lc.Add("key1", nil)

	value, exists := lc.Get("key1")
	if value != nil || !exists {
		t.Fatalf("unexpected value or existence flag for key1: value=%v, exists=%v", value, exists)
	}

	// Adding an entry with the same key but different value
	newVal := "val1"
	lc.Add("key1", &newVal)

	value, exists = lc.Get("key1")
	if value != &newVal || !exists {

func (config *TierConfigMgr) Edit(ctx context.Context, tierName string, creds madmin.TierCreds) error {
	config.Lock()
	defer config.Unlock()

	// check if tier by this name exists
	tierType, exists := config.isTierNameInUse(tierName)
	if !exists {
		return errTierNotFound
	}

	cfg := config.Tiers[tierName]
	switch tierType {
	case madmin.S3:
		if creds.AWSRole {
			cfg.S3.AWSRole = true
		}

    public void assertFileExistence(File dir, String filename, boolean shouldExist) {
        File file = new File(dir, filename);

        if (shouldExist) {
            assertTrue(file.exists());
        } else {
            assertFalse(file.exists());
        }
    }

    public void assertFileContents(File dir, String filename, String contentsTest, String encoding) throws IOException {

     *
     * @return {@code true} if operation succeeded, {@code false} if source does not exist.
     * @throws RuntimeException If failed (and not due source not exists).
     */
    boolean get(@Nonnull URI relativeSource, @Nonnull Path target);

    /**
     * GETs the source URI content as byte array. The source MUST BE relative from the {@link RemoteRepository#getUrl()}
     * root.

        emptyDir.mkdirs();
        assertTrue(emptyDir.exists());

        // Simulate the behavior of postVisitDirectory - delete empty directories
        if (emptyDir.isDirectory() && emptyDir.list().length == 0) {
            emptyDir.delete();
        }

        assertFalse(emptyDir.exists());
    }

    // Test FilePurgeVisitor postVisitDirectoryWithException

    /** The object name is invalid */
    int NT_STATUS_OBJECT_NAME_INVALID = 0xC0000033;
    /** The object was not found */
    int NT_STATUS_OBJECT_NAME_NOT_FOUND = 0xC0000034;
    /** The object name already exists */
    int NT_STATUS_OBJECT_NAME_COLLISION = 0xC0000035;
    /** The port is disconnected */
    int NT_STATUS_PORT_DISCONNECTED = 0xC0000037;
    /** The object path is invalid */

	}

	target.SourceBucket = bucket
	var ops []madmin.TargetUpdateType
	if update {
		ops = madmin.GetTargetUpdateOps(r.Form)
	} else {
		var exists bool // true if arn exists
		target.Arn, exists = globalBucketTargetSys.getRemoteARN(bucket, &target, "")
		if exists && target.Arn != "" { // return pre-existing ARN
			data, err := json.Marshal(target.Arn)
			if err != nil {

            if (className.contains(appWebPkg) && className.endsWith(actionSuffix)) {
                // ## Assert ##
                markHere("exists");
                getComponent(clazz); // expect no exception
            }
        });
        assertMarked("exists");
    }
    */

    // ===================================================================================

    assertEquals(100, file.length());
    assertTrue(file.exists());
    out.close();

    // Make sure that finalize deletes the file
    out = null;

    // times out and throws RuntimeException on failure
    GcFinalization.awaitDone(
        new GcFinalization.FinalizationPredicate() {
          @Override
          public boolean isDone() {
            return !file.exists();
          }
        });
  }

}

// ObjectAlreadyExists object already exists.
type ObjectAlreadyExists GenericError

func (e ObjectAlreadyExists) Error() string {
	return "Object: " + e.Bucket + "/" + e.Object + " already exists"
}

// ObjectExistsAsDirectory object already exists as a directory.
type ObjectExistsAsDirectory GenericError

func (e ObjectExistsAsDirectory) Error() string {
	return "Object exists on : " + e.Bucket + " as directory " + e.Object