test: fix unit tests

lib/charms/hpc_libs/v0/slurm_ops.py

@@ -62,11 +62,13 @@ def _on_install(self, _) -> None:
     "ConfigurationManager",
     "ServiceType",
     "SlurmManagerBase",
+    "SlurmOpsError",
 ]
 
 import json
 import logging
 import re
+import socket
 import subprocess
 from collections.abc import Mapping
 from enum import Enum
@@ -82,7 +84,7 @@ def _on_install(self, _) -> None:
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 3
+LIBPATCH = 5
 
 # Charm library dependencies to fetch during `charmcraft pack`.
 PYDEPS = ["pyyaml>=6.0.1"]
@@ -131,7 +133,8 @@ def install() -> None:
 def version() -> str:
     """Get the current version of Slurm installed on the system."""
     info = yaml.safe_load(_snap("info", "slurm"))
-    ver: str = info["installed"]
+    if (ver := info.get("installed")) is None:
+        raise SlurmOpsError("unable to retrive snap info. Ensure slurm is correctly installed")
     return ver.split(maxsplit=1)[0]
 
 
@@ -177,6 +180,7 @@ class ServiceType(Enum):
     """Type of Slurm service to manage."""
 
     MUNGED = "munged"
+    PROMETHEUS_EXPORTER = "slurm-prometheus-exporter"
     SLURMD = "slurmd"
     SLURMCTLD = "slurmctld"
     SLURMDBD = "slurmdbd"
@@ -208,6 +212,17 @@ def restart(self) -> None:
         """Restart service."""
         _snap("restart", f"slurm.{self._service.value}")
 
+    def active(self) -> bool:
+        """Return True if the service is active."""
+        info = yaml.safe_load(_snap("info", "slurm"))
+        if (services := info.get("services")) is None:
+            raise SlurmOpsError("unable to retrive snap info. Ensure slurm is correctly installed")
+
+        # Assume `services` contains the service, since `ServiceManager` is not exposed as a
+        # public interface for now.
+        # We don't do `"active" in state` because the word "active" is also part of "inactive" :)
+        return "inactive" not in services[f"slurm.{self._service.value}"]
+
 
 class ConfigurationManager:
     """Control configuration of a Slurm component."""
@@ -271,10 +286,23 @@ def generate_key(self) -> None:
         _mungectl("key", "generate")
 
 
+class PrometheusExporterManager(ServiceManager):
+    """Manage `slurm-prometheus-exporter` service operations."""
+
+    def __init__(self) -> None:
+        self._service = ServiceType.PROMETHEUS_EXPORTER
+
+
 class SlurmManagerBase(ServiceManager):
     """Base manager for Slurm services."""
 
     def __init__(self, service: ServiceType) -> None:
         self._service = service
         self.config = ConfigurationManager(service.config_name)
         self.munge = MungeManager()
+        self.exporter = PrometheusExporterManager()
+
+    @property
+    def hostname(self) -> str:
+        """The hostname where this manager is running."""
+        return socket.gethostname().split(".")[0]

tests/unit/test_charm.py

@@ -56,6 +56,7 @@ def test_install_fail(self, _, defer) -> None:
         defer.assert_called()
 
     @patch("slurmd_ops.SlurmdManager.install")
+    @patch("slurmd_ops.SlurmdManager.version", return_value="23.11.7")
     @patch("pathlib.Path.read_text", return_value="v1.0.0")
     @patch("ops.model.Unit.set_workload_version")
     @patch("ops.model.Resources.fetch")

tests/unit/utils/test_slurmd.py

@@ -26,18 +26,6 @@
 class TestSlurmd(unittest.TestCase):
     """Unit tests for methods in slurmd utility module."""
 
-    @patch("charms.operator_libs_linux.v1.systemd._systemctl")
-    def test_start(self, _) -> None:
-        slurmd.start()
-
-    @patch("charms.operator_libs_linux.v1.systemd._systemctl")
-    def test_stop(self, _) -> None:
-        slurmd.stop()
-
-    @patch("charms.operator_libs_linux.v1.systemd._systemctl")
-    def test_restart(self, _) -> None:
-        slurmd.restart()
-
     @patch("pathlib.Path.write_text")
     def test_overwrite_default(self, _) -> None:
         slurmd.override_default("127.0.0.1")