implement PermissionSets.get_many for getting multiple permission sets by name

tests/domain/test_permission_sets.py

@@ -0,0 +1,32 @@
+import pytest
+from atst.domain.permission_sets import PermissionSets
+from atst.domain.exceptions import NotFoundError
+from atst.utils import first_or_none
+
+
+def test_get_all():
+    roles = PermissionSets.get_all()
+    assert roles
+
+
+def test_get_existing_permission_set():
+    role = PermissionSets.get("portfolio_poc")
+    assert role.name == "portfolio_poc"
+
+
+def test_get_nonexistent_permission_set():
+    with pytest.raises(NotFoundError):
+        PermissionSets.get("nonexistent")
+
+
+def test_get_many():
+    perms_sets = PermissionSets.get_many(
+        [PermissionSets.VIEW_PORTFOLIO_FUNDING, PermissionSets.EDIT_PORTFOLIO_FUNDING]
+    )
+    assert len(perms_sets) == 2
+    assert first_or_none(
+        lambda p: p.name == PermissionSets.VIEW_PORTFOLIO_FUNDING, perms_sets
+    )
+    assert first_or_none(
+        lambda p: p.name == PermissionSets.EDIT_PORTFOLIO_FUNDING, perms_sets
+    )