Initial build out

tests/test_irs990_download.py

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+import admin_analytics.config as config
+from admin_analytics.irs990.download import filter_index
+
+
+def test_filter_index(fixtures_dir, tmp_path):
+    """Test that index filtering finds UD filings and skips 990T."""
+    # Create a mock index CSV
+    index = tmp_path / "index_2023.csv"
+    index.write_text(
+        "RETURN_ID,FILING_TYPE,EIN,TAX_PERIOD,SUB_DATE,TAXPAYER_NAME,RETURN_TYPE,DLN,OBJECT_ID\n"
+        "1,EFILE,516000297,202206,2023,UNIVERSITY OF DELAWARE,990,123,OBJ001\n"
+        "2,EFILE,516000297,202206,2023,UNIVERSITY OF DELAWARE,990T,456,OBJ002\n"
+        "3,EFILE,516017306,202212,2023,UNIVERSITY OF DELAWARE RESEARCH FOUNDATION,990,789,OBJ003\n"
+        "4,EFILE,999999999,202212,2023,SOME OTHER ORG,990,000,OBJ004\n"
+    )
+
+    result = filter_index(index, config.UD_EINS)
+    assert result.height == 2  # UD 990 + Research Foundation 990, not 990T
+
+    eins = result["EIN"].to_list()
+    assert "516000297" in eins
+    assert "516017306" in eins
+
+    # All should be type 990 (not 990T)
+    assert all(rt == "990" for rt in result["RETURN_TYPE"].to_list())