test(docker): add Docker Desktop auto-start and detection

tests/test_docker_build.py

@@ -2,6 +2,7 @@
 import os
 import shutil
 import subprocess
+import sys
 import time
 
 import pytest
@@ -14,14 +15,82 @@ WEB_PORT = 18080
 HOOK_PORT = 18999
 
 
-@pytest.mark.docker
-def test_docker_image_builds(tmp_path):
-    """Build the Docker image. Slow; opt-in."""
+def _docker_daemon_ready() -> bool:
+    result = subprocess.run(
+        ["docker", "info"],
+        capture_output=True,
+        text=True,
+        timeout=10,
+    )
+    return result.returncode == 0
+
+
+def _start_docker_desktop() -> bool:
+    if sys.platform != "win32":
+        return False
+    docker_paths = [
+        os.path.expandvars(r"%ProgramFiles%\Docker\Docker\Docker Desktop.exe"),
+        os.path.expandvars(r"%LOCALAPPDATA%\Docker\Docker Desktop.exe"),
+        r"C:\Program Files\Docker\Docker\Docker Desktop.exe",
+        r"C:\Users\Ed\AppData\Local\Docker\Docker Desktop.exe",
+    ]
+    for path in docker_paths:
+        if os.path.exists(path):
+            try:
+                subprocess.Popen([path], shell=False)
+                return True
+            except Exception:
+                pass
+    service_result = subprocess.run(
+        ["net", "start", "com.docker.service"],
+        capture_output=True,
+        text=True,
+        timeout=10,
+    )
+    if service_result.returncode == 0:
+        return True
+    return False
+
+
+def _wait_for_docker(timeout: int = 60) -> bool:
+    start = time.time()
+    while time.time() - start < timeout:
+        if _docker_daemon_ready():
+            return True
+        time.sleep(2)
+    return False
+
+
+@pytest.fixture(scope="module")
+def ensure_docker():
+    """Ensure Docker daemon is running before running tests."""
     if os.environ.get("RUN_DOCKER_TEST") != "1":
         pytest.skip("Set RUN_DOCKER_TEST=1 to enable")
-    if not _docker_available():
-        pytest.skip("Docker not available in this environment")
 
+    if not shutil.which("docker"):
+        pytest.skip("Docker CLI not installed")
+
+    if _docker_daemon_ready():
+        yield
+        return
+
+    started = _start_docker_desktop()
+    if not started:
+        pytest.skip(
+            "Docker daemon not running and Docker Desktop not found/installed. "
+            "Please install Docker Desktop on this system."
+        )
+
+    ready = _wait_for_docker()
+    if not ready:
+        pytest.skip("Docker daemon did not become ready within 60s")
+
+    yield
+
+
+@pytest.mark.docker
+def test_docker_image_builds(ensure_docker, tmp_path):
+    """Build the Docker image. Slow; opt-in."""
     repo_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
     result = subprocess.run(
         ["docker", "build", "-t", IMAGE_NAME, "."],
@@ -32,13 +101,8 @@ def test_docker_image_builds(tmp_path):
 
 
 @pytest.mark.docker
-def test_docker_container_starts_and_responds():
+def test_docker_container_starts_and_responds(ensure_docker):
     """Run the container, verify web and hook endpoints respond."""
-    if os.environ.get("RUN_DOCKER_TEST") != "1":
-        pytest.skip("Set RUN_DOCKER_TEST=1 to enable")
-    if not _docker_available():
-        pytest.skip("Docker not available in this environment")
-
     _cleanup_container()
 
     repo_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
@@ -78,10 +142,6 @@ def test_docker_container_starts_and_responds():
         _cleanup_container()
 
 
-def _docker_available() -> bool:
-    return shutil.which("docker") is not None
-
-
 def _cleanup_container() -> None:
     subprocess.run(
         ["docker", "rm", "-f", CONTAINER_NAME],