Add build method to FuncSetTaskBuilder and integration test (#1170)

- Add build() method override to FuncSetTaskBuilder to properly return SetTask
- Add test dependencies (serverlessworkflow-impl-model and serverlessworkflow-impl-jackson) to pom.xml
- Add integration test 'set_with_map' to verify set task functionality with WorkflowApplication
- Remove unused import (auth) from FuncDSLTest

This change enables proper building of set tasks in the functional fluent API and validates
the functionality through an end-to-end test that creates a workflow, executes it, and
verifies the output.

Fixes #1155

Signed-off-by: Matheus Cruz <matheuscruz.dev@gmail.com>

Author: mcruzdev

experimental/fluent/func/pom.xml

@@ -45,5 +45,17 @@
             <version>${version.org.mockito}</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>io.serverlessworkflow</groupId>
+            <artifactId>serverlessworkflow-impl-model</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.serverlessworkflow</groupId>
+            <artifactId>serverlessworkflow-impl-jackson</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

experimental/fluent/func/src/main/java/io/serverlessworkflow/fluent/func/FuncSetTaskBuilder.java

@@ -39,4 +39,9 @@ public FuncSetTaskBuilder expr(Map<String, Object> map) {
     this.task.getSet().withSetTaskConfiguration(new MapSetTaskConfiguration(map));
     return this;
   }
+
+  @Override
+  public SetTask build() {
+    return this.task;
+  }
 }

experimental/fluent/func/src/test/java/io/serverlessworkflow/fluent/func/FuncDSLTest.java

@@ -23,7 +23,6 @@
 import static io.serverlessworkflow.fluent.func.dsl.FuncDSL.http;
 import static io.serverlessworkflow.fluent.func.dsl.FuncDSL.listen;
 import static io.serverlessworkflow.fluent.func.dsl.FuncDSL.toOne;
-import static io.serverlessworkflow.fluent.spec.dsl.DSL.auth;
 import static io.serverlessworkflow.fluent.spec.dsl.DSL.use;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
@@ -42,6 +41,8 @@
 import io.serverlessworkflow.fluent.func.dsl.FuncDSL;
 import io.serverlessworkflow.fluent.func.dsl.FuncEmitSpec;
 import io.serverlessworkflow.fluent.func.dsl.FuncListenSpec;
+import io.serverlessworkflow.impl.WorkflowApplication;
+import io.serverlessworkflow.impl.WorkflowDefinition;
 import java.net.URI;
 import java.nio.charset.StandardCharsets;
 import java.util.List;
@@ -432,4 +433,21 @@ void call_with_preconfigured_http_spec() {
             .getUse());
     assertEquals(Map.of("foo", "bar"), http.getWith().getBody());
   }
+
+  @Test
+  void set_with_map() {
+    try (WorkflowApplication app = WorkflowApplication.builder().build()) {
+      Workflow workflow =
+          FuncWorkflowBuilder.workflow()
+              .tasks(f -> f.set(s -> s.expr(Map.of("message", "hello world!"))))
+              .build();
+
+      WorkflowDefinition workflowDefinition = app.workflowDefinition(workflow);
+
+      Map<String, Object> output =
+          workflowDefinition.instance(Map.of()).start().join().asMap().orElseThrow();
+
+      assertEquals(Map.of("message", "hello world!"), output);
+    }
+  }
 }