Add tests for reason and status conversions

src/tests/_internal/core/models/test_runs.py

@@ -0,0 +1,24 @@
+from dstack._internal.core.models.runs import (
+    JobStatus,
+    JobTerminationReason,
+    RunStatus,
+    RunTerminationReason,
+)
+
+
+def test_run_to_job_termination_reason_works_with_all_enum_variants():
+    for run_termination_reason in RunTerminationReason:
+        job_termination_reason = run_termination_reason.to_job_termination_reason()
+        assert isinstance(job_termination_reason, JobTerminationReason)
+
+
+def test_run_termination_reason_to_status_works_with_all_enum_variants():
+    for run_termination_reason in RunTerminationReason:
+        run_status = run_termination_reason.to_status()
+        assert isinstance(run_status, RunStatus)
+
+
+def test_job_termination_reason_to_status_works_with_all_enum_varians():
+    for job_termination_reason in JobTerminationReason:
+        job_status = job_termination_reason.to_status()
+        assert isinstance(job_status, JobStatus)