parser: test: add some tests

src/parser.rs

@@ -54,3 +54,36 @@ pub fn match_pattern(
 
     Ok(Matches { items: matches, pattern: String::from(pattern) })
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_get_file_name_from_path() {
+        let path = "/path/to/file.txt";
+        let file_name = get_file_name_from_path(path);
+        assert_eq!(file_name, "file.txt");
+
+        let path = "file.txt";
+        let file_name = get_file_name_from_path(path);
+        assert_eq!(file_name, "file.txt");
+    }
+
+    #[test]
+    fn matches_lines_and_tracks_line_numbers() {
+        let input: Vec<std::io::Result<String>> =
+            vec![Ok("hola".into()), Ok("no".into()), Ok("hola again".into())];
+
+        let result = match_pattern(input.into_iter(), r"^hola", "/tmp/test.txt").unwrap();
+
+        assert_eq!(result.items.len(), 2);
+
+        assert_eq!(result.items[0].text, "hola");
+        assert_eq!(result.items[0].line_number, 1);
+        assert_eq!(result.items[0].file_name, "test.txt");
+
+        assert_eq!(result.items[1].text, "hola again");
+        assert_eq!(result.items[1].line_number, 3);
+    }
+}