Method Equals

cpp/src/arrow/dataset/file_test.cc:123–123

 protected:
  std::string type_name() const override { return "mock"; }
  bool Equals(const FileFormat& other) const override { return false; }
  Result<bool> IsSupported(const FileSource& source) const override { return true; }
  Result<std::shared_ptr<Schema>> Inspect(const FileSource& source) const override {
    return Status::NotImplemented("Not needed for test");