createCallback.Before("*").Register("c1", c1)
	if cb := createCallback.Get("c1"); reflect.DeepEqual(cb, c1) {
		t.Errorf("callbacks tests failed, got: %p, want: %p", cb, c1)
	}

	createCallback.Remove("c1")
	if cb := createCallback.Get("c2"); cb != nil {
		t.Errorf("callbacks test failed. got: %p, want: nil", cb)
	}
}

func TestCallbacksRemove(t *testing.T) {
	db, _ := gorm.Open(nil, nil)

            if (configuration == null) {
                configuration = XmlNode.newInstance("configuration");
            }
            UnaryOperator<String> cb = Interpolator.memoize(callback);
            UnaryOperator<String> it = s -> interpolator.interpolate(s, cb);
            configuration = new ExtensionInterpolator(it).transform(configuration);

            binder.bind(XmlNode.class)

            logger.debug("Scheduling: {}", projectSegment.getProject());
            Callable<ProjectSegment> cb =
                    createBuildCallable(rootSession, projectSegment, reactorContext, taskSegment, duplicateArtifactIds);
            service.submit(cb);
        }

        // for each finished project
        for (int i = 0; i < analyzer.getNumberOfBuilds(); i++) {
            try {

            if (configuration == null) {
                configuration = XmlNode.newInstance("configuration");
            }
            UnaryOperator<String> cb = Interpolator.memoize(callback);
            UnaryOperator<String> it = s -> interpolator.interpolate(s, cb);
            configuration = new ExtensionInterpolator(it).transform(configuration);

            binder.bind(XmlNode.class)

        return new DefaultInterpolator();
    }

    @Nonnull
    public static UnaryOperator<String> prefix(String prefix, UnaryOperator<String> cb) {
        return s -> {
            String v = null;
            if (s.startsWith(prefix)) {
                v = cb.apply(s.substring(prefix.length()));
            }
            return v;
        };
    }

    @SafeVarargs
    @Nonnull

  private static Readable wrapAsGenericReadable(Readable a) {
    return new Readable() {
      @Override
      public int read(CharBuffer cb) throws IOException {
        return a.read(cb);
      }
    };
  }

  private static Readable wrapAsGenericReadable(Readable a) {
    return new Readable() {
      @Override
      public int read(CharBuffer cb) throws IOException {
        return a.read(cb);
      }
    };
  }

	// Compress only if the compression is enabled during initial multipart.
	var idxCb func() []byte
	if isCompressed {
		wantEncryption := crypto.Requested(r.Header) || isEncrypted
		s2c, cb := newS2CompressReader(reader, actualPartSize, wantEncryption)
		idxCb = cb
		defer s2c.Close()
		reader = etag.Wrap(s2c, reader)
		length = -1
	}

	srcInfo.Reader, err = hash.NewReader(ctx, reader, length, "", "", actualPartSize)
	if err != nil {

    }

    private static UnaryOperator<String> prefix(String prefix, UnaryOperator<String> cb) {
        return s -> {
            String v = null;
            if (s.startsWith(prefix)) {
                v = cb.apply(s.substring(prefix.length()));
            }
            return v;
        };
    }

    Traverser<Character> traverser = Traverser.forGraph(MULTI_GRAPH);
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("ac")), "acbd");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("cb")), "cbad");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("db")), "db");
    assertEqualCharNodes(traverser.breadthFirst(charactersOf("d")), "d");
  }

  @Test