javatests/com/google/setfilters/cuckoofilter/SemiSortedCuckooFilterTableTest.java

// Copyright 2022 Google LLC
//
// 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 com.google.setfilters.cuckoofilter;

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import java.util.Random;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.JUnit4;

@RunWith(JUnit4.class)
public final class SemiSortedCuckooFilterTableTest {

  @Test
  public void creation_failsWithInvalidBucketCapacity() {
    String message =
        assertThrows(
                IllegalArgumentException.class,
                () ->
                    new SemiSortedCuckooFilterTable(
                        CuckooFilterConfig.Size.newBuilder()
                            .setBucketCount(100)
                            .setBucketCapacity(5)
                            .setFingerprintLength(4)
                            .build(),
                        new Random()))
            .getMessage();

    assertThat(message)
        .isEqualTo("SemiSortedCuckooFilterTable only supports bucket capacity of 4.");
  }

  @Test
  public void creation_failsWithInvalidFingerprintLength() {
    String message =
        assertThrows(
                IllegalArgumentException.class,
                () ->
                    new SemiSortedCuckooFilterTable(
                        CuckooFilterConfig.Size.newBuilder()
                            .setBucketCount(100)
                            .setBucketCapacity(4)
                            .setFingerprintLength(3)
                            .build(),
                        new Random()))
            .getMessage();

    assertThat(message)
        .isEqualTo("SemiSortedCuckooFilterTable only supports fingerprint length >= 4.");
  }
}