pathlib import Path
+
+from suby import run
+from suby.run import convert_arguments, split_argument
+
+
+def test_bench_split_argument_simple(benchmark):
+    """Benchmark splitting a simple command string."""
+    benchmark(split_argument, 'python -c pass', False)
+
+
+def test_bench_split_argument_with_quotes(benchmark):
+    """Benchmark splitting a command string with quoted arguments."""
+    benchmark(split_argument, 'python -c "print(\'hello, world!\')"', False)
+
+
+def test_bench_convert_arguments_single_string(benchmark):
+    """Benchmark converting a single string argument."""
+    benchmark(convert_arguments, ('python -c pass',), True, False)
+
+
+def test_bench_convert_arguments_multiple_strings(benchmark):
+    """Benchmark converting multiple string arguments."""
+    benchmark(convert_arguments, ('python', '-c', 'print(777)'), True, False)
+
+
+def test_bench_convert_arguments_with_path(benchmark):
+    """Benchmark converting arguments that include a Path object."""
+    benchmark(convert_arguments, (Path('/usr/bin/python'), '-c pass'), True, False)
+
+
+def test_bench_convert_arguments_no_split(benchmark):
+    """Benchmark converting arguments with split disabled."""
+    benchmark(convert_arguments, ('python', '-c', 'print(777)'), False, False)
+
+
+def test_bench_run_simple_command(benchmark):
+    """Benchmark running a simple subprocess end-to-end."""
+    result = benchmark(run, 'python -c pass', catch_output=True)
+    assert result.returncode == 0