test: add UTs for api/services recommend_app, tools, workflow (#32645)

Co-authored-by: QuantumGhost <obelisk.reg+git@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/tests/unit_tests/services/workflow/test_scheduler.py

@@ -0,0 +1,89 @@
+import pytest
+
+from services.workflow.entities import WorkflowScheduleCFSPlanEntity
+from services.workflow.scheduler import CFSPlanScheduler, SchedulerCommand
+
+
+class TestSchedulerCommand:
+    def test_enum_values(self):
+        assert SchedulerCommand.RESOURCE_LIMIT_REACHED == "resource_limit_reached"
+        assert SchedulerCommand.NONE == "none"
+
+    def test_enum_is_str(self):
+        for member in SchedulerCommand:
+            assert isinstance(member, str)
+
+
+class TestCFSPlanScheduler:
+    def test_stores_plan(self):
+        plan = WorkflowScheduleCFSPlanEntity(
+            schedule_strategy=WorkflowScheduleCFSPlanEntity.Strategy.Nop,
+            granularity=-1,
+        )
+
+        class ConcretePlanScheduler(CFSPlanScheduler):
+            def can_schedule(self):
+                return SchedulerCommand.NONE
+
+        scheduler = ConcretePlanScheduler(plan)
+
+        assert scheduler.plan is plan
+        assert scheduler.plan.schedule_strategy == WorkflowScheduleCFSPlanEntity.Strategy.Nop
+        assert scheduler.plan.granularity == -1
+
+    def test_cannot_instantiate_abstract(self):
+        plan = WorkflowScheduleCFSPlanEntity(
+            schedule_strategy=WorkflowScheduleCFSPlanEntity.Strategy.TimeSlice,
+            granularity=10,
+        )
+        with pytest.raises(TypeError):
+            CFSPlanScheduler(plan)
+
+    def test_concrete_subclass_can_schedule(self):
+        plan = WorkflowScheduleCFSPlanEntity(
+            schedule_strategy=WorkflowScheduleCFSPlanEntity.Strategy.TimeSlice,
+            granularity=5,
+        )
+
+        class TimedScheduler(CFSPlanScheduler):
+            def can_schedule(self):
+                if self.plan.granularity > 0:
+                    return SchedulerCommand.NONE
+                return SchedulerCommand.RESOURCE_LIMIT_REACHED
+
+        scheduler = TimedScheduler(plan)
+        assert scheduler.can_schedule() == SchedulerCommand.NONE
+
+    def test_concrete_subclass_resource_limit(self):
+        plan = WorkflowScheduleCFSPlanEntity(
+            schedule_strategy=WorkflowScheduleCFSPlanEntity.Strategy.TimeSlice,
+            granularity=-1,
+        )
+
+        class TimedScheduler(CFSPlanScheduler):
+            def can_schedule(self):
+                if self.plan.granularity > 0:
+                    return SchedulerCommand.NONE
+                return SchedulerCommand.RESOURCE_LIMIT_REACHED
+
+        scheduler = TimedScheduler(plan)
+        assert scheduler.can_schedule() == SchedulerCommand.RESOURCE_LIMIT_REACHED
+
+
+class TestWorkflowScheduleCFSPlanEntity:
+    def test_strategy_values(self):
+        assert WorkflowScheduleCFSPlanEntity.Strategy.TimeSlice == "time-slice"
+        assert WorkflowScheduleCFSPlanEntity.Strategy.Nop == "nop"
+
+    def test_default_granularity(self):
+        plan = WorkflowScheduleCFSPlanEntity(
+            schedule_strategy=WorkflowScheduleCFSPlanEntity.Strategy.Nop,
+        )
+        assert plan.granularity == -1
+
+    def test_explicit_granularity(self):
+        plan = WorkflowScheduleCFSPlanEntity(
+            schedule_strategy=WorkflowScheduleCFSPlanEntity.Strategy.TimeSlice,
+            granularity=100,
+        )
+        assert plan.granularity == 100