Write documentation for iced_test

examples/counter/Cargo.toml

@@ -11,3 +11,6 @@ iced.workspace = true
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 iced.workspace = true
 iced.features = ["webgl", "fira-sans"]
+
+[dev-dependencies]
+iced_test.workspace = true

examples/counter/src/main.rs

@@ -38,3 +38,32 @@ impl Counter {
         .align_x(Center)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use iced_test::selector::text;
+    use iced_test::{simulator, Error};
+
+    #[test]
+    fn it_counts() -> Result<(), Error> {
+        let mut counter = Counter { value: 0 };
+        let mut ui = simulator(counter.view());
+
+        let _ = ui.click(text("Increment"));
+        let _ = ui.click(text("Increment"));
+        let _ = ui.click(text("Decrement"));
+
+        for message in ui.into_messages() {
+            counter.update(message);
+        }
+
+        assert_eq!(counter.value, 1);
+
+        let mut ui = simulator(counter.view());
+
+        assert!(ui.find(text("1")).is_ok(), "Counter should display 1!");
+
+        Ok(())
+    }
+}