refactor: simplify full-stack tests with AbstractFullStackTest base class

Create AbstractFullStackTest base class that encapsulates all common
configuration (plugins, classpath, annotations) to drastically simplify
test code. Tests now only need to extend the base class and call
assertTypescriptMatchesSnapshot().

Changes:
- Add AbstractFullStackTest with all plugins and extended classpath
- Refactor and rename 4 existing tests to use the base class
  - UUIDFullStackTest → UUIDTest (~50% less code)
  - JsonNodeFullStackTest → JsonNodeTest (~50% less code)
  - MultipartFileFullStackTest → MultipartFileTest (~50% less code)
  - PushTypeFullStackTest → PushTypeTest (~50% less code)

The base class includes:
- All plugins (Backbone, TransferTypes, Model, Nonnull, SubTypes, MultipartFileChecker)
- Extended classpath with Flux and EndpointSubscription
- Both @endpoint and @EndpointExposed annotations
- Simple one-line test assertions

Net result: -302 lines of boilerplate code

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: Artur-

packages/java/typescript-generator/src/test/java/com/vaadin/hilla/parser/plugins/transfertypes/file/MultipartFileFullStackTest.java

@@ -15,32 +15,19 @@
  */
 package com.vaadin.hilla.parser.plugins.transfertypes.file;
 
-import java.io.IOException;
-import java.net.URISyntaxException;
-import java.util.List;
-import java.util.Set;
-
 import org.junit.jupiter.api.Test;
 
-import com.vaadin.hilla.parser.core.Parser;
-import com.vaadin.hilla.parser.plugins.backbone.BackbonePlugin;
-import com.vaadin.hilla.parser.plugins.transfertypes.TransferTypesPlugin;
-import com.vaadin.hilla.parser.plugins.transfertypes.test.helpers.TestHelper;
-import com.vaadin.hilla.parser.testutils.annotations.Endpoint;
+import com.vaadin.hilla.parser.testutils.AbstractFullStackTest;
 
-public class MultipartFileTest {
-    private final TestHelper helper = new TestHelper(getClass());
+/**
+ * Full-stack test for MultipartFile type handling - verifies complete Java →
+ * TypeScript generation pipeline.
+ */
+public class MultipartFileTest extends AbstractFullStackTest {
 
     @Test
     public void should_ReplaceMultipartFileClassWithLocalFileClass()
-            throws IOException, URISyntaxException {
-        var openAPI = new Parser()
-                .classPath(Set.of(helper.getTargetDir().toString()))
-                .endpointAnnotations(List.of(Endpoint.class))
-                .addPlugin(new BackbonePlugin())
-                .addPlugin(new TransferTypesPlugin())
-                .execute(List.of(MultipartFileEndpoint.class));
-
-        helper.executeParserWithConfig(openAPI);
+            throws Exception {
+        assertTypescriptMatchesSnapshot(MultipartFileEndpoint.class);
     }
 }

packages/java/typescript-generator/src/test/java/com/vaadin/hilla/parser/plugins/transfertypes/file/MultipartFileTest.java

@@ -15,32 +15,18 @@
  */
 package com.vaadin.hilla.parser.plugins.transfertypes.jsonnode;
 
-import java.io.IOException;
-import java.net.URISyntaxException;
-import java.util.List;
-import java.util.Set;
-
 import org.junit.jupiter.api.Test;
 
-import com.vaadin.hilla.parser.core.Parser;
-import com.vaadin.hilla.parser.plugins.backbone.BackbonePlugin;
-import com.vaadin.hilla.parser.plugins.transfertypes.TransferTypesPlugin;
-import com.vaadin.hilla.parser.plugins.transfertypes.test.helpers.TestHelper;
-import com.vaadin.hilla.parser.testutils.annotations.Endpoint;
+import com.vaadin.hilla.parser.testutils.AbstractFullStackTest;
 
-public class JsonNodeTest {
-    private final TestHelper helper = new TestHelper(getClass());
+/**
+ * Full-stack test for JsonNode type handling - verifies complete Java →
+ * TypeScript generation pipeline.
+ */
+public class JsonNodeTest extends AbstractFullStackTest {
 
     @Test
-    public void should_ReplaceJsonNodeClassWithObject()
-            throws IOException, URISyntaxException {
-        var openAPI = new Parser()
-                .classPath(Set.of(helper.getTargetDir().toString()))
-                .endpointAnnotations(List.of(Endpoint.class))
-                .addPlugin(new BackbonePlugin())
-                .addPlugin(new TransferTypesPlugin())
-                .execute(List.of(JsonNodeEndpoint.class));
-
-        helper.executeParserWithConfig(openAPI);
+    public void should_ReplaceJsonNodeClassWithObject() throws Exception {
+        assertTypescriptMatchesSnapshot(JsonNodeEndpoint.class);
     }
 }

packages/java/typescript-generator/src/test/java/com/vaadin/hilla/parser/plugins/transfertypes/jsonnode/JsonNodeFullStackTest.java

@@ -15,39 +15,19 @@
  */
 package com.vaadin.hilla.parser.plugins.transfertypes.push;
 
-import java.io.File;
-import java.io.IOException;
-import java.net.URISyntaxException;
-import java.util.List;
-
 import org.junit.jupiter.api.Test;
-import reactor.core.publisher.Flux;
 
-import com.vaadin.hilla.EndpointSubscription;
-import com.vaadin.hilla.parser.core.Parser;
-import com.vaadin.hilla.parser.plugins.backbone.BackbonePlugin;
-import com.vaadin.hilla.parser.plugins.transfertypes.TransferTypesPlugin;
-import com.vaadin.hilla.parser.plugins.transfertypes.test.helpers.TestHelper;
-import com.vaadin.hilla.parser.testutils.annotations.Endpoint;
-import com.vaadin.hilla.parser.testutils.annotations.EndpointExposed;
+import com.vaadin.hilla.parser.testutils.AbstractFullStackTest;
 
-public class PushTypeTest {
-    private final TestHelper helper = new TestHelper(getClass());
+/**
+ * Full-stack test for Push/Flux type handling - verifies complete Java →
+ * TypeScript generation pipeline.
+ */
+public class PushTypeTest extends AbstractFullStackTest {
 
     @Test
-    public void should_ReplacePushTypes()
-            throws IOException, URISyntaxException {
-        var classpath = helper.getExtendedClassPath(Flux.class,
-                EndpointSubscription.class);
-
-        var openAPI = new Parser()
-                .classPath(classpath.split(File.pathSeparator))
-                .endpointAnnotations(List.of(Endpoint.class))
-                .endpointExposedAnnotations(List.of(EndpointExposed.class))
-                .addPlugin(new BackbonePlugin())
-                .addPlugin(new TransferTypesPlugin())
-                .execute(List.of(OtherEndpoint.class, PushTypeEndpoint.class));
-
-        helper.executeParserWithConfig(openAPI);
+    public void should_ReplacePushTypes() throws Exception {
+        assertTypescriptMatchesSnapshot(OtherEndpoint.class,
+                PushTypeEndpoint.class);
     }
 }