diff --git a/plugins/ultraplan-local/tests/fixtures/session-state/malformed.json b/plugins/ultraplan-local/tests/fixtures/session-state/malformed.json
new file mode 100644
index 0000000..f0c5216
--- /dev/null
+++ b/plugins/ultraplan-local/tests/fixtures/session-state/malformed.json
@@ -0,0 +1 @@
+{ "schema_version": 1, "project": "x", "status":
diff --git a/plugins/ultraplan-local/tests/fixtures/session-state/valid-in-progress.json b/plugins/ultraplan-local/tests/fixtures/session-state/valid-in-progress.json
new file mode 100644
index 0000000..7cd12d0
--- /dev/null
+++ b/plugins/ultraplan-local/tests/fixtures/session-state/valid-in-progress.json
@@ -0,0 +1,8 @@
+{
+  "schema_version": 1,
+  "project": ".claude/projects/2026-05-01-example-multisession",
+  "next_session_brief_path": ".claude/projects/2026-05-01-example-multisession/brief.md",
+  "next_session_label": "Session 2: Implement validator + tests",
+  "status": "in_progress",
+  "updated_at": "2026-05-01T18:00:00.000Z"
+}