code refactor

Reviewed-on: #26

crates/adapters/importer/tests/parsing_test.rs

@@ -0,0 +1,49 @@
+use domain::{
+    models::{FileFormat, ParsedFile},
+    ports::DocumentParser,
+};
+use importer::ImporterDocumentParser;
+
+fn parse_csv(data: &[u8]) -> Result<ParsedFile, domain::models::ImportError> {
+    ImporterDocumentParser.parse(data, FileFormat::Csv)
+}
+
+fn parse_json(data: &[u8]) -> Result<ParsedFile, domain::models::ImportError> {
+    ImporterDocumentParser.parse(data, FileFormat::Json)
+}
+
+#[test]
+fn csv_parses_headers_and_rows() {
+    let data = b"title,rating,watched_at\nInception,5,2024-01-01\nDune,4,2024-02-15\n";
+    let file = parse_csv(data).unwrap();
+    assert_eq!(file.columns, vec!["title", "rating", "watched_at"]);
+    assert_eq!(file.rows.len(), 2);
+    assert_eq!(file.rows[0], vec!["Inception", "5", "2024-01-01"]);
+}
+
+#[test]
+fn csv_rejects_empty() {
+    assert!(parse_csv(b"").is_err());
+}
+
+#[test]
+fn tsv_parses_correctly() {
+    let data = b"title\trating\nInception\t5\n";
+    let file = parse_csv(data).unwrap();
+    assert_eq!(file.columns, vec!["title", "rating"]);
+    assert_eq!(file.rows[0], vec!["Inception", "5"]);
+}
+
+#[test]
+fn json_array_of_objects() {
+    let data = br#"[{"title":"Inception","rating":"5"},{"title":"Dune","rating":"4"}]"#;
+    let file = parse_json(data).unwrap();
+    assert_eq!(file.columns.len(), 2);
+    assert!(file.columns.contains(&"title".to_string()));
+    assert_eq!(file.rows.len(), 2);
+}
+
+#[test]
+fn json_empty_array_errors() {
+    assert!(parse_json(b"[]").is_err());
+}