* https://tersesystems.com/blog/2018/09/08/keymanagers-and-keystores/
 *
 * Install OpenSC separately. On a mac `brew cast install opensc`.
 */
@SuppressSignatureCheck
class YubikeyClientAuth {
  fun run() {
    // The typical PKCS11 slot, may vary with different hardware.
    val slot = 0

    val config = "--name=OpenSC\nlibrary=/Library/OpenSC/lib/opensc-pkcs11.so\nslot=$slot\n"

		},
		{
			[]clause.Interface{clause.Update{Table: clause.Table{Name: "products"}, Modifier: "LOW_PRIORITY"}},
			"UPDATE LOW_PRIORITY `products`", nil,
		},
	}

	for idx, result := range results {
		t.Run(fmt.Sprintf("case #%v", idx), func(t *testing.T) {
			checkBuildClauses(t, result.Clauses, result.Result, result.Vars)
		})
	}

		b.Fatal(err)
	}

	creds := globalActiveCred
	b.Run("uncached", func(b *testing.B) {
		fn := authenticateNode
		b.ResetTimer()
		b.ReportAllocs()
		for i := 0; i < b.N; i++ {
			fn(creds.AccessKey, creds.SecretKey)
		}
	})
	b.Run("cached", func(b *testing.B) {
		fn := newCachedAuthToken()
		b.ResetTimer()
		b.ReportAllocs()

{* ../../docs_src/async_tests/main.py *}

The file `test_main.py` would have the tests for `main.py`, it could look like this now:

{* ../../docs_src/async_tests/test_main.py *}

## Run it

You can run your tests as usual via:

<div class="termy">

```console
$ pytest

---> 100%
```

</div>

## In Detail

        .build()
    client =
      OkHttpClient.Builder()
        .sslSocketFactory(certificates.sslSocketFactory(), certificates.trustManager)
        .build()
  }

  fun run() {
    showUrl("https://squareup.com/robots.txt")
    showUrl("https://publicobject.com/helloworld.txt")
  }

  private fun showUrl(url: String) {
    val request = Builder().url(url).build()

/** Replacements for JUnit's {@code assertThrows} that work under GWT/J2CL. */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class ReflectionFreeAssertThrows {
  interface ThrowingRunnable {
    void run() throws Throwable;
  }

  interface ThrowingSupplier {
    @Nullable Object get() throws Throwable;
  }

  @CanIgnoreReturnValue
  static <T extends Throwable> T assertThrows(

/** Replacements for JUnit's {@code assertThrows} that work under GWT/J2CL. */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class ReflectionFreeAssertThrows {
  interface ThrowingRunnable {
    void run() throws Throwable;
  }

  interface ThrowingSupplier {
    @Nullable Object get() throws Throwable;
  }

  @CanIgnoreReturnValue
  static <T extends Throwable> T assertThrows(

/** Replacements for JUnit's {@code assertThrows} that work under GWT/J2CL. */
@GwtCompatible(emulated = true)
@ElementTypesAreNonnullByDefault
final class ReflectionFreeAssertThrows {
  interface ThrowingRunnable {
    void run() throws Throwable;
  }

  interface ThrowingSupplier {
    @Nullable Object get() throws Throwable;
  }

  @CanIgnoreReturnValue
  static <T extends Throwable> T assertThrows(

    final CyclicBarrier barrier = new CyclicBarrier(2);
    final CountDownLatch latch = new CountDownLatch(2);

    new Thread(
            new Runnable() {
              @Override
              public void run() {
                try {
                  barrier.await();
                } catch (Exception e) {
                  throw new AssertionError(e);
                }

   * to calling it exactly once.
   *
   * @since 10.0 (present in 1.0 as {@code run})
   */
  public void execute() {
    // Lock while we update our state so the add method above will finish adding any listeners
    // before we start to run them.
    RunnableExecutorPair list;
    synchronized (this) {
      if (executed) {
        return;
      }