// test clearing, then setting multiple:
annotations.setAnnotation(TEST_KEY, TEST_VALUE);
assertEquals("Must have the right size key set.",
annotations.getAnnotationKeys().size(), 1);
annotations.clear();
assertEquals("Must have empty key set after clear.",
annotations.getAnnotationKeys().size(), 0);
// test setting many:
for (int i = 0; i < 10; i++) {