    @Test
    public void keys() throws IOException {

        Set<String> response = new HashSet<String>(Arrays.asList("test-id"));
        when(this.jedisClient.getSessions(SESSIONS_KEY)).thenReturn(response);

        String[] result = this.store.keys();

        assertEquals(1, result.length);
        assertArrayEquals(new String[]{"test-id"}, result);
    }