使用 Jest 触发方法后检查 Vue 组件数据

Question

我正在尝试使用 Jest 为我的一些组件编写单元测试。 我在这里尝试做的是在触发 toggleExtended 方法后检查 selectedErrand 的输出是否 >= 0。

错误：

Matcher error: received value must be a number

Received has value: undefined

我在这里缺少什么？

将数据设置为 selectedErrands 的默认状态，模拟 toggleExtended 方法，然后检查 selectedErrands 数据（状态）是否根据在我的 Vue 中呈现的列表的索引更改了它的值。

我想我可以做这样的事情。

笑话

it(“Test”, () => {
    wrapper.setData({ selectedErrand: -1 });
    wrapper.vm.toggleExpanded();
    expect(wrapper.vm.selectedErrand).toBeGreaterThanOrEqual(0);
  });

组件

<template>
  <div
    v-if="!error"
    class="flex-table flex-table--white-background flex-table--green-header flex-table--with-dropdown"
    :class="{ loading: loading }"
  >
    <div class="flex-table__row flex-table--header text--level-6">
      <div class="flex-table__cell flex-table__cell--width-3">
        {{ statusHeader }}
      </div>
      <div class="flex-table__cell flex-table__cell--width-3">
        {{ idHeader }}
      </div>
      <div class="flex-table__cell flex-table__cell--width-7">
        {{ descriptionHeader }}
      </div>
      <div class="flex-table__cell flex-table__cell--width-5">
        {{ typeHeader }}
      </div>
      <div class="flex-table__cell flex-table__cell--width-3">
        {{ dateOpenedHeader }}
      </div>
      <div class="flex-table__cell flex-table__cell--width-3">
        {{ dateClosedHeader }}
      </div>
      <div class="flex-table__cell flex-table__cell--width-1" />
    </div>

    <div
      v-for="(errand, index) in sliceArray(errands)"
      :key="!errand.id ? index : errand.id"
    >
      <div
        class="flex-table__row"
        :class="{ 'flex-table__row--closed': index !== selectedErrand }"
        @click="toggleExpanded(index)"
      >
        <div class="flex-table__cell flex-table__cell--width-3">
          {{ errand.status }}
        </div>
        <div class="flex-table__cell flex-table__cell--width-3">
          {{ errand.id }}
        </div>
        <div
          class="flex-table__cell flex-table__cell--width-7 flex-table__cell--show-on-mobile"
          :data-header="descriptionHeader"
        >
          {{ errand.description }}
        </div>
        <div class="flex-table__cell flex-table__cell--width-5">
          {{ errand.type }}
        </div>
        <div
          class="flex-table__cell flex-table__cell--width-3 flex-table__cell--show-on-mobile"
          :data-header="dateOpenedHeader"
        >
          {{ errand.orderDate }}
        </div>
        <div class="flex-table__cell flex-table__cell--width-3">
          {{ errand.deliveryDate }}
        </div>
        <div
          class="flex-table__cell flex-table__cell--width-1 flex-table__cell--dropdown-show-on-mobile"
        >
          <i
            class="icon-angle__small"
            :class="{ 'icon-angle__small--down': selectedErrand === index }"
          />
        </div>
      </div>

      <ErrandsListDetails
        v-if="selectedErrand >= 0 && selectedErrand === index"
        :errand="errand"
        v-bind="$props"
      />
    </div>

    <div
      v-if="errands.length >= numberOfErrandsLoaded"
      class="flex-table--load-more text--level-5"
    >
      <a href="#" @click="loadMore">
        {{ showMoreText }}
        <i class="icon-down" />
      </a>
    </div>
    <div
      v-if="errands.length < 1 && !loading"
      class="flex-table--error text--level-5"
    >
      {{ noCasesText }}
    </div>
    <div v-if="error && !loading" class="flex-table--error text--level-5">
      {{ errorText }}
    </div>
  </div>
</template>

<script>
import _ from "lodash";
import ErrandsListDetails from "./ErrandsListDetails.vue";

export default {
  components: {
    ErrandsListDetails: ErrandsListDetails
  },
  props: {
    componentTitle: {
      type: String,
      default: () => {
        return "";
      }
    },
    showMoreText: {
      type: String,
      default: "Visa fler ärenden"
    },
    statusHeader: {
      type: String,
      default: () => {
        return "Status";
      }
    },
    dateOpenedHeader: {
      type: String,
      default: () => {
        return "Beställt/Anmält";
      }
    },
    dateClosedHeader: {
      type: String,
      default: () => {
        return "Beräknad klar";
      }
    },
    idHeader: {
      type: String,
      default: () => {
        return "Ärendenummer";
      }
    },
    descriptionHeader: {
      type: String,
      default: () => {
        return "Beskrivning";
      }
    },
    typeHeader: {
      type: String,
      default: () => {
        return "Typ";
      }
    },
    fileDetails: {
      type: String,
      default: () => {
        return "Ladda ned beställningen som PDF:";
      }
    },
    commentsDetails: {
      type: String,
      default: () => {
        return "Noteringar";
      }
    },
    wordList: {
      type: String,
      default: () => {
        return "";
      }
    },
    attachment: {
      type: String,
      default: () => {
        return "";
      }
    },
    noCasesText: {
      type: String,
      default: () => {
        return "Det finns inget att visa";
      }
    },
    errorText: {
      type: String,
      default: () => {
        return "Något gick fel";
      }
    },
    createdOnFallback: {
      type: String,
      default: () => {
        return "-";
      }
    },
    closedOnFallback: {
      type: String,
      default: () => {
        return "-";
      }
    },
    errands: {
      type: Array,
      default: () => {
        return [];
      }
    },
    loading: {
      type: Boolean,
      default: () => {
        return false;
      }
    }
  },
  data() {
    return {
      selectedErrand: -1,
      error: undefined,
      numberOfErrandsLoaded: 10
    };
  },
  methods: {
    toggleExpanded: function(index) {
      this.selectedErrand = this.selectedErrand === index ? -1 : index;
    },

    loadMore: function(event) {
      event.preventDefault();
      this.numberOfErrandsLoaded += 10;
    },

    sliceArray: function(array) {
      let val = _.orderBy(array, "orderDate", "desc");
      return val.slice(0, this.numberOfErrandsLoaded);
    }
  }
};
</script>

我希望这已被正确解释，但如果您有任何其他问题，请随时提问。

预先感谢，埃里克

Answer 1

您的函数toggleExpanded期望 number 作为参数

toggleExpanded: function(index) {
  this.selectedErrand = this.selectedErrand === index ? -1 : index;
}

但是，您没有通过任何东西。 selectedErrand值最初是 -1 因此你最终得到-1 === undefined并最终在this.selectedErrand得到undefined 。

您应该在调用toggleExpanded时传递索引。

wrapper.vm.toggleExpanded(1);