public void test_addChain_single() {
        TestAuthenticationChain chain = new TestAuthenticationChain();
        authenticationManager.addChain(chain);

        // Verify chain was added by testing its effect
        User user = createTestUser("testuser");
        authenticationManager.insert(user);
        assertEquals(1, chain.updateCallCount);
    }

    // Test addChain multiple

import java.util.Arrays;

import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.Authentication;
import org.apache.maven.settings.Server;
import org.codehaus.plexus.testing.PlexusTest;
import org.junit.jupiter.api.Test;

import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;

/**
 * Tests {@link LegacyRepositorySystem}.

@NullUnmarked
public class ThrowablesTest extends TestCase {
  // We're testing that the method is in fact equivalent to throwing the exception directly.
  @SuppressWarnings("ThrowIfUncheckedKnownUnchecked")
  public void testThrowIfUnchecked_unchecked() {
    assertThrows(
        SomeUncheckedException.class, () -> throwIfUnchecked(new SomeUncheckedException()));
  }

  // We're testing that the method is in fact equivalent to throwing the exception directly.

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing.google;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.Multiset;
import com.google.common.collect.testing.TestCollectionGenerator;
import org.jspecify.annotations.NullMarked;
import org.jspecify.annotations.Nullable;

/**

import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.MultisetTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringMultisetGenerator;
import java.io.Serializable;
import java.util.Collections;
import java.util.HashMap;

 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.google.common.collect.testing;

import static com.google.common.collect.testing.Helpers.mapEntry;

import com.google.common.annotations.GwtCompatible;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import org.jspecify.annotations.NullMarked;

        "Expiration": "2019-02-20T19:56:59-08:00",
        "AccessKeyId": "K9DTIMUVZXEXJL3ATUOY"
    }
}
```

### Testing an example with `assume-role.go`

The included program in this directory can also be used for testing:

``` shell
$ go run assume-role.go -u foobar -p foo12345 -d
Only displaying credentials:
AccessKeyID: 27YDRYEM0S9B44AJJX9X

import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.ListMultimapTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringListMultimapGenerator;
import com.google.common.collect.testing.google.UnmodifiableCollectionTests;
import com.google.common.testing.EqualsTester;
import com.google.common.testing.NullPointerTester;

import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.SetMultimapTestSuiteBuilder;
import com.google.common.collect.testing.google.TestStringSetMultimapGenerator;
import com.google.common.collect.testing.google.UnmodifiableCollectionTests;
import com.google.common.testing.CollectorTester;
import com.google.common.testing.EqualsTester;

package cmd

import (
	"os"
	"path"
	"syscall"
	"testing"
)

// Based on `man getumask` a vaporware GNU extension to glibc.
// returns file mode creation mask.
func getUmask() int {
	mask := syscall.Umask(0)
	syscall.Umask(mask)
	return mask
}

// Tests if the directory and file creations happen with proper umask.
func TestIsValidUmaskVol(t *testing.T) {
	tmpPath := t.TempDir()
	testCases := []struct {