test: testing welds feature

tests/feature_testing/mod.rs

@@ -1,4 +1,6 @@
 #[cfg(feature = "openapi")]
 mod openapi;
 #[cfg(feature = "builder")]
-mod builder;
+mod builder;
+#[cfg(feature = "welds")]
+mod welds;

tests/feature_testing/welds.rs

@@ -0,0 +1,48 @@
+use restructed::Models;
+use welds::state::DbState;
+
+#[derive(Models, Clone, PartialEq, Eq, Debug)]
+#[patch(UserUpdatables, omit(id), default_derives = true)]
+#[view(UserId, fields(id))]
+struct User {
+    id: i32,
+    display_name: String,
+    bio: String,
+    password: String,
+}
+
+impl User {
+    pub fn new() -> Self {
+        User {
+            id: 123,
+            display_name: "Cool Doode".to_string(),
+            bio: "I'm a cool doode, what can I say?".to_string(),
+            password: "Pls don't hack me".to_string(),
+        }
+    }
+}
+
+#[test]
+fn can_build() {
+    let user = User::new();
+
+    let id = UserId::builder()
+        .id(user.id)
+        .build();
+    assert_eq!(&id.id, &user.id);
+
+    let patch = UserUpdatables::builder()
+        .display_name(Some("Cooler doode".to_string()))
+        .bio(None)
+        .password(Some("Can't hack 'dis".to_string()))
+        .build();
+
+    let mut state = DbState::new_uncreated(user.clone());
+    patch.merge_weld_mut(&mut state);
+
+
+    assert_ne!(*state, user);
+    assert_eq!(*state.display_name, "Cooler doode".to_string());
+    assert_eq!(*state.bio, "I'm a cool doode, what can I say?".to_string());
+    assert_eq!(*state.password, "Can't hack 'dis".to_string());
+}