test(core): prepare for Spring Boot 4 and duplicate context issue

.github/workflows/ci.yml

@@ -55,6 +55,7 @@ jobs:
         demo:
           - spring-boot-3.4-maven
           - spring-boot-3.5-maven
+          - spring-boot-4.0-maven
 #          - spring-boot-3.5-maven-failsafe-parallel
 #          - spring-boot-3.5-maven-junit-parallel
 

.gitignore

@@ -122,7 +122,7 @@ $RECYCLE.BIN/
 PROMPTS.md
 VIDEO.md
 SCRIPT.md
-
+MARKETING.md
 
 ### JS ###
 coverage/

demo/spring-boot-3.5-maven/pom.xml

@@ -35,6 +35,11 @@
       <artifactId>spring-boot-starter-web</artifactId>
     </dependency>
 
+    <dependency>
+      <groupId>org.springframework.boot</groupId>
+      <artifactId>spring-boot-starter-actuator</artifactId>
+    </dependency>
+
     <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-data-jpa</artifactId>

demo/spring-boot-3.5-maven/src/main/resources/application.properties

@@ -9,3 +9,5 @@ spring.jpa.hibernate.ddl-auto=create-drop
 spring.jpa.show-sql=false
 # H2 Console (for development)
 spring.h2.console.enabled=true
+
+management.server.port=9090

demo/spring-boot-4.0-maven/.mvn/wrapper/maven-wrapper.properties

@@ -0,0 +1,19 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+wrapperVersion=3.3.2
+distributionType=only-script
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.10/apache-maven-3.9.10-bin.zip

demo/spring-boot-4.0-maven/README.md

@@ -0,0 +1,68 @@
+# Spring Test Insight Demo
+
+This demo project showcases the Spring Test Insight Extension in action.
+
+## Overview
+
+This is a simple Spring Boot application with:
+
+- REST API for user management
+- JPA/Hibernate with H2 in-memory database
+- Comprehensive test suite demonstrating Spring Test context caching
+
+## Running the Tests
+
+First, install the Spring Test Insight Extension to your local Maven repository:
+
+```bash
+cd ../spring-test-profiler-extension
+./mvnw clean install
+```
+
+Then run the demo tests:
+
+```bash
+cd ../demo
+mvn clean test
+```
+
+## Viewing the Test Report
+
+After running the tests, the Spring Test Insight report will be generated at:
+
+- `target/spring-test-profiler/latest.html`
+
+Open this file in a web browser to see:
+
+- Test execution summary
+- Spring context caching statistics
+- Cache hit/miss rates
+- Individual test results with execution times
+- Failed test details with stack traces
+
+## Test Structure
+
+The demo includes various types of tests:
+
+- `UserRepositoryTest` - @DataJpaTest for repository layer
+- `UserServiceTest` - Unit tests with mocks
+- `UserControllerTest` - @WebMvcTest for REST controllers
+- `UserIntegrationTest` - Full @SpringBootTest integration tests
+
+Each test class uses different Spring configurations, demonstrating how the extension tracks context caching across
+different test types.
+
+## Key Features Demonstrated
+
+1. **Context Caching Visualization**: See which test classes share Spring contexts
+2. **Performance Metrics**: Track context load times and test execution durations
+3. **Cache Efficiency**: Monitor cache hit rates to optimize test suite performance
+4. **Test Results**: Comprehensive view of passed, failed, and skipped tests
+
+## Tips for Optimization
+
+Based on the report, you can:
+
+- Identify tests that create new contexts unnecessarily
+- Group tests with similar configurations to improve cache reuse
+- Find slow context initialization that impacts test performance