openapi-processor/openapi-processor-spring#198, let a processor create additional packages

Author: hauner

openapi-processor-core/src/test/kotlin/io/openapiprocessor/core/writer/DefaultWriterFactorySpec.kt

@@ -160,6 +160,7 @@ class DefaultWriterFactorySpec : StringSpec({
             override fun initAdditionalPackages(options: ApiOptions): Map<String, Path> {
                 val pkgPaths = HashMap<String, Path>()
                 val (name, path) = initTargetPackage("foo/bar")
+                pkgPaths[name] = path
                 return pkgPaths
             }
         }