Add assertions for JsonSubTypes.Types

Author: jpfinne

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

@@ -4346,7 +4346,9 @@ void replaceOneOfByDiscriminatorMapping(String file) {
                 .fileContains("String type")
                 .fileDoesNotContain("coordinates")
                 .assertTypeAnnotations()
-                .containsWithName("JsonSubTypes");
+                .containsWithName("JsonSubTypes")
+                .recursivelyContainsWithNameAndAttributes("JsonSubTypes.Type", Map.of("value", "MultiPolygon.class", "name", "\"MultiPolygon\""))
+                .recursivelyContainsWithNameAndAttributes("JsonSubTypes.Type", Map.of("value", "Polygon.class", "name", "\"Polygon\""));
 
         JavaFileAssert.assertThat(files.get("Polygon.java"))
                 .extendsClass("GeoJsonObject")