class TagsTest {
  @Test
  fun emptyTags() {
    val tags = EmptyTags
    assertThat(tags[String::class]).isNull()
  }

  @Test
  fun singleElement() {
    val tags = EmptyTags.plus(String::class, "hello")
    assertThat(tags[String::class]).isEqualTo("hello")
  }

  @Test
  fun multipleElements() {
    val tags =
      EmptyTags
        .plus(String::class, "hello")

import java.util.concurrent.atomic.AtomicReference
import kotlin.reflect.KClass

/**
 * An immutable collection of key-value pairs implemented as a singly-linked list.
 *
 * Build up a collection by starting with [EmptyTags] and repeatedly calling [plus]. Each such call
 * returns a new instance.
 *
 * This collection is optimized for safe concurrent access over a very small number of elements.
 *

import kotlin.test.Test
import kotlin.test.assertFailsWith
import okhttp3.Headers.Companion.headersOf
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.internal.EmptyTags

class RequestCommonTest {
  @Test
  fun constructorNormal() {
    val url = "https://example.com/".toHttpUrl()
    val body = "hello".toRequestBody()
    val headers = headersOf("User-Agent", "RequestTest")

import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.RequestBody.Companion.asRequestBody
import okhttp3.RequestBody.Companion.toRequestBody
import okhttp3.internal.EmptyTags
import okio.Buffer
import okio.ByteString.Companion.decodeHex
import okio.ByteString.Companion.encodeUtf8
import okio.GzipSource
import okio.buffer
import okio.use
import org.junit.jupiter.api.Test

 */
package okhttp3

import java.net.URL
import kotlin.reflect.KClass
import okhttp3.Headers.Companion.headersOf
import okhttp3.HttpUrl.Companion.toHttpUrl
import okhttp3.internal.EmptyTags
import okhttp3.internal.Tags
import okhttp3.internal.http.GzipRequestBody
import okhttp3.internal.http.HttpMethod
import okhttp3.internal.isProbablyUtf8
import okhttp3.internal.isSensitiveHeader
import okio.Buffer