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package com.google.api.gax.batching;

import static com.google.api.gax.batching.AssertByPolling.assertByPolling;

import com.google.common.truth.Truth;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

class AssertByPollingTest {

  @Test
  void testFailsWhenTimeoutExceeded() {
    AssertionError error =
        Assertions.assertThrows(
            AssertionError.class,
            () ->
                assertByPolling(
                    java.time.Duration.ofNanos(2), () -> Truth.assertThat(1).isAtLeast(2)));

    Throwable cause = error.getCause();
    Truth.assertThat(cause).isInstanceOf(AssertionError.class);
    // Error provides original assertion failure that never came true.
    Truth.assertThat(cause.getMessage()).contains("expected to be at least");
  }

  @Test
  void testImmediateSuccessSucceedsRegardlessOfTimeout() throws InterruptedException {
    Runnable succeedsAfter1ms =
        () -> {
          try {
            TimeUnit.MILLISECONDS.sleep(1);
          } catch (InterruptedException ex) {
            throw new RuntimeException(ex);
          }
        };
    java.time.Duration timeout = java.time.Duration.ofNanos(0);
    assertByPolling(timeout, succeedsAfter1ms);
  }

  @Test
  void testSucceedsAfterInitialFailure() throws InterruptedException {
    AtomicInteger attempt = new AtomicInteger(1);
    AtomicInteger numFailures = new AtomicInteger(0);
    Runnable succeedsSecondTime =
        () -> {
          if (attempt.getAndIncrement() < 2) {
            numFailures.incrementAndGet();
            Assertions.fail();
          }
        };

    java.time.Duration timeout = java.time.Duration.ofMillis(300);
    assertByPolling(timeout, succeedsSecondTime);
    Truth.assertThat(numFailures.get()).isEqualTo(1);
  }
}
