Jest testing in a Vue child component is failing due to the presence of lodash

Question

Jest testing in a Vue child component is failing due to the presence of lodash

In this specific instance of my Vue app, I have globally loaded lodash as a Vue plugin in the main.js file:

import _ from "lodash"

export default function install(Vue) {
    Vue.prototype._ = _
    Vue.mixin({
        computed: {
            _: () => _
        }
    })
}

Now, I encountered an issue when trying to shallowMount the parent component of a child element that uses a lodash function. The test failed with the following error message:

ReferenceError: _ is not defined

      270 |         },
    > 272 |         debouncedSearch: _.debounce(
          | ^
      273 |             function (value) {
      274 |                 this.currentQuery = value
      275 |                 if (!_.isEmpty(this.currentQuery)) {

Any insights on what could be missing here?

Solution:

Further investigation led me to import debounce using

import debounce from "lodash/debounce"

and replace _.debounce() with just debounce. After making these changes, the issue was resolved.

javascript unit-testing vue.js jestjs

Answer 1

Answer №1

Consider restructuring your code as shown below:

// Lodash is not defined globally
debouncedSearch: function() {
    // However, it is accessible within this scope
    return _.debounce(
        ...
    );
}

Answer 2

Consider restructuring your code as shown below:

// Lodash is not defined globally
debouncedSearch: function() {
    // However, it is accessible within this scope
    return _.debounce(
        ...
    );
}

Jest testing in a Vue child component is failing due to the presence of lodash

Answer №1

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