package com.vaadin.tests.components.table;

import com.vaadin.data.Item;
import com.vaadin.data.Property;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.data.util.IndexedContainer;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.ui.Table;
import com.vaadin.ui.TextField;

public class HugeRowCount extends TestBase {

    private MockupContainer container;

    @Override
    protected void setup() {

        container = new MockupContainer();
        container.setSize(100000);

        final TextField tf = new TextField("Rows");
        tf.setValue(100000);
        tf.addListener(new Property.ValueChangeListener() {
            public void valueChange(ValueChangeEvent event) {
                container.setSize(Integer.parseInt(tf.getValue().toString()));
            }
        });
        addComponent(tf);
        addComponent(new Button("Update rowcount"));

        Table t = new Table();
        t.setWidth("400px");
        t.setRowHeaderMode(Table.ROW_HEADER_MODE_INDEX);
        t.setContainerDataSource(container);

        addComponent(t);

    }

    class MockupContainer extends IndexedContainer {

        private Item item;
        private Object addItem;

        public MockupContainer() {
            addContainerProperty("foo", String.class, "bar");
            addItem = addItem();
            item = getItem(addItem);
        }

        private int size;

        public void setSize(int size) {
            this.size = size;
            fireContentsChange(-1);
        }

        @Override
        public int size() {
            return size;
        }

        @Override
        public Item getItem(Object itemId) {
            return item;
        }

        @Override
        public Object getIdByIndex(int index) {
            return addItem;
        }

    }

    @Override
    protected String getDescription() {
        return "Should work as well as possible";
    }

    @Override
    protected Integer getTicketNumber() {
        return 4220;
    }

}

package com.vaadin.tests.components.table;

import com.vaadin.data.Item;
import com.vaadin.data.Property;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.data.util.IndexedContainer;
import com.vaadin.tests.components.TestBase;
import com.vaadin.ui.Button;
import com.vaadin.ui.Table;
import com.vaadin.ui.TextField;

public class HugeRowCount extends TestBase {

    private MockupContainer container;

    @Override
    protected void setup() {

        container = new MockupContainer();
        container.setSize(100000);

        final TextField tf = new TextField("Rows");
        tf.setValue(100000);
        tf.addListener(new Property.ValueChangeListener() {
            public void valueChange(ValueChangeEvent event) {
                container.setSize(Integer.parseInt(tf.getValue().toString()));
            }
        });
        addComponent(tf);
        addComponent(new Button("Update rowcount"));

        Table t = new Table();
        t.setWidth("400px");
        t.setRowHeaderMode(Table.ROW_HEADER_MODE_INDEX);
        t.setContainerDataSource(container);

        addComponent(t);

    }

    class MockupContainer extends IndexedContainer {

        private Item item;
        private Object addItem;

        public MockupContainer() {
            addContainerProperty("foo", String.class, "bar");
            addItem = addItem();
            item = getItem(addItem);
        }

        private int size;

        public void setSize(int size) {
            this.size = size;
            fireItemSetChange();
        }

        @Override
        public int size() {
            return size;
        }

        @Override
        public Item getItem(Object itemId) {
            return item;
        }

        @Override
        public Object getIdByIndex(int index) {
            return addItem;
        }

    }

    @Override
    protected String getDescription() {
        return "Should work as well as possible";
    }

    @Override
    protected Integer getTicketNumber() {
        return 4220;
    }

}

Use more appropriate item set change notification method in test.