/// info

Keep in mind that dataclasses can't do everything Pydantic models can do.

So, you might still need to use Pydantic models.

But if you have a bunch of dataclasses laying around, this is a nice trick to use them to power a web API using FastAPI. 🤓

///

## Dataclasses in `response_model` { #dataclasses-in-response-model }

import java.util.concurrent.Future;
import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Basher test for {@link ConcurrentHashMultiset}: start a bunch of threads, have each of them do
 * operations at random. Each thread keeps track of the per-key deltas that it's directly
 * responsible for; after all threads have completed, we sum the per-key deltas and compare to the

    assertThat(notification.getValue()).isEqualTo("a");
    assertThat(cache.size()).isEqualTo(1);
    assertThat(cache.getUnchecked("b")).isEqualTo("b");
  }

  // "Basher tests", where we throw a bunch of stuff at a LoadingCache and check basic invariants.

  /**
   * This is a less carefully-controlled version of {@link #testRemovalNotification_clear} - this is

    timeToFirstByte()
  }

  /**
   * Test to confirm that events are reported at the time they occur and no earlier and no later.
   * This inserts a bunch of synthetic 250 ms delays into both client and server and confirms that
   * the same delays make it back into the events.
   *

			t.Fatalf("(%s) Object: %s Case %d ByteRange: %s --> data mismatch! (msg: %s)", instanceType, oi.objectName, i+1, byteRange, msg)
		}
	}

	// Iterate over each uploaded object and do a bunch of get
	// requests on them.
	caseNumber := 0
	signFns := []testSignedReqFn{newTestSignedRequestV2, newTestSignedRequestV4}
	for _, oi := range objectInputs {
		objLen := objectLength(oi)

    </magic>
  </mime-type>
  <mime-type type="application/x-x509-key;format=der">
    <sub-class-of type="application/x-x509-key"/>
    <!-- These are just a bunch of magic integers as defined by the key format... -->
    <!-- Always seem to have a version integer as their first entry, -->
    <!--  normally 00, 01 or 02, check for that -->
    <magic priority="40">