Add downstream test for jiter

(cherry picked from commit 0acbc59)

Author: msimacek

.github/workflows/downstream-tests.yml

@@ -13,6 +13,7 @@ jobs:
         - pybind11
         - virtualenv
         - pyo3
+        - jiter
         os:
         - id: ubuntu-latest
           platform: linux
@@ -35,7 +36,7 @@ jobs:
       run: brew install cmake
 
     - name: Install Rust toolchain
-      if: ${{ matrix.name == 'pyo3' }}
+      if: ${{ matrix.name == 'pyo3' || matrix.name == 'jiter' }}
       run: |
         curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
         echo "${HOME}/.cargo/bin" >> $GITHUB_PATH

mx.graalpython/downstream_tests.py

@@ -153,6 +153,17 @@ def downstream_test_pyo3(graalpy):
     run_in_venv(venv, ['pip', 'install', 'nox'])
     run_in_venv(venv, ['nox', '-s', 'test-py'], cwd=src)
 
+@downstream_test('jiter')
+def downstream_test_jiter(graalpy, testdir):
+    run(['git', 'clone', 'https://github.com/pydantic/jiter.git', '-b', 'main'], cwd=testdir)
+    src = testdir / 'jiter'
+    venv = src / 'venv'
+    run([graalpy, '-m', 'venv', str(venv)])
+    run_in_venv(venv, ['pip', 'install', '-r', 'crates/jiter-python/tests/requirements.txt'], cwd=src)
+    run_in_venv(venv, ['pip', 'install', '-e', 'crates/jiter-python',
+                       '--config-settings=build-args=--profile dev'], cwd=src)
+    run_in_venv(venv, ['pytest', '-v', '--tb=short', 'crates/jiter-python/tests'], cwd=src)
+    run_in_venv(venv, ['python', 'crates/jiter-python/bench.py', 'jiter', 'jiter-cache', '--fast'], cwd=src)
 
 def run_downstream_test(python, project):
     DOWNSTREAM_TESTS[project](python)