test: cover Mistral shared-expert memory estimate

tests/test_mistral_architecture_contracts.py

@@ -5,6 +5,7 @@ from __future__ import annotations
 from types import SimpleNamespace
 
 import pytest
+import torch
 import torch.nn as nn
 
 from obliteratus.architecture_profiles import ArchitectureClass, detect_architecture
@@ -144,6 +145,14 @@ def test_composite_profile_uses_text_backbone_without_misclassifying_mistral3():
     assert moe.total_params_b >= 100
 
 
+def test_composite_memory_estimate_counts_routed_and_shared_experts():
+    config = _mistral3_config(_mistral4_text_config())
+
+    estimate_gb = loader._estimate_model_memory_gb(config, torch.bfloat16)
+
+    assert 200 < estimate_gb < 300
+
+
 def test_mistral_small_4_name_fallback_is_large_moe():
     profile = detect_architecture("mistralai/Mistral-Small-4-119B-2603")