init

crates/domain/tests/attachment/media_upload_test.rs

@@ -0,0 +1,19 @@
+use domain::attachment::{ContentType, MediaUpload};
+use domain::errors::DomainError;
+
+#[test]
+fn valid_upload_is_created() {
+    let ct = ContentType::new("image/png").unwrap();
+    let upload = MediaUpload::new(vec![1, 2, 3], ct).unwrap();
+
+    assert_eq!(upload.data(), &[1, 2, 3]);
+    assert_eq!(upload.content_type().value(), "image/png");
+    assert_eq!(upload.size(), 3);
+}
+
+#[test]
+fn empty_data_is_rejected() {
+    let ct = ContentType::new("image/png").unwrap();
+    let result = MediaUpload::new(vec![], ct);
+    assert!(matches!(result, Err(DomainError::InvalidInput(_))));
+}