Add assertions for label attention attributions in tests

Co-authored-by: meilame-tayebjee <114609737+meilame-tayebjee@users.noreply.github.com>

Author: Copilot

tests/test_pipeline.py

@@ -197,6 +197,28 @@ def run_full_pipeline(
         explain_with_captum=True,
     )
 
+    # Test label attention assertions
+    if label_attention_enabled:
+        assert predictions["label_attention_attributions"] is not None, (
+            "Label attention attributions should not be None when label_attention_enabled is True"
+        )
+        label_attention_attributions = predictions["label_attention_attributions"]
+        expected_shape = (
+            len(sample_text_data),  # batch_size
+            model_params["n_head"],  # n_head
+            model_params["num_classes"],  # num_classes
+            tokenizer.output_dim,  # seq_len
+        )
+        assert label_attention_attributions.shape == expected_shape, (
+            f"Label attention attributions shape mismatch. "
+            f"Expected {expected_shape}, got {label_attention_attributions.shape}"
+        )
+    else:
+        # When label attention is not enabled, the attributions should be None
+        assert predictions.get("label_attention_attributions") is None, (
+            "Label attention attributions should be None when label_attention_enabled is False"
+        )
+
     # Test explainability functions
     text_idx = 0
     text = sample_text_data[text_idx]