return "set" + capitalizeName(propertyName);
        }

        public boolean isValidPropertyName(String propertyName) {
            return propertyName != null && propertyName.length() > 0;
        }

        private String capitalizeName(String name) {
            if (name == null || name.isEmpty()) {
                return name;
            }

    description: str | None = None
    variables: dict[str, ServerVariable] | None = None


class Reference(BaseModel):
    ref: str = Field(alias="$ref")


class Discriminator(BaseModel):
    propertyName: str
    mapping: dict[str, str] | None = None


class XML(BaseModelWithConfig):
    name: str | None = None
    namespace: str | None = None
    prefix: str | None = None

  @GwtIncompatible // Maps.fromProperties
  public void testFromPropertiesNullKey() {
    Properties properties =
        new Properties() {
          @Override
          public Enumeration<?> propertyNames() {
            return Iterators.asEnumeration(asList(null, "first", "second").iterator());
          }
        };
    properties.setProperty("first", "true");
    properties.setProperty("second", "null");

    ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();

    for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements(); ) {
      /*
       * requireNonNull is safe because propertyNames contains only non-null elements.
       *
       * Accordingly, we have it annotated as returning `Enumeration<? extends Object>` in our

    ImmutableMap.Builder<String, String> builder = ImmutableMap.builder();

    for (Enumeration<?> e = properties.propertyNames(); e.hasMoreElements(); ) {
      /*
       * requireNonNull is safe because propertyNames contains only non-null elements.
       *
       * Accordingly, we have it annotated as returning `Enumeration<? extends Object>` in our