server/src/test/java/com/vaadin/ui/ComboBoxTest.java


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package com.vaadin.ui;

import org.junit.Test;

import com.vaadin.server.ServerRpcManager;
import com.vaadin.shared.data.selection.SelectionServerRpc;
import com.vaadin.tests.util.MockUI;

public class ComboBoxTest {

    @Test
    public void testResetValue() {
        ComboBox<String> comboBox = new ComboBox<>();
        comboBox.setItems("one", "two");

        // Reset value whenever it changes (in a real case, this listener would
        // do something with the selected value before discarding it)
        comboBox.addValueChangeListener(event -> comboBox.setValue(null));

        // "Attach" the component and initialize diffstate
        new MockUI().setContent(comboBox);
        ComponentTest.syncToClient(comboBox);

        // Emulate selection of "one"
        String oneKey = comboBox.getDataCommunicator().getKeyMapper()
                .key("one");
        ServerRpcManager.getRpcProxy(comboBox, SelectionServerRpc.class)
                .select(oneKey);

        ComponentTest.assertEncodedStateProperties(comboBox,
                "Selection change done by the listener should be sent to the client",
                "selectedItemKey");
    }
}