update wasm-bindgen testing approaches

examples/counter/Cargo.toml

@@ -18,3 +18,4 @@ console_error_panic_hook = "0.1.7"
 wasm-bindgen = "0.2"
 wasm-bindgen-test = "0.3.0"
 web-sys = "0.3"
+gloo-timers = { version = "0.3", features = ["futures"] }

examples/counter/tests/web.rs

@@ -1,19 +1,21 @@
 use counter::*;
-use leptos::*;
+use gloo_timers::future::TimeoutFuture;
+use leptos::mount::mount_to;
+use leptos::prelude::*;
 use wasm_bindgen::JsCast;
 use wasm_bindgen_test::*;
 
 wasm_bindgen_test_configure!(run_in_browser);
 
 #[wasm_bindgen_test]
-fn clear() {
+async fn clear() {
-    let document = leptos::document();
+    let document = document();
     let test_wrapper = document.create_element("section").unwrap();
     let _ = document.body().unwrap().append_child(&test_wrapper);
 
     // start by rendering our counter and mounting it to the DOM
     // note that we start at the initial value of 10
-    mount_to(
+    let _dispose = mount_to(
         test_wrapper.clone().unchecked_into(),
         || view! { <SimpleCounter initial_value=10 step=1/> },
     );
@@ -30,59 +32,63 @@ fn clear() {
     // now let's click the `clear` button
     clear.click();
 
+    // the reactive system is built on top of the async system, so changes are not reflected
+    // synchronously in the DOM
+    // in order to detect the changes here, we'll just yield for a brief time after each change,
+    // allowing the effects that update the view to run
+    TimeoutFuture::new(10).await;
+
     // now let's test the <div> against the expected value
     // we can do this by testing its `outerHTML`
-    let runtime = create_runtime();
+    assert_eq!(div.outer_html(), {
-    assert_eq!(
+        // it's as if we're creating it with a value of 0, right?
-        div.outer_html(),
+        let (value, _set_value) = signal(0);
-        // here we spawn a mini reactive system, just to render the
-        // test case
-        {
-            // it's as if we're creating it with a value of 0, right?
-            let (value, _set_value) = create_signal(0);
 
-            // we can remove the event listeners because they're not rendered to HTML
+        // we can remove the event listeners because they're not rendered to HTML
-            view! {
+        view! {
-                <div>
+            <div>
-                    <button>"Clear"</button>
+                <button>"Clear"</button>
-                    <button>"-1"</button>
+                <button>"-1"</button>
-                    <span>"Value: " {value} "!"</span>
+                <span>"Value: " {value} "!"</span>
-                    <button>"+1"</button>
+                <button>"+1"</button>
-                </div>
+            </div>
-            }
-            // the view returned an HtmlElement<Div>, which is a smart pointer for
-            // a DOM element. So we can still just call .outer_html()
-            .outer_html()
         }
-    );
+        // Leptos supports multiple backend renderers for HTML elements
+        // .into_view() here is just a convenient way of specifying "use the regular DOM renderer"
+        .into_view()
+        // views are lazy -- they describe a DOM tree but don't create it yet
+        // calling .build() will actually build the DOM elements
+        .build()
+        // .build() returned an ElementState, which is a smart pointer for
+        // a DOM element. So we can still just call .outer_html(), which access the outerHTML on
+        // the actual DOM element
+        .outer_html()
+    });
 
     // There's actually an easier way to do this...
     // We can just test against a <SimpleCounter/> with the initial value 0
     assert_eq!(test_wrapper.inner_html(), {
         let comparison_wrapper = document.create_element("section").unwrap();
-        leptos::mount_to(
+        let _dispose = mount_to(
             comparison_wrapper.clone().unchecked_into(),
             || view! { <SimpleCounter initial_value=0 step=1/>},
         );
         comparison_wrapper.inner_html()
     });
-
-    runtime.dispose();
 }
 
 #[wasm_bindgen_test]
-fn inc() {
+async fn inc() {
-    let document = leptos::document();
+    let document = document();
     let test_wrapper = document.create_element("section").unwrap();
     let _ = document.body().unwrap().append_child(&test_wrapper);
 
-    mount_to(
+    let _dispose = mount_to(
         test_wrapper.clone().unchecked_into(),
         || view! { <SimpleCounter initial_value=0 step=1/> },
     );
 
     // You can do testing with vanilla DOM operations
-    let _document = leptos::document();
     let div = test_wrapper.query_selector("div").unwrap().unwrap();
     let clear = div
         .first_child()
@@ -108,6 +114,8 @@ fn inc() {
     inc.click();
     inc.click();
 
+    TimeoutFuture::new(10).await;
+
     assert_eq!(text.text_content(), Some("Value: 2!".to_string()));
 
     dec.click();
@@ -115,19 +123,21 @@ fn inc() {
     dec.click();
     dec.click();
 
+    TimeoutFuture::new(10).await;
+
     assert_eq!(text.text_content(), Some("Value: -2!".to_string()));
 
     clear.click();
 
-    assert_eq!(text.text_content(), Some("Value: 0!".to_string()));
+    TimeoutFuture::new(10).await;
 
-    let runtime = create_runtime();
+    assert_eq!(text.text_content(), Some("Value: 0!".to_string()));
 
