assertFailsWith<IllegalArgumentException> {
      mapOf("" to "OkHttp").toHeaders()
    }
  }

  @Test fun ofMapThrowsOnBlankName() {
    assertFailsWith<IllegalArgumentException> {
      mapOf(" " to "OkHttp").toHeaders()
    }
  }

  @Test fun ofMapAcceptsEmptyValue() {
    val headers = mapOf("User-Agent" to "").toHeaders()
    assertThat(headers.value(0)).isEqualTo("")
  }

  @Test fun ofMapTrimsKey() {

import assertk.assertThat
import assertk.assertions.containsExactly
import assertk.assertions.isEqualTo
import java.time.Instant
import java.util.Date
import kotlin.test.assertFailsWith
import okhttp3.Headers.Companion.toHeaders
import org.junit.jupiter.api.Test

class HeadersJvmTest {
  @Test fun byteCount() {
    assertThat(Headers.EMPTY.byteCount()).isEqualTo(0L)
    assertThat(
      Headers
        .Builder()

		return ""
	}
	off, length, err := h.GetOffsetLength(resourceSize)
	if err != nil {
		return ""
	}
	return fmt.Sprintf("%d-%d", off, off+length-1)
}

// ToHeader returns the Range header value.
func (h *HTTPRangeSpec) ToHeader() (string, error) {
	if h == nil {
		return "", nil
	}
	start := strconv.Itoa(int(h.Start))
	end := strconv.Itoa(int(h.End))
	switch {
	case h.Start >= 0 && h.End >= 0:

		if err != nil {
			if !testCase.errExpected || err == nil && testCase.errExpected {
				t.Errorf("unexpected err: %v", err)
			}
			continue
		}
		h, err := rs.ToHeader()
		if err != nil && !testCase.errExpected || err == nil && testCase.errExpected {
			t.Errorf("expected error with invalid range: %v", err)
		}
		if h != testCase.spec {