added in file type tests

test_files/invalit.txt

@@ -0,0 +1 @@
+invalid file for testing

tests/duckdb_tests.rs

@@ -1,6 +1,54 @@
-// use duckdb_transformer::duckdb_load::duckdb_transform;
+use duckdb_transformer::duckdb_load::process_file;
+use std::path::Path;
+
+const TEST_FILES_DIR: &str = "test_files";
+
+fn test_file_path(file_name: &str) -> String {
+    Path::new(TEST_FILES_DIR)
+        .join(file_name)
+        .to_str()
+        .unwrap()
+        .to_string()
+}
+
+#[test]
+fn test_process_geojson() {
+    let file_path = test_file_path("hotosm_twn_populated_places_points_geojson.geojson");
+    assert!(process_file(&file_path).is_ok());
+}
+
+#[test]
+fn test_process_geopackage() {
+    let file_path = test_file_path("GLA_High_Street_boundaries.gpkg");
+    assert!(process_file(&file_path).is_ok());
+}
+
+// #[test]
+// fn test_process_shapefile() {
+//     let file_path = test_file_path("your_shapefile.shp");
+//     assert!(process_file(&file_path).is_ok());
+// }
 
 // #[test]
-// fn test_duckdb_transform() {
-//     assert!(duckdb_transform().is_ok())
+// fn test_process_excel() {
+//     let file_path = test_file_path("your_excel_file.xlsx");
+//     assert!(process_file(&file_path).is_ok());
 // }
+
+// #[test]
+// fn test_process_csv() {
+//     let file_path = test_file_path("your_csv_file.csv");
+//     assert!(process_file(&file_path).is_ok());
+// }
+
+// #[test]
+// fn test_process_parquet() {
+//     let file_path = test_file_path("your_parquet_file.parquet");
+//     assert!(process_file(&file_path).is_ok());
+// }
+
+#[test]
+fn test_process_invalid_file() {
+    let file_path = test_file_path("invalid.txt");
+    assert!(process_file(&file_path).is_err());
+}