more test coverage

tests/test_platform.py

@@ -91,3 +91,176 @@ def test_specific_paths_for_hints_differs_between_backends():
     paths = set(r.specific_paths_for_hints({"nginx"}))
     assert "/etc/sysconfig/nginx" in paths
     assert "/etc/sysconfig/nginx.conf" in paths
+
+
+def test_read_os_release_file_not_found(tmp_path: Path):
+    result = platform._read_os_release(str(tmp_path / "nonexistent"))
+    assert result == {}
+
+
+def test_read_os_release_handles_invalid_line(tmp_path: Path):
+    p = tmp_path / "os-release"
+    p.write_text(
+        "ID=ubuntu\n" "NO_EQUALS_SIGN\n" 'VERSION="22.04"\n',
+        encoding="utf-8",
+    )
+    result = platform._read_os_release(str(p))
+    assert result["ID"] == "ubuntu"
+    assert result["VERSION"] == "22.04"
+    assert "NO_EQUALS_SIGN" not in result
+
+
+def test_detect_platform_debian(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "debian", "VERSION_ID": "11"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    result = platform.detect_platform()
+    assert result.os_family == "debian"
+    assert result.pkg_backend == "dpkg"
+
+
+def test_detect_platform_ubuntu(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "ubuntu", "VERSION_ID": "22.04"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    result = platform.detect_platform()
+    assert result.os_family == "debian"
+    assert result.pkg_backend == "dpkg"
+
+
+def test_detect_platform_fedora(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "fedora", "VERSION_ID": "38"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    result = platform.detect_platform()
+    assert result.os_family == "redhat"
+    assert result.pkg_backend == "rpm"
+
+
+def test_detect_platform_rocky(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "rocky", "VERSION_ID": "9"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    result = platform.detect_platform()
+    assert result.os_family == "redhat"
+    assert result.pkg_backend == "rpm"
+
+
+def test_detect_platform_unknown_fallback_to_dpkg(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "unknown"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    monkeypatch.setattr(platform.shutil, "which", lambda x: x == "dpkg")
+    result = platform.detect_platform()
+    assert result.os_family == "debian"
+    assert result.pkg_backend == "dpkg"
+
+
+def test_detect_platform_unknown_fallback_to_rpm(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "unknown"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    monkeypatch.setattr(platform.shutil, "which", lambda x: x == "rpm")
+    result = platform.detect_platform()
+    assert result.os_family == "redhat"
+    assert result.pkg_backend == "rpm"
+
+
+def test_detect_platform_completely_unknown(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "unknown"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    monkeypatch.setattr(platform.shutil, "which", lambda x: False)
+    result = platform.detect_platform()
+    assert result.os_family == "unknown"
+    assert result.pkg_backend == "unknown"
+
+
+def test_detect_platform_debian_like(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "linuxmint", "ID_LIKE": "debian"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    result = platform.detect_platform()
+    assert result.os_family == "debian"
+    assert result.pkg_backend == "dpkg"
+
+
+def test_detect_platform_rhel_like(monkeypatch):
+    def fake_read_os_release(path: str = "/etc/os-release") -> dict:
+        return {"ID": "centos", "ID_LIKE": "rhel fedora"}
+
+    monkeypatch.setattr(platform, "_read_os_release", fake_read_os_release)
+    result = platform.detect_platform()
+    assert result.os_family == "redhat"
+    assert result.pkg_backend == "rpm"
+
+
+def test_get_backend_returns_dpkg(monkeypatch):
+    info = platform.PlatformInfo(os_family="debian", pkg_backend="dpkg", os_release={})
+    backend = platform.get_backend(info)
+    assert isinstance(backend, platform.DpkgBackend)
+    assert backend.name == "dpkg"
+
+
+def test_get_backend_returns_rpm(monkeypatch):
+    info = platform.PlatformInfo(os_family="redhat", pkg_backend="rpm", os_release={})
+    backend = platform.get_backend(info)
+    assert isinstance(backend, platform.RpmBackend)
+    assert backend.name == "rpm"
+
+
+def test_get_backend_unknown_with_rpm(monkeypatch):
+    info = platform.PlatformInfo(
+        os_family="unknown", pkg_backend="unknown", os_release={}
+    )
+    monkeypatch.setattr(platform.shutil, "which", lambda x: x == "rpm")
+    backend = platform.get_backend(info)
+    assert isinstance(backend, platform.RpmBackend)
+
+
+def test_get_backend_unknown_with_dpkg(monkeypatch):
+    info = platform.PlatformInfo(
+        os_family="unknown", pkg_backend="unknown", os_release={}
+    )
+    monkeypatch.setattr(platform.shutil, "which", lambda x: x == "dpkg")
+    backend = platform.get_backend(info)
+    assert isinstance(backend, platform.DpkgBackend)
+
+
+def test_dpkg_backend_specific_paths():
+    backend = platform.DpkgBackend()
+    paths = backend.specific_paths_for_hints({"nginx"})
+    assert "/etc/default/nginx" in paths
+    assert "/etc/init.d/nginx" in paths
+    assert "/etc/sysctl.d/nginx.conf" in paths
+
+
+def test_rpm_backend_specific_paths():
+    backend = platform.RpmBackend()
+    paths = backend.specific_paths_for_hints({"nginx"})
+    assert "/etc/sysconfig/nginx" in paths
+    assert "/etc/sysconfig/nginx.conf" in paths
+    assert "/etc/sysctl.d/nginx.conf" in paths
+
+
+def test_is_pkg_config_path_dpkg():
+    backend = platform.DpkgBackend()
+    assert backend.is_pkg_config_path("/etc/apt/sources.list") is True
+    assert backend.is_pkg_config_path("/etc/apt/trusted.gpg") is True
+    assert backend.is_pkg_config_path("/etc/ssh/sshd_config") is False
+
+
+def test_is_pkg_config_path_rpm():
+    backend = platform.RpmBackend()
+    assert backend.is_pkg_config_path("/etc/dnf/dnf.conf") is True
+    assert backend.is_pkg_config_path("/etc/yum.conf") is True
+    assert backend.is_pkg_config_path("/etc/yum.repos.d/custom.repo") is True
+    assert backend.is_pkg_config_path("/etc/ssh/sshd_config") is False