void testJoinWithStringBuffer() {
        StringBuffer sb1 = new StringBuffer("alpha");
        StringBuffer sb2 = new StringBuffer("beta");
        String result = StringUtil.join("-", sb1, sb2);
        assertEquals("alpha-beta", result);
    }

    @Test
    @DisplayName("Should handle mixed CharSequence types")
    void testJoinWithMixedCharSequenceTypes() {
        String str = "string";

  - type: textarea
    attributes:
      label: 1. What are you trying to do?
    validations:
      required: true

  - type: textarea
    attributes:
      label: 2. What's the best code you can write to accomplish that without the new feature?
    validations:
      required: true

  - type: textarea
    attributes:
      label: 3. What would that same code look like if we added your feature?

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.graph.Graphs.checkNonNegative;

import com.google.common.annotations.Beta;
import com.google.common.base.Optional;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
import com.google.errorprone.annotations.DoNotMock;

/**

   *
   * {@snippet :
   * public static final ImmutableSortedMultiset<Bean> BEANS =
   *     new ImmutableSortedMultiset.Builder<Bean>(colorComparator())
   *         .addCopies(Bean.COCOA, 4)
   *         .addCopies(Bean.GARDEN, 6)
   *         .addCopies(Bean.RED, 8)
   *         .addCopies(Bean.BLACK_EYED, 10)
   *         .build();
   * }
   *

  - [Changelog since v1.30.0-beta.0](#changelog-since-v1300-beta0)
  - [Changes by Kind](#changes-by-kind-17)
    - [Failing Test](#failing-test-1)
    - [Bug or Regression](#bug-or-regression-15)
  - [Dependencies](#dependencies-17)
    - [Added](#added-17)
    - [Changed](#changed-17)
    - [Removed](#removed-17)
- [v1.30.0-beta.0](#v1300-beta0)
  - [Downloads for v1.30.0-beta.0](#downloads-for-v1300-beta0)

    static {
        initialize();
    }

    /**
     * Returns a {@link BeanDesc}.
     *
     * @param clazz
     *            the Bean class. Must not be {@literal null}
     * @return {@link BeanDesc}
     */
    public static BeanDesc getBeanDesc(final Class<?> clazz) {
        assertArgumentNotNull("clazz", clazz);

        if (!initialized) {

 */

package com.google.common.graph;

import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.graph.Graphs.checkNonNegative;

import com.google.common.annotations.Beta;
import com.google.common.base.Optional;
import com.google.errorprone.annotations.CanIgnoreReturnValue;

/**
 * A builder for constructing instances of {@link MutableNetwork} or {@link ImmutableNetwork} with

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.graph.Graphs.checkNonNegative;

import com.google.common.annotations.Beta;
import com.google.common.base.Optional;
import com.google.errorprone.annotations.CanIgnoreReturnValue;

/**
 * A builder for constructing instances of {@link MutableValueGraph} or {@link ImmutableValueGraph}

 */

package com.google.common.graph;

import static com.google.common.base.Preconditions.checkNotNull;
import static java.util.Objects.requireNonNull;

import com.google.common.annotations.Beta;
import com.google.common.base.Function;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.errorprone.annotations.CanIgnoreReturnValue;

     *
     * @param query the search query string
     * @param params the search request parameters including pagination, filters, etc.
     * @param userBean the optional user bean for access control and personalization
     * @return the search result containing matched documents and metadata
     */