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Unit tests for WikiData loader.
Note: These tests require the data files to be present. Tests will be
skipped if data files are missing.
"""
import numpy as np
import pytest
from src.config import EMBEDDING_DIM, validate_data_files
# Skip all tests if data files are missing
pytestmark = pytest.mark.skipif(
not all(validate_data_files().values()),
reason="Data files not available",
)
@pytest.fixture(scope="module")
def wiki_data():
"""Load wiki_data once for all tests in this module."""
from src.data import wiki_data
# Trigger loading
_ = wiki_data.article_count()
return wiki_data
class TestCoreAccessors:
"""Test core accessor methods."""
def test_article_count_positive(self, wiki_data):
"""Article count should be positive."""
assert wiki_data.article_count() > 0
def test_traversable_count_positive(self, wiki_data):
"""Traversable count should be positive."""
assert wiki_data.traversable_count() > 0
def test_traversable_less_than_total(self, wiki_data):
"""Traversable count should be less than total (not all have links)."""
assert wiki_data.traversable_count() <= wiki_data.article_count()
def test_get_title_valid_index(self, wiki_data):
"""Should return title for valid index."""
title = wiki_data.get_title(0)
assert isinstance(title, str)
def test_get_title_invalid_index_raises(self, wiki_data):
"""Should raise IndexError for invalid index."""
with pytest.raises(IndexError):
wiki_data.get_title(-1)
with pytest.raises(IndexError):
wiki_data.get_title(999_999_999)
def test_get_index_known_article(self, wiki_data):
"""Should return index for known article."""
idx = wiki_data.get_index("Albert Einstein")
assert idx is not None
assert isinstance(idx, int)
assert idx >= 0
def test_get_index_unknown_article(self, wiki_data):
"""Should return None for unknown article."""
idx = wiki_data.get_index("ZZZZZ_NOT_A_REAL_ARTICLE_12345")
assert idx is None
def test_has_article_true(self, wiki_data):
"""Should return True for existing article."""
assert wiki_data.has_article("Albert Einstein") is True
def test_has_article_false(self, wiki_data):
"""Should return False for non-existing article."""
assert wiki_data.has_article("ZZZZZ_NOT_A_REAL_ARTICLE_12345") is False
def test_is_traversable_true(self, wiki_data):
"""Should return True for article with outgoing links."""
# Albert Einstein should have links
assert wiki_data.is_traversable("Albert Einstein") is True
def test_is_traversable_false_nonexistent(self, wiki_data):
"""Should return False for non-existent article."""
assert wiki_data.is_traversable("ZZZZZ_NOT_A_REAL_ARTICLE_12345") is False
class TestEmbeddingAccessors:
"""Test embedding accessor methods."""
def test_get_embedding_valid(self, wiki_data):
"""Should return embedding for valid article."""
emb = wiki_data.get_embedding("Albert Einstein")
assert emb is not None
assert isinstance(emb, np.ndarray)
assert emb.shape == (EMBEDDING_DIM,)
def test_get_embedding_invalid(self, wiki_data):
"""Should return None for invalid article."""
emb = wiki_data.get_embedding("ZZZZZ_NOT_A_REAL_ARTICLE_12345")
assert emb is None
def test_get_embedding_by_idx(self, wiki_data):
"""Should return embedding by index."""
idx = wiki_data.get_index("Albert Einstein")
emb = wiki_data.get_embedding_by_idx(idx)
assert isinstance(emb, np.ndarray)
assert emb.shape == (EMBEDDING_DIM,)
def test_get_normalized_embedding(self, wiki_data):
"""Should return normalized embedding (L2 norm ~= 1)."""
emb = wiki_data.get_normalized_embedding("Albert Einstein")
assert emb is not None
norm = np.linalg.norm(emb)
assert 0.99 < norm < 1.01 # Should be approximately 1
def test_get_embeddings_batch(self, wiki_data):
"""Should return batch of embeddings."""
titles = ["Albert Einstein", "Physics", "Mathematics"]
batch = wiki_data.get_embeddings_batch(titles)
assert isinstance(batch, np.ndarray)
assert batch.shape == (3, EMBEDDING_DIM)
def test_get_embeddings_batch_partial(self, wiki_data):
"""Should handle batch with some invalid titles."""
titles = ["Albert Einstein", "INVALID_ARTICLE", "Physics"]
batch = wiki_data.get_embeddings_batch(titles)
assert batch.shape[0] == 2 # Only 2 valid
class TestSimilarityFunctions:
"""Test similarity computation methods."""
def test_similarity_valid(self, wiki_data):
"""Should return similarity for valid articles."""
