code: /*
   * SPDX-License-Identifier: Apache-2.0
   * Copyright 2018-2019 The Feast Authors
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package dev.feast;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  import static org.junit.jupiter.api.Assertions.assertThrows;
  
  import com.google.common.collect.ImmutableList;
  import com.google.protobuf.TextFormat;
  import feast.proto.serving.ServingAPIProto.FeatureReferenceV2;
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.List;
  import java.util.stream.Collectors;
  import java.util.stream.Stream;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.Arguments;
  import org.junit.jupiter.params.provider.MethodSource;
  import org.junit.jupiter.params.provider.NullSource;
  
  class RequestUtilTest {
  
    private static Stream<Arguments> provideValidFeatureRefs() {
      return Stream.of(
          Arguments.of(
              Arrays.asList("driver:driver_id"),
              Arrays.asList(
                  FeatureReferenceV2.newBuilder()
                      .setFeatureViewName("driver")
                      .setFeatureName("driver_id")
                      .build())));
    }
  
    @ParameterizedTest
    @MethodSource("provideValidFeatureRefs")
    void createFeatureRefs_ShouldReturnFeaturesForValidFeatureRefs(
        List<String> input, List<FeatureReferenceV2> expected) {
      List<FeatureReferenceV2> actual = RequestUtil.createFeatureRefs(input);
      // Order of the actual and expected FeatureTables do no not matter
      actual.sort(Comparator.comparing(FeatureReferenceV2::getFeatureName));
      expected.sort(Comparator.comparing(FeatureReferenceV2::getFeatureName));
      assertEquals(expected.size(), actual.size());
      for (int i = 0; i < expected.size(); i++) {
        String expectedString = TextFormat.printer().printToString(expected.get(i));
        String actualString = TextFormat.printer().printToString(actual.get(i));
        assertEquals(expectedString, actualString);
      }
    }
  
    @ParameterizedTest
    @MethodSource("provideValidFeatureRefs")
    void renderFeatureRef_ShouldReturnFeatureRefString(
        List<String> expected, List<FeatureReferenceV2> input) {
      input = input.stream().map(ref -> ref.toBuilder().build()).collect(Collectors.toList());
      List<String> actual =
          input.stream()
              .map(ref -> String.format("%s:%s", ref.getFeatureViewName(), ref.getFeatureName()))
              .collect(Collectors.toList());
      assertEquals(expected.size(), actual.size());
      for (int i = 0; i < expected.size(); i++) {
        assertEquals(expected.get(i), actual.get(i));
      }
    }
  
    private static Stream<Arguments> provideInvalidFeatureRefs() {
      return Stream.of(Arguments.of(ImmutableList.of("project/feature")));
    }
  
    private static Stream<Arguments> provideMissingFeatureTableFeatureRefs() {
      return Stream.of(Arguments.of(ImmutableList.of("feature")));
    }
  
    @ParameterizedTest
    @MethodSource("provideInvalidFeatureRefs")
    void createFeatureRefs_ShouldThrowExceptionForProjectInFeatureRefs(List<String> input) {
      assertThrows(IllegalArgumentException.class, () -> RequestUtil.createFeatureRefs(input));
    }
  
    @ParameterizedTest
    @MethodSource("provideMissingFeatureTableFeatureRefs")
    void createFeatureRefs_ShouldThrowExceptionForMissingFeatureTableInFeatureRefs(
        List<String> input) {
      assertThrows(IllegalArgumentException.class, () -> RequestUtil.createFeatureRefs(input));
    }
  
    @ParameterizedTest
    @NullSource
    void createFeatureRefs_ShouldThrowExceptionForNullFeatureRefs(List<String> input) {
      assertThrows(IllegalArgumentException.class, () -> RequestUtil.createFeatureRefs(input));
    }
  }
  