// Then
        assertEquals(nextReferral, result);
        verify(mockReferralData).next();
    }

    @Test
    @DisplayName("Should get link")
    void testGetLink() {
        // Given
        String link = "/test/link";
        when(mockReferralData.getLink()).thenReturn(link);

        // When
        String result = mockReferralData.getLink();

        // Then