sim = wiki_data.similarity("Physics", "Mathematics")
assert sim is not None
assert isinstance(sim, float)
assert -1 <= sim <= 1 # Cosine similarity range
def test_similarity_invalid(self, wiki_data):
"""Should return None if either article is invalid."""
assert wiki_data.similarity("Physics", "INVALID") is None
assert wiki_data.similarity("INVALID", "Physics") is None
def test_similarity_self(self, wiki_data):
"""Similarity of article with itself should be ~1."""
sim = wiki_data.similarity("Albert Einstein", "Albert Einstein")
assert sim is not None
assert sim > 0.99
def test_similarity_semantic_ordering(self, wiki_data):
"""Related articles should be more similar than unrelated."""
sim_related = wiki_data.similarity("Physics", "Mathematics")
sim_unrelated = wiki_data.similarity("Physics", "Pizza")
assert sim_related is not None
assert sim_unrelated is not None
assert sim_related > sim_unrelated
def test_rank_by_similarity(self, wiki_data):
"""Should rank candidates by similarity."""
candidates = ["Mathematics", "Pizza", "Chemistry"]
ranked = wiki_data.rank_by_similarity(candidates, "Physics")
assert len(ranked) == 3
assert all(isinstance(r, tuple) and len(r) == 2 for r in ranked)
# Check sorted descending
sims = [r[1] for r in ranked]
assert sims == sorted(sims, reverse=True)
def test_rank_by_similarity_empty(self, wiki_data):
"""Should return empty list for invalid target."""
ranked = wiki_data.rank_by_similarity(["Physics"], "INVALID")
assert ranked == []
def test_nearest_neighbors(self, wiki_data):
"""Should return nearest neighbors."""
neighbors = wiki_data.nearest_neighbors("Physics", k=5)
assert len(neighbors) == 5
assert all(isinstance(n, tuple) and len(n) == 2 for n in neighbors)
# Should not include self
assert all(n[0] != "Physics" for n in neighbors)
def test_nearest_neighbors_invalid(self, wiki_data):
"""Should return empty list for invalid article."""
neighbors = wiki_data.nearest_neighbors("INVALID", k=5)
assert neighbors == []
class TestGraphAccessors:
"""Test graph accessor methods."""
def test_get_links_valid(self, wiki_data):
"""Should return links for valid traversable article."""
links = wiki_data.get_links("Albert Einstein")
assert isinstance(links, list)
assert len(links) > 0
assert all(isinstance(link, str) for link in links)
def test_get_links_invalid(self, wiki_data):
"""Should return empty list for invalid article."""
links = wiki_data.get_links("INVALID_ARTICLE_12345")
assert links == []
def test_get_links_by_idx(self, wiki_data):
"""Should return link indices."""
idx = wiki_data.get_index("Albert Einstein")
if wiki_data.is_traversable("Albert Einstein"):
links = wiki_data.get_links_by_idx(idx)
assert isinstance(links, list)
assert all(isinstance(i, int) for i in links)
def test_get_popularity(self, wiki_data):
"""Should return popularity (inbound link count)."""
# Popular articles should have high popularity
pop = wiki_data.get_popularity("United States")
assert isinstance(pop, int)
assert pop >= 0
# United States should be linked to by many articles
# Note: This test may be slow first time due to on-demand calculation
def test_get_popularity_invalid(self, wiki_data):
"""Should return 0 for invalid article."""
pop = wiki_data.get_popularity("INVALID_ARTICLE_12345")
assert pop == 0
class TestEdgeCases:
"""Test edge cases and error handling."""
def test_empty_string_title(self, wiki_data):
"""Should handle empty string gracefully."""
assert wiki_data.get_index("") is None or wiki_data.get_index("") is not None
# Just shouldn't crash
def test_unicode_title(self, wiki_data):
"""Should handle unicode titles."""
# Try some unicode - may or may not exist
wiki_data.get_index("日本") # Japan in Japanese
wiki_data.get_index("Москва") # Moscow in Russian
# Just shouldn't crash
def test_special_characters(self, wiki_data):
"""Should handle special characters in titles."""
wiki_data.get_index("C++")
wiki_data.get_index("AC/DC")
# Just shouldn't crash
class TestValidation:
"""Test validation and stats methods."""
def test_validate_all_pass(self, wiki_data):
"""All validation checks should pass."""
validation = wiki_data.validate()
assert all(validation.values()), f"Failed checks: {validation}"
def test_stats_complete(self, wiki_data):
"""Stats should include all expected keys."""
stats = wiki_data.stats()
expected_keys = [
"total_articles",
"traversable_articles",
"embedding_dim",
"embedding_dtype",
"faiss_vectors",
]
for key in expected_keys:
assert key in stats, f"Missing key: {key}"
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