MultisetTest.java

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package org.openjdk.jmh.util;

import static org.junit.Assert.*;
import org.junit.Test;

public class MultisetTest {
    @Test
    public void testClear() {
        Multiset<String> set = new HashMultiset<>();
        set.add("one");
        set.add("two", 2);
        assertFalse(set.isEmpty());
        assertEquals(3, set.size());
        assertEquals(2, set.keys().size());
        assertEquals(1, set.count("one"));
        assertEquals(2, set.count("two"));

        // clear the set
        set.clear();
        assertTrue(set.isEmpty());
        assertEquals(0, set.size());
        assertEquals(0, set.keys().size());
        assertEquals(0, set.count("one"));
        assertEquals(0, set.count("two"));

        // reuse the set
        set.add("one");
        set.add("two", 2);
        assertFalse(set.isEmpty());
        assertEquals(3, set.size());
        assertEquals(2, set.keys().size());
        assertEquals(1, set.count("one"));
        assertEquals(2, set.count("two"));
    }
}