The benefit of a dedicated project for these tests are:
- `qa` projects are dedicated two specific usecases and easier to maintain
- It keeps the specific test logic separated from the common test logic.
- You can run those tests in parallel to other projects of the build.

#### Using test fixtures

Sometimes we want to share test fixtures to setup the code under test across multiple projects. There are basically two ways doing so.

def clusterCredentials = [
        username: providers.systemProperty('tests.rest.cluster.username')
                .forUseAtConfigurationTime()
                .getOrElse('test_admin'),
        password: providers.systemProperty('tests.rest.cluster.password')
                .forUseAtConfigurationTime()
                .getOrElse('x-pack-test-password')
]

tasks.withType(StandaloneRestIntegTestTask).configureEach {

	baseTestCases := []TestSuiteCommon{
		// Init and run test on ErasureSD backend with signature v4.
		{serverType: "ErasureSD", signer: signerV4},
		// Init and run test on ErasureSD backend, with tls enabled.
		{serverType: "ErasureSD", signer: signerV4, secure: true},
		// Init and run test on Erasure backend.
		{serverType: "Erasure", signer: signerV4},
		// Init and run test on ErasureSet backend.

import org.junit.jupiter.api.Test;

/**
 * Tests for the DfsReferral class.
 * This class tests the functionality of the DfsReferral class,
 * ensuring that objects are constructed correctly, appended properly,
 * and that the toString method returns the expected format.
 */
class DfsReferralTest {

    /**
     * Tests the default constructor of the DfsReferral class.

import com.google.common.escape.UnicodeEscaper;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@link PercentEscaper}.
 *
 * @author David Beaumont
 */
@GwtCompatible
@NullUnmarked
public class PercentEscaperTest extends TestCase {

  /** Tests that the simple escaper treats 0-9, a-z and A-Z as safe */
  public void testSimpleEscaper() {

    }

    @ParameterizedTest
    @DisplayName("Test decode with various ACE counts")
    @ValueSource(ints = { 0, 1, 10, 100, 1000, 4096 })
    void testDecodeWithVariousAceCounts(int aceCount) throws SMBProtocolDecodingException {
        // This test is theoretical as we can't create huge buffers
        // but tests the boundary conditions
        if (aceCount <= 10) { // Only test small counts practically

          .that(returnType.getComponentType())
          .isEqualTo(annotationClass.getDeclaringClass());
    }
  }

  // This is public so that tests for Feature enums we haven't yet imagined
  // can reuse it.
  public static <E extends Enum<?> & Feature<?>> void assertGoodFeatureEnum(
      Class<E> featureEnumClass) {

import org.elasticsearch.gradle.internal.test.rest.transform.match.AddMatch;
import org.elasticsearch.gradle.internal.test.rest.transform.match.RemoveMatch;
import org.elasticsearch.gradle.internal.test.rest.transform.match.ReplaceKeyInMatch;
import org.elasticsearch.gradle.internal.test.rest.transform.match.ReplaceValueInMatch;
import org.elasticsearch.gradle.internal.test.rest.transform.skip.Skip;

    // we pad because the dummy hash function we use to test this, merely copies the input into
    // the output, so the input must be at least 32 bits, since the output has to be that long
    assertPutString(new char[] {'p', HashTestUtils.randomLowSurrogate(new Random())});
  }

  public void testPutStringWithHighSurrogate() {
    // we pad because the dummy hash function we use to test this, merely copies the input into

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for the MessageDigestHashFunction.
 *
 * @author Kurt Alfred Kluever
 */
@NullUnmarked
public class MessageDigestHashFunctionTest extends TestCase {