Add a fake endpoint to test enum request parameters

Author: rickyma

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

@@ -1968,6 +1968,10 @@ public void shouldPurAdditionalModelTypesOverAllModels() throws IOException {
         assertThat(generatedModels).isNotEmpty();
 
         for (File modelPath : generatedModels) {
+            String content = Files.readString(modelPath.toPath());
+            if (content.contains("public enum ")) {
+                continue;
+            }
             JavaFileAssert.assertThat(modelPath)
                     .assertTypeAnnotations()
                     .containsWithName("custom.Annotation")