@Test
    public void testGetCustomDefinition_noMapping() {
        Assertions.assertNull(this.instance.getCustomDefinition(Mockito.mock(ResolvedType.class), this.getContext(), null));
    }
Test for the {@link SchemaGeneratorConfigImpl} class.
jsonschema-generator/src/test/java/com/github/victools/jsonschema/generator/impl/SchemaGeneratorConfigImplTest.java