static Stream<Arguments> parametersForTestIsNullable() {
        return Stream.of(
            Arguments.of(null, true, true),
            Arguments.of(null, false, false),
            Arguments.of(Boolean.TRUE, true, true),
            Arguments.of(Boolean.TRUE, false, true),
            Arguments.of(Boolean.FALSE, true, false),
            Arguments.of(Boolean.FALSE, false, false)
        );
    }
Test for the {@link SchemaGeneratorConfigImpl} class.
jsonschema-generator/src/test/java/com/github/victools/jsonschema/generator/impl/SchemaGeneratorConfigImplTest.java