fix: add missing swagger2 tags import in rest-assured api.mustache (#23285) (#23946)

Author: Natarajan717

modules/openapi-generator/src/main/resources/Java/libraries/rest-assured/api.mustache

@@ -30,6 +30,7 @@ import io.swagger.v3.oas.annotations.enums.*;
 import io.swagger.v3.oas.annotations.media.*;
 import io.swagger.v3.oas.annotations.responses.*;
 import io.swagger.v3.oas.annotations.security.*;
+import io.swagger.v3.oas.annotations.tags.*;
 {{/swagger2AnnotationLibrary}}
 
 {{#useBeanValidation}}

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/JavaClientCodegenTest.java

@@ -4536,5 +4536,26 @@ public void testUseDeductionForOneInterfaces() {
 
     }
 
+    @Test
+    public void testSwagger2TagImportRestAssured() throws IOException {
+        final Map<String, File> files = generateFromContract(
+                "src/test/resources/3_0/petstore.yaml",
+                JavaClientCodegen.REST_ASSURED,
+                Map.of(ANNOTATION_LIBRARY, "swagger2")
+        );
+
+        // find the generated API file
+        File apiFile = files.values().stream()
+                .filter(f -> f.getName().endsWith("Api.java"))
+                .findFirst()
+                .orElseThrow(() -> new AssertionError("No API file generated"));
+
+        String content = Files.readString(apiFile.toPath());
+
+        // verify tags import is present when swagger2 is used with rest-assured
+        assertThat(content)
+                .contains("import io.swagger.v3.oas.annotations.tags.*;")
+                .contains("@Tag(");
+    }
 
 }

modules/openapi-generator/src/test/resources/3_0/java/petstore.yaml

@@ -0,0 +1,17 @@
+openapi: 3.0.3
+info:
+  title: Test API
+  version: 1.0.0
+tags:
+  - name: pets
+    description: Pet operations
+paths:
+  /pets:
+    get:
+      tags:
+        - pets
+      operationId: listPets
+      summary: List all pets
+      responses:
+        '200':
+          description: OK