Improve testing.

Author: fniephaus

.github/workflows/graaljs-micronaut-react-ssr.yml

@@ -30,13 +30,12 @@ jobs:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           cache: 'maven'
 
-      - name: Build and run Micronaut app
+      - name: Build, test, and run Micronaut app
         run: |
           cd graaljs/graaljs-micronaut-react-ssr
-          ./mvnw clean package -DskipTests
-          ./mvnw mn:run &
-
-      - name: Verify application is running
-        run: |
-          sleep 30
+          ./mvnw --no-transfer-progress clean package
+          ./mvnw --no-transfer-progress mn:run &
+          mnpid="$!"
+          sleep 10
           curl --fail-with-body --silent --dump-header - -o /dev/null http://localhost:8080
+          kill $mnpid

graaljs/graaljs-micronaut-react-ssr/src/test/java/com/example/ReactViewTest.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2025, Oracle and/or its affiliates.
+ *
+ * Licensed under the Universal Permissive License v 1.0 as shown at https://opensource.org/license/UPL.
+ */
+
+package com.example;
+
+import io.micronaut.http.client.HttpClient;
+import io.micronaut.http.client.annotation.Client;
+import io.micronaut.test.extensions.junit5.annotation.MicronautTest;
+import jakarta.inject.Inject;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+@MicronautTest
+public class ReactViewTest {
+    @Inject
+    @Client("/")
+    HttpClient client;
+
+    @Test
+    void rootViewRendersServerSide() {
+        var html = client.toBlocking().exchange("/", String.class).body();
+
+        // Check that title is correctly rendered
+        assertTrue(html.contains("<title>Recharts Examples</title>"), "Title not set correctly");
+
+        // Check the embedded rootProps and rootComponent in the script tag
+        assertTrue(html.contains("\"rootProps\":{\"width\":500,\"title\":\"Recharts Examples\",\"height\":300,\"url\":\"/\"}"), "rootProps not set correctly");
+        assertTrue(html.contains("\"rootComponent\":\"App\""), "rootComponent not set correctly");
+
+        // Check SVG elements
+        assertEquals(11, countOccurrences(html, "<svg"), "Number of SVG elements incorrect");
+    }
+
+    private static int countOccurrences(String str, String subStr) {
+        int count = 0;
+        int index = 0;
+
+        while ((index = str.indexOf(subStr, index)) != -1) {
+            count++;
+            index += subStr.length(); // Move past the last found substring
+        }
+
+        return count;
+    }
+}