GString vs String equality in collections

class StringVersusGStringEqualsInCollections extends GroovyTestCase {

    String string
    GString gString

    void setUp() {
        def g = 'g'
        string = 'groovy'
        gString = "${g}roovy"
    }

    void testEqualsInList() {
        assertEquals([string], [gString])
    }

    void testEqualsInSet() {
        assertEquals([string] as Set, [gString] as Set)
    }

    void testKeyEqualsInMap() {
        String someValue = 'somevalue'
        Map stringMap = [(string): someValue]
        Map gStringMap = [(gString): someValue]
        assertEquals(stringMap, gStringMap)
    }

    void testValueEqualsInMap() {
        String someKey = 'somekey'
        Map stringMap = [(someKey): string]
        Map gStringMap = [(someKey): gString]
        assertEquals(stringMap, gStringMap)
    }
}