Shallow rendering is useful to constrain yourself to testing a component as a unit, and to ensure that your tests aren't indirectly asserting on behavior of child components.

As of Enzyme v3, the shallow API does call React lifecycle methods such as componentDidMount and componentDidUpdate. You can read more about this in the version 3 migration guide.

import { shallow } from 'enzyme';
import sinon from 'sinon';
import Foo from './Foo';

describe('', () => {
  it('renders three  components', () => {
    const wrapper = shallow();
    expect(wrapper.find(Foo)).to.have.lengthOf(3);
  });

  it('renders an `.icon-star`', () => {
    const wrapper = shallow();
    expect(wrapper.find('.icon-star')).to.have.lengthOf(1);
  });

  it('renders children when passed in', () => {
    const wrapper = shallow((
      
        
)); expect(wrapper.contains(
)).to.equal(true); }); it('simulates click events', () => { const onButtonClick = sinon.spy(); const wrapper = shallow(); wrapper.find('button').simulate('click'); expect(onButtonClick).to.have.property('callCount', 1); }); });

shallow(node[, options]) => ShallowWrapper

Arguments

  1. node (ReactElement): The node to render
  2. options (Object [optional]):
    • options.context: (Object [optional]): Context to be passed into the component
    • options.disableLifecycleMethods: (Boolean [optional]): If set to true, componentDidMount is not called on the component, and componentDidUpdate is not called after setProps and setContext. Default to false.

Returns

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Neck 18 Tie Blau Men's Blau Seidensticker ShallowWrapper: The wrapper instance around the rendered output.

ShallowWrapper API

.find(selector) => ShallowWrapper

Find every node in the render tree that matches the provided selector.

.findWhere(predicate) => ShallowWrapper

Find every node in the render tree that returns true for the provided predicate function.

.filter(selector) => ShallowWrapper

Remove nodes in the current wrapper that do not match the provided selector.

Neck Seidensticker Blau Men's Tie 18 Blau .filterWhere(predicate) => ShallowWrapper

Remove nodes in the current wrapper that do not return true for the provided predicate function.

.hostNodes() => ShallowWrapper

Removes nodes that are not host nodes; e.g., this will only return HTML nodes.

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Returns whether or not a given node or array of nodes is somewhere in the render tree.

and Formal Pre Stripe Casual Bow black Hanky Tied white DQT Single Tie Men's UA6RgR.containsMatchingElement(node) => Boolean

Returns whether or not a given react element exists in the shallow render tree.

.containsAllMatchingElements(nodes) => Boolean

Returns whether or not all the given react elements exists in the shallow render tree.

.containsAnyMatchingElements(nodes) => Boolean

Returns whether or not one of the given react elements exists in the shallow render tree.

Neck Blau 18 Men's Tie Seidensticker Blau .equals(node) => Boolean

Returns whether or not the current render tree is equal to the given node, based on the expected value.

.matchesElement(node) => Boolean

Returns whether or not a given react element matches the shallow render tree.

.hasClass(className) => Boolean

Returns whether or not the current node has the given class name or not.

.is(selector) => Boolean

Returns whether or not the current node matches a provided selector.

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Returns whether or not the current node exists, or, if given a selector, whether that selector has any matching results.

18 Seidensticker Men's Neck Tie Blau Blau .isEmpty() => Boolean

Deprecated: Use .exists() instead.

.isEmptyRender() => Boolean

Returns whether or not the current component returns a falsy value.

.not(selector) => ShallowWrapper

Remove nodes in the current wrapper that match the provided selector. (inverse of Seidensticker Men's Neck Tie Blau 18 Blau .filter())

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Get a wrapper with all of the children nodes of the current wrapper.

.childAt(index) => ShallowWrapper

Returns a new wrapper with child at the specified index.

.parents() => ShallowWrapper

Get a wrapper with all of the parents (ancestors) of the current node.

.parent() => ShallowWrapper

Get a wrapper with the direct parent of the current node.

.closest(selector) => ShallowWrapper

Get a wrapper with the first ancestor of the current node to match the provided selector.

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Shallow renders the current node and returns a shallow wrapper around it.

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Returns a CheerioWrapper of the current node's subtree.

.unmount() => ShallowWrapper

A method that un-mounts the component.

.text() => StringPolyester Casual Fashionable Tie Lattice Necktie Men for Kxrzu Daily Blue Fashion xYfRwp4q

Returns a string representation of the text nodes in the current render tree.

.html() => String

Returns a static HTML rendering of the current node.

.get(index) => ReactElement

Returns the node at the provided index of the current wrapper.

.getElement() => ReactElement

Returns the wrapped ReactElement.

.getElements() => Array

Returns the wrapped ReactElements.

.at(index) => ShallowWrapper

Returns a wrapper of the node at the provided index of the current wrapper.

.first() => ShallowWrapper

Returns a wrapper of the first node of the current wrapper.

.last() => ShallowWrapper

Returns a wrapper of the last node of the current wrapper.

Blau Blau Tie 18 Neck Seidensticker Men's .state([key]) => Any

Returns the state of the root component.

.context([key]) => Any

Returns the context of the root component.

.props() => Object

Returns the props of the current node.

.prop(key) => Any

Returns the named prop of the current node.

.key() => String

Returns the key of the current node.

.simulate(event[, data]) => ShallowWrapper

Simulates an event on the current node.

Seidensticker Tie Men's Neck Blau 18 Blau .setState(nextState) => ShallowWrapper

Manually sets state of the root component.

.setProps(nextProps[, callback]) => ShallowWrapper

Manually sets props of the root component.

.setContext(context) => ShallowWrapper

Manually sets context of the root component.

.instance() => ReactComponent

Returns the instance of the root component.

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Calls .forceUpdate() on the root component instance.

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Returns a string representation of the current shallow render tree for debugging purposes.

.type() => String|Function|null

Returns the type of the current node of the wrapper.

.name() => String

Returns the name of the current node of the wrapper.

.forEach(fn) => ShallowWrapper

Iterates through each node of the current wrapper and executes the provided function

.map(fn) => Array

Maps the current array of nodes to another array.

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Reduces the current array of nodes to a value

.reduceRight(fn[, initialValue]) => Any

Reduces the current array of nodes to a value, from right to left.

.slice([begin[, end]]) => ShallowWrapper

Returns a new wrapper with a subset of the nodes of the original wrapper, according to the rules of Array#slice.

.tap(intercepter) => Self

Taps into the wrapper method chain. Helpful for debugging.

.some(selector) => Boolean

Blau Neck Men's 18 Blau Seidensticker Tie Returns whether or not any of the nodes in the wrapper match the provided selector.

.someWhere(predicate) => Boolean

Returns whether or not any of the nodes in the wrapper pass the provided predicate function.

.every(selector) => Boolean

Returns whether or not all of the nodes in the wrapper match the provided selector.

.everyWhere(predicate) => Boolean

Returns whether or not all of the nodes in the wrapper pass the provided predicate function.

.dive([options]) => ShallowWrapper

Shallow render the one non-DOM child of the current wrapper, and return a wrapper around the result.