     // Or you can test against a sample view!
     assert_eq!(
         div.outer_html(),
         {
-            let (value, _) = create_signal(0);
+            let (value, _) = signal(0);
             view! {
                 <div>
                     <button>"Clear"</button>
@@ -137,16 +147,20 @@ fn inc() {
                 </div>
             }
         }
+        .into_view()
+        .build()
         .outer_html()
     );
 
     inc.click();
 
+    TimeoutFuture::new(10).await;
+
     assert_eq!(
         div.outer_html(),
         {
             // because we've clicked, it's as if the signal is starting at 1
-            let (value, _) = create_signal(1);
+            let (value, _) = signal(1);
             view! {
                 <div>
                     <button>"Clear"</button>
@@ -156,8 +170,8 @@ fn inc() {
                 </div>
             }
         }
+        .into_view()
+        .build()
         .outer_html()
     );
-
-    runtime.dispose();
 }

examples/counter_without_macros/Cargo.toml

@@ -10,8 +10,6 @@ lto = true
 
 [dependencies]
 leptos = { path = "../../leptos" }
-console_log = "1"
-log = "0.4"
 console_error_panic_hook = "0.1.7"
 
 [dev-dependencies]
@@ -19,6 +17,7 @@ wasm-bindgen = "0.2"
 wasm-bindgen-test = "0.3.34"
 pretty_assertions = "1.3.0"
 rstest = "0.17.0"
+gloo-timers = { version = "0.3", features = ["futures"] }
 
 [dev-dependencies.web-sys]
 features = ["HtmlElement", "XPathResult"]

examples/counter_without_macros/src/main.rs

@@ -1,9 +1,7 @@
 use counter_without_macros::counter;
-use leptos::*;
 
 /// Show the counter
 pub fn main() {
-    _ = console_log::init_with_level(log::Level::Debug);
     console_error_panic_hook::set_once();
-    mount::mount_to_body(|| counter(0, 1))
+    leptos::mount::mount_to_body(|| counter(0, 1))
 }

examples/counter_without_macros/tests/web.rs

@@ -1,5 +1,6 @@
 use counter_without_macros::counter;
-use leptos::*;
+use gloo_timers::future::TimeoutFuture;
+use leptos::prelude::*;
 use pretty_assertions::assert_eq;
 use wasm_bindgen::JsCast;
 use wasm_bindgen_test::*;
@@ -8,27 +9,32 @@ use web_sys::HtmlElement;
 wasm_bindgen_test_configure!(run_in_browser);
 
 #[wasm_bindgen_test]
-fn should_increment_counter() {
+async fn should_increment_counter() {
     open_counter();
 
     click_increment();
     click_increment();
 
+    // reactive changes run asynchronously, so yield briefly before observing the DOM
+    TimeoutFuture::new(10).await;
+
     assert_eq!(see_text(), Some("Value: 2!".to_string()));
 }
 
 #[wasm_bindgen_test]
-fn should_decrement_counter() {
+async fn should_decrement_counter() {
     open_counter();
 
     click_decrement();
     click_decrement();
 
+    TimeoutFuture::new(10).await;
+
     assert_eq!(see_text(), Some("Value: -2!".to_string()));
 }
 
 #[wasm_bindgen_test]
-fn should_clear_counter() {
+async fn should_clear_counter() {
     open_counter();
 
     click_increment();
@@ -36,18 +42,18 @@ fn should_clear_counter() {
 
     click_clear();
 
+    TimeoutFuture::new(10).await;
+
     assert_eq!(see_text(), Some("Value: 0!".to_string()));
 }
 
 fn open_counter() {
     remove_existing_counter();
-    mount_to_body(move || counter(0, 1));
+    leptos::mount::mount_to_body(move || counter(0, 1));
 }
 
 fn remove_existing_counter() {
-    if let Some(counter) =
+    if let Some(counter) = document().query_selector("body div").unwrap() {
-        leptos::document().query_selector("body div").unwrap()
-    {
         counter.remove();
     }
 }
@@ -74,7 +80,7 @@ fn see_text() -> Option<String> {
 
 fn find_by_text(text: &str) -> HtmlElement {
     let xpath = format!("//*[text()='{}']", text);
-    let document = leptos::document();
+    let document = document();
     document
         .evaluate(&xpath, &document)
         .unwrap()

tachys/src/html/element/mod.rs

@@ -12,7 +12,7 @@ use const_str_slice_concat::{
     const_concat, const_concat_with_prefix, str_from_buffer,
 };
 use next_tuple::NextTuple;
-use std::marker::PhantomData;
+use std::{marker::PhantomData, ops::Deref};
 
 mod custom;
 mod elements;
@@ -413,6 +413,14 @@ pub struct ElementState<At, Ch, R: Renderer> {
     rndr: PhantomData<R>,
 }
 
+impl<At, Ch, R: Renderer> Deref for ElementState<At, Ch, R> {
+    type Target = R::Element;
+
+    fn deref(&self) -> &Self::Target {
+        &self.el
+    }
+}
+
 impl<At, Ch, R> Mountable<R> for ElementState<At, Ch, R>
 where
     R: Renderer,