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import pytest
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import pandas as pd
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from pandas.errors import ParserError
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from unittest.mock import patch, mock_open
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from app.dataloader import load_data
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@pytest.fixture
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def valid_metadata_file():
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"""Fixture to provide valid metadata CSV content."""
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return """SubjectID,OtherInfo
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1,Info1
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2,Info2
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3,Info3
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"""
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@pytest.fixture
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def valid_proteins_file():
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"""Fixture to provide valid proteins CSV content."""
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return (
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"SampleId,TargetFullName,Target,EntrezGeneID,EntrezGeneSymbol"
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"1,Protein A,A,101,GA"
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"2,Protein B,B,102,GB"
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"3,Protein C,C,103,GC"
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)
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@pytest.fixture
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def invalid_file_content():
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"""Fixture for invalid file content (non-CSV)."""
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return "Invalid Content"
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def test_load_data_valid_files(valid_metadata_file, valid_proteins_file):
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"""Test that load_data loads valid CSV files correctly."""
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with patch("pandas.read_csv") as mock_read_csv:
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mock_read_csv.side_effect = [
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pd.DataFrame({"SubjectID": [1, 2, 3], "OtherInfo": ["Info1", "Info2", "Info3"]}),
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pd.DataFrame({
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"SampleId": [1, 2, 3],
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"TargetFullName": ["Protein A", "Protein B", "Protein C"],
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"Target": ["A", "B", "C"],
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"EntrezGeneID": [101, 102, 103],
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"EntrezGeneSymbol": ["GA", "GB", "GC"]
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}),
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]
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metadata, proteins = load_data("metadata.csv", "proteins.csv")
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assert not metadata.empty
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assert not proteins.empty
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assert list(metadata.columns) == ["SubjectID", "OtherInfo"]
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assert list(proteins.columns) == ["SampleId", "TargetFullName", "Target", "EntrezGeneID", "EntrezGeneSymbol"]
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def test_load_data_invalid_file_path():
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"""Test that load_data raises ValueError for invalid file paths."""
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with pytest.raises(ValueError, match="Error loading files"):
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load_data("invalid_metadata.csv", "invalid_proteins.csv")
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def test_load_data_invalid_file_content():
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"""Test that load_data raises ValueError for invalid file content."""
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with patch("pandas.read_csv", side_effect=ParserError("Error parsing file")):
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with pytest.raises(ValueError, match="Error loading files"):
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load_data("metadata.csv", "proteins.csv")
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def test_load_data_empty_files():
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"""Test that load_data handles empty files correctly."""
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with patch("pandas.read_csv") as mock_read_csv:
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mock_read_csv.side_effect = [pd.DataFrame(), pd.DataFrame()]
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metadata, proteins = load_data("metadata.csv", "proteins.csv")
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assert metadata.empty
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assert proteins.empty
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