208 lines
6.9 KiB
Python
208 lines
6.9 KiB
Python
"""
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Unit tests for duplicate detection and deduplication logic.
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Tests cover:
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- _exists() method correctly identifies existing S3 keys
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- S3 key generation follows expected pattern
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- Storage layer skips upload when artifact already exists
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- Storage layer performs upload when artifact does not exist
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"""
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import pytest
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import io
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from unittest.mock import MagicMock, patch
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from tests.conftest import (
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compute_sha256,
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TEST_CONTENT_HELLO,
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TEST_HASH_HELLO,
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)
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class TestExistsMethod:
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"""Tests for the _exists() method that checks S3 object existence."""
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@pytest.mark.unit
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def test_exists_returns_true_for_existing_key(self, mock_storage, mock_s3_client):
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"""Test _exists() returns True when object exists."""
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# Pre-populate the mock storage
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test_key = "fruits/df/fd/test-hash"
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mock_s3_client.objects[test_key] = b"content"
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result = mock_storage._exists(test_key)
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assert result is True
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@pytest.mark.unit
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def test_exists_returns_false_for_nonexistent_key(self, mock_storage):
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"""Test _exists() returns False when object doesn't exist."""
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result = mock_storage._exists("fruits/no/ne/nonexistent-key")
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assert result is False
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@pytest.mark.unit
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def test_exists_handles_404_error(self, mock_storage):
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"""Test _exists() handles 404 errors gracefully."""
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# The mock client raises ClientError for nonexistent keys
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result = mock_storage._exists("fruits/xx/yy/does-not-exist")
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assert result is False
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class TestS3KeyGeneration:
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"""Tests for S3 key pattern generation."""
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@pytest.mark.unit
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def test_s3_key_pattern(self):
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"""Test S3 key follows pattern: fruits/{hash[:2]}/{hash[2:4]}/{hash}"""
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test_hash = "abcdef1234567890abcdef1234567890abcdef1234567890abcdef1234567890"
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expected_key = f"fruits/{test_hash[:2]}/{test_hash[2:4]}/{test_hash}"
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# Expected: fruits/ab/cd/abcdef1234567890...
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assert expected_key == f"fruits/ab/cd/{test_hash}"
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@pytest.mark.unit
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def test_s3_key_generation_in_storage(self, mock_storage):
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"""Test storage layer generates correct S3 key."""
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content = TEST_CONTENT_HELLO
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file_obj = io.BytesIO(content)
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result = mock_storage._store_simple(file_obj)
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expected_key = (
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f"fruits/{TEST_HASH_HELLO[:2]}/{TEST_HASH_HELLO[2:4]}/{TEST_HASH_HELLO}"
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)
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assert result.s3_key == expected_key
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@pytest.mark.unit
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def test_s3_key_uses_sha256_hash(self, mock_storage):
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"""Test S3 key is derived from SHA256 hash."""
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content = b"unique test content for key test"
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file_obj = io.BytesIO(content)
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expected_hash = compute_sha256(content)
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result = mock_storage._store_simple(file_obj)
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# Key should contain the hash
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assert expected_hash in result.s3_key
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class TestDeduplicationBehavior:
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"""Tests for deduplication (skip upload when exists)."""
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@pytest.mark.unit
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def test_skips_upload_when_exists(self, mock_storage, mock_s3_client):
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"""Test storage skips S3 upload when artifact already exists."""
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content = TEST_CONTENT_HELLO
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s3_key = (
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f"fruits/{TEST_HASH_HELLO[:2]}/{TEST_HASH_HELLO[2:4]}/{TEST_HASH_HELLO}"
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)
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# Pre-populate storage (simulate existing artifact)
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mock_s3_client.objects[s3_key] = content
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# Track put_object calls
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original_put = mock_s3_client.put_object
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put_called = []
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def tracked_put(*args, **kwargs):
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put_called.append(True)
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return original_put(*args, **kwargs)
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mock_s3_client.put_object = tracked_put
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# Store the same content
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file_obj = io.BytesIO(content)
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result = mock_storage._store_simple(file_obj)
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# put_object should NOT have been called (deduplication)
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assert len(put_called) == 0
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assert result.sha256 == TEST_HASH_HELLO
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@pytest.mark.unit
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def test_uploads_when_not_exists(self, mock_storage, mock_s3_client):
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"""Test storage uploads to S3 when artifact doesn't exist."""
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content = b"brand new unique content"
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content_hash = compute_sha256(content)
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s3_key = f"fruits/{content_hash[:2]}/{content_hash[2:4]}/{content_hash}"
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# Ensure object doesn't exist
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assert s3_key not in mock_s3_client.objects
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# Store the content
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file_obj = io.BytesIO(content)
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result = mock_storage._store_simple(file_obj)
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# Object should now exist in mock storage
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assert s3_key in mock_s3_client.objects
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assert mock_s3_client.objects[s3_key] == content
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@pytest.mark.unit
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def test_returns_same_hash_for_duplicate(self, mock_storage, mock_s3_client):
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"""Test storing same content twice returns same hash."""
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content = b"content to be stored twice"
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# First store
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file1 = io.BytesIO(content)
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result1 = mock_storage._store_simple(file1)
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# Second store (duplicate)
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file2 = io.BytesIO(content)
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result2 = mock_storage._store_simple(file2)
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assert result1.sha256 == result2.sha256
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assert result1.s3_key == result2.s3_key
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@pytest.mark.unit
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def test_different_content_different_keys(self, mock_storage):
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"""Test different content produces different S3 keys."""
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content1 = b"first content"
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content2 = b"second content"
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file1 = io.BytesIO(content1)
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result1 = mock_storage._store_simple(file1)
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file2 = io.BytesIO(content2)
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result2 = mock_storage._store_simple(file2)
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assert result1.sha256 != result2.sha256
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assert result1.s3_key != result2.s3_key
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class TestDeduplicationEdgeCases:
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"""Edge case tests for deduplication."""
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@pytest.mark.unit
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def test_same_content_different_filenames(self, mock_storage):
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"""Test same content with different metadata is deduplicated."""
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content = b"identical content"
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# Store with "filename1"
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file1 = io.BytesIO(content)
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result1 = mock_storage._store_simple(file1)
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# Store with "filename2" (same content)
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file2 = io.BytesIO(content)
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result2 = mock_storage._store_simple(file2)
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# Both should have same hash (content-addressable)
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assert result1.sha256 == result2.sha256
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@pytest.mark.unit
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def test_whitespace_only_difference(self, mock_storage):
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"""Test content differing only by whitespace produces different hashes."""
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content1 = b"test content"
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content2 = b"test content" # Extra space
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content3 = b"test content " # Trailing space
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file1 = io.BytesIO(content1)
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file2 = io.BytesIO(content2)
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file3 = io.BytesIO(content3)
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result1 = mock_storage._store_simple(file1)
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result2 = mock_storage._store_simple(file2)
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result3 = mock_storage._store_simple(file3)
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# All should be different (content-addressable)
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assert len({result1.sha256, result2.sha256, result3.sha256}) == 3
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