only subscribe scopes to signals when rendering

packages/signals/tests/create.rs

@@ -0,0 +1,85 @@
+#![allow(unused, non_upper_case_globals, non_snake_case)]
+
+use dioxus_core::NoOpMutations;
+use dioxus::prelude::*;
+use dioxus_core::ElementId;
+use dioxus_signals::*;
+
+#[test]
+fn create_signals_global() {
+    let mut dom = VirtualDom::new(|| {
+        rsx! {
+            for _ in 0..10 {
+                Child {}
+            }
+        }
+    });
+
+    fn Child() -> Element {
+        let signal = create_without_cx();
+
+        rsx! {
+            "{signal}"
+        }
+    }
+
+    dom.rebuild_in_place();
+
+    fn create_without_cx() -> Signal<String> {
+        Signal::new("hello world".to_string())
+    }
+}
+
+#[test]
+fn deref_signal() {
+    let mut dom = VirtualDom::new(|| {
+        rsx! {
+            for _ in 0..10 {
+                Child {}
+            }
+        }
+    });
+
+    fn Child() -> Element {
+        let signal = Signal::new("hello world".to_string());
+
+        // You can call signals like functions to get a Ref of their value.
+        assert_eq!(&*signal(), "hello world");
+
+        rsx! {
+            "hello world"
+        }
+    }
+
+    dom.rebuild_in_place();
+}
+
+#[test]
+fn drop_signals() {
+    let mut dom = VirtualDom::new(|| {
+        let generation = generation();
+
+        let count = if generation % 2 == 0 { 10 } else { 0 };
+        rsx! {
+            for _ in 0..count {
+                Child {}
+            }
+        }
+    });
+
+    fn Child() -> Element {
+        let signal = create_without_cx();
+
+        rsx! {
+            "{signal}"
+        }
+    }
+
+    dom.rebuild_in_place();
+    dom.mark_dirty(ScopeId::ROOT);
+    dom.render_immediate(&mut NoOpMutations);
+
+    fn create_without_cx() -> Signal<String> {
+        Signal::new("hello world".to_string())
+    }
+}