test: add test for auto-flip computation for all components

tests/test_svd_labels.py

@@ -71,3 +71,36 @@ def test_compute_flip_direction_insufficient_data():
     }
 
     assert compute_flip_direction(1, party_scores) is False
+
+
+def test_auto_flip_computation_for_all_components():
+    """Test that flip directions are computed correctly for all components."""
+    from analysis.svd_labels import compute_flip_direction
+
+    # Simulate party scores for 10 components
+    # Right parties should have positive scores on component 1 (EU-integratie)
+    # Left parties should have negative scores on component 1
+    party_scores = {
+        "VVD": [0.5] * 10,  # Right party, positive on all components
+        "PVV": [0.8] * 10,  # Right party
+        "SP": [-0.6] * 10,  # Left party, negative on all components
+        "DENK": [-0.4] * 10,  # Left party
+    }
+
+    # For all components, right_mean > left_mean, so flip should be False
+    for comp in range(1, 11):
+        flip = compute_flip_direction(comp, party_scores)
+        assert flip is False, f"Component {comp} should not flip"
+
+    # Now test with right parties on left (negative scores)
+    party_scores_left = {
+        "VVD": [-0.5] * 10,
+        "PVV": [-0.8] * 10,
+        "SP": [0.6] * 10,
+        "DENK": [0.4] * 10,
+    }
+
+    # For all components, right_mean < left_mean, so flip should be True
+    for comp in range(1, 11):
+        flip = compute_flip_direction(comp, party_scores_left)
+        assert flip is True, f"Component {comp} should flip"