update doc, tests

Author: wing328

docs/customization.md

@@ -644,6 +644,13 @@ Example:
 java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g java -i modules/openapi-generator/src/test/resources/3_0/required-properties.yaml -o /tmp/java-okhttp/ --openapi-normalizer NORMALIZER_CLASS=org.openapitools.codegen.OpenAPINormalizerTest$RemoveRequiredNormalizer
 ```
 
+- `LOOSE_NULL_DEFINITIONS`: When set to true, allow more schema definitions to be the same as `null` in OpenAPI 3.1 spec by setting ModelUtils.looseNullDefinitions to true.
+
+Example:
+```
+java -jar modules/openapi-generator-cli/target/openapi-generator-cli.jar generate -g java -i modules/openapi-generator/src/test/resources/bugs/issue_anyof_bare_nullable_object.yaml -o /tmp/java-okhttp/ --openapi-normalizer LOOSE_NULL_DEFINITIONS=true
+```
+
 - `REMOVE_PROPERTIES_FROM_TYPE_OTHER_THAN_OBJECT`: When set to true, remove the "properties" of a schema with type other than "object".
 
 Example:

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

@@ -1834,7 +1834,7 @@ public Schema normalizeSchema(Schema schema, Set<Schema> visitedSchemas) {
     }
 
     @Test
-    public void testREPLACE_ONE_OF_BY_DISCRIMINATOR_MAPPING() {
+    public void testReplaceOneOfByDiscriminatorMapping() {
         OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_0/oneOf_issue_23527.yaml");
 
         Map<String, String> inputRules = Map.of("REPLACE_ONE_OF_BY_DISCRIMINATOR_MAPPING", "true");
@@ -1847,7 +1847,7 @@ public void testREPLACE_ONE_OF_BY_DISCRIMINATOR_MAPPING() {
     }
 
     @Test
-    public void issue_14769() {
+    public void testIssue14769() {
         OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_0/oneOf_issue_14769.yaml");
         Map<String, String> inputRules = Map.of("REPLACE_ONE_OF_BY_DISCRIMINATOR_MAPPING", "true");
         OpenAPINormalizer openAPINormalizer = new OpenAPINormalizer(openAPI, inputRules);
@@ -1864,7 +1864,7 @@ public void issue_14769() {
     }
 
     @Test
-    public void oneOf_issue_23276() {
+    public void oneOfIssue23276() {
         OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/3_0/oneOf_issue_23276.yaml");
         Map<String, String> inputRules = Map.of("REPLACE_ONE_OF_BY_DISCRIMINATOR_MAPPING", "true");
         OpenAPINormalizer openAPINormalizer = new OpenAPINormalizer(openAPI, inputRules);