source: class PrefixControllerTest  {
  
      private static final String urlTemplate;
  
      @WithMockUser(roles = "ADMIN")
      @Test
      public void testDeleteAll() throws Exception {
  
target:         DiscordSnowflake guildId = generateUniqueSnowflakeId();
          DiscordSnowflake botId = generateUniqueSnowflakeId();
  
          String[] current = this.mapper.readValue(this.mockMvc.perform(get(urlTemplate, guildId, botId))
                  .andReturn()
                  .getResponse().getContentAsString(), com.fredboat.backend.quarterdeck.rest.v1.transfer.Prefix.class)
                  .getPrefixes();
  
          this.mockMvc.perform(
                  delete(urlTemplate, guildId, botId)
                          .content(this.mapper.writeValueAsString(current))
                          .contentType(MediaType.APPLICATION_JSON))
                  .andExpect(status().isOk())
                  .andExpect(content().contentType(MediaType.APPLICATION_JSON_VALUE))
                  .andExpect(jsonPath("$.guildId", both(isA(String.class)).and(is(guildId.getSnowflakeId()))))
                  .andExpect(jsonPath("$.botId", both(isA(String.class)).and(is(botId.getSnowflakeId()))))
                  //ensure the default ones are returned after emptying it completely
                  .andExpect(jsonPath("$.prefixes", hasItems(Prefix.DEFAULT_PREFIXES.toArray(new String[0]))))
                  .andExpect(jsonPath("$.prefixes.length()", is(Prefix.DEFAULT_PREFIXES.size())));
      }
  
  }