// Add a string with zero slashes: resulting URL gains one slash.
    assertThat(base.newBuilder().addPathSegments("").build().encodedPath)
      .isEqualTo("/a/b/c/")
    assertThat(base.newBuilder().addPathSegments("d").build().encodedPath)
      .isEqualTo("/a/b/c/d")

    // Add a string with one slash: resulting URL gains two slashes.

023E          ; mapped                 ; 2C66          # 4.1  LATIN CAPITAL LETTER T WITH DIAGONAL STROKE
023F..0240    ; valid                                  # 4.1  LATIN SMALL LETTER S WITH SWASH TAIL..LATIN SMALL LETTER Z WITH SWASH TAIL
0241          ; mapped                 ; 0242          # 4.1  LATIN CAPITAL LETTER GLOTTAL STOP
0242          ; valid                                  # 5.0  LATIN SMALL LETTER GLOTTAL STOP

      apply {
        push(pathSegment, 0, pathSegment.length, addTrailingSlash = false, alreadyEncoded = false)
      }

    /**
     * Adds a set of path segments separated by a slash (either `\` or `/`). If `pathSegments`
     * starts with a slash, the resulting URL will have empty path segment.
     */
    fun addPathSegments(pathSegments: String): Builder = addPathSegments(pathSegments, false)