/
ShallowWrapper.js
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/
ShallowWrapper.js
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import React from 'react';
import { flatten, unique, compact } from 'underscore';
import cheerio from 'cheerio';
import {
nodeEqual,
propFromEvent,
withSetStateAllowed,
propsOfNode,
} from './Utils';
import {
debugNodes,
} from './Debug';
import {
getTextFromNode,
hasClassName,
childrenOfNode,
parentsOfNode,
treeFilter,
buildPredicate,
} from './ShallowTraversal';
import {
createShallowRenderer,
renderToStaticMarkup,
} from './react-compat';
/**
* Finds all nodes in the current wrapper nodes' render trees that match the provided predicate
* function.
*
* @param {ShallowWrapper} wrapper
* @param {Function} predicate
* @returns {ShallowWrapper}
*/
function findWhereUnwrapped(wrapper, predicate) {
return wrapper.flatMap(n => treeFilter(n.node, predicate));
}
/**
* Returns a new wrapper instance with only the nodes of the current wrapper instance that match
* the provided predicate function.
*
* @param {ShallowWrapper} wrapper
* @param {Function} predicate
* @returns {ShallowWrapper}
*/
function filterWhereUnwrapped(wrapper, predicate) {
return wrapper.wrap(compact(wrapper.nodes.filter(predicate)));
}
/**
* @class ShallowWrapper
*/
export default class ShallowWrapper {
constructor(nodes, root, options = {}) {
if (!root) {
this.root = this;
this.unrendered = nodes;
this.renderer = createShallowRenderer();
this.renderer.render(nodes, options.context);
this.node = this.renderer.getRenderOutput();
this.nodes = [this.node];
this.length = 1;
} else {
this.root = root;
this.unrendered = null;
this.renderer = null;
if (!Array.isArray(nodes)) {
this.node = nodes;
this.nodes = [nodes];
} else {
this.node = nodes[0];
this.nodes = nodes;
}
this.length = this.nodes.length;
}
this.options = options;
}
/**
* Gets the instance of the component being rendered as the root node passed into `shallow()`.
*
* NOTE: can only be called on a wrapper instance that is also the root instance.
*
* Example:
* ```
* const wrapper = shallow(<MyComponent />);
* const inst = wrapper.instance();
* expect(inst).to.be.instanceOf(MyComponent);
* ```
* @returns {ReactComponent}
*/
instance() {
return this.renderer._instance._instance;
}
/**
* Forces a re-render. Useful to run before checking the render output if something external
* may be updating the state of the component somewhere.
*
* NOTE: can only be called on a wrapper instance that is also the root instance.
*
* @returns {ShallowWrapper}
*/
update() {
if (this.root !== this) {
throw new Error('ShallowWrapper::update() can only be called on the root');
}
this.single(() => {
this.node = this.renderer.getRenderOutput();
this.nodes = [this.node];
});
return this;
}
/**
* A method that sets the props of the root component, and re-renders. Useful for when you are
* wanting to test how the component behaves over time with changing props. Calling this, for
* instance, will call the `componentWillReceiveProps` lifecycle method.
*
* Similar to `setState`, this method accepts a props object and will merge it in with the already
* existing props.
*
* NOTE: can only be called on a wrapper instance that is also the root instance.
*
* @param {Object} props object
* @returns {ShallowWrapper}
*/
setProps(props) {
if (this.root !== this) {
throw new Error('ShallowWrapper::setProps() can only be called on the root');
}
this.single(() => {
withSetStateAllowed(() => {
this.unrendered = React.cloneElement(this.unrendered, props);
this.renderer.render(this.unrendered);
this.update();
});
});
return this;
}
/**
* A method to invoke `setState` on the root component instance similar to how you might in the
* definition of the component, and re-renders. This method is useful for testing your component
* in hard to achieve states, however should be used sparingly. If possible, you should utilize
* your component's external API in order to get it into whatever state you want to test, in order
* to be as accurate of a test as possible. This is not always practical, however.
*
* NOTE: can only be called on a wrapper instance that is also the root instance.
*
* @param {Object} state to merge
* @returns {ShallowWrapper}
*/
setState(state) {
if (this.root !== this) {
throw new Error('ShallowWrapper::setState() can only be called on the root');
}
this.single(() => {
withSetStateAllowed(() => {
this.instance().setState(state);
this.update();
});
});
return this;
}
/**
* A method that sets the context of the root component, and re-renders. Useful for when you are
* wanting to test how the component behaves over time with changing contexts.
*
* NOTE: can only be called on a wrapper instance that is also the root instance.
*
* @param {Object} context object
* @returns {ShallowWrapper}
*/
setContext(context) {
if (this.root !== this) {
throw new Error('ShallowWrapper::setContext() can only be called on the root');
}
if (!this.options.context) {
throw new Error(
'ShallowWrapper::setContext() can only be called on a wrapper that was originally passed ' +
'a context option'
);
}
this.renderer.render(this.unrendered, context);
this.update();
return this;
}
/**
* Whether or not a given react element exists in the shallow render tree.
*
* Example:
* ```
* const wrapper = shallow(<MyComponent />);
* expect(wrapper.contains(<div className="foo bar" />)).to.be.true;
* ```
*
* @param {ReactElement} node
* @returns {Boolean}
*/
contains(node) {
return findWhereUnwrapped(this, other => nodeEqual(node, other)).length > 0;
}
/**
* Finds every node in the render tree of the current wrapper that matches the provided selector.
*
* @param {String|Function} selector
* @returns {ShallowWrapper}
*/
find(selector) {
const predicate = buildPredicate(selector);
return findWhereUnwrapped(this, predicate);
}
/**
* Returns whether or not current node matches a provided selector.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @param {String|Function} selector
* @returns {boolean}
*/
is(selector) {
const predicate = buildPredicate(selector);
return this.single(predicate);
}
/**
* Returns a new wrapper instance with only the nodes of the current wrapper instance that match
* the provided predicate function. The predicate should receive a wrapped node as its first
* argument.
*
* @param {Function} predicate
* @returns {ShallowWrapper}
*/
filterWhere(predicate) {
return filterWhereUnwrapped(this, n => predicate(this.wrap(n)));
}
/**
* Returns a new wrapper instance with only the nodes of the current wrapper instance that match
* the provided selector.
*
* @param {String|Function} selector
* @returns {ShallowWrapper}
*/
filter(selector) {
const predicate = buildPredicate(selector);
return filterWhereUnwrapped(this, predicate);
}
/**
* Returns a new wrapper instance with only the nodes of the current wrapper that did not match
* the provided selector. Essentially the inverse of `filter`.
*
* @param {String|Function} selector
* @returns {ShallowWrapper}
*/
not(selector) {
const predicate = buildPredicate(selector);
return filterWhereUnwrapped(this, n => !predicate(n));
}
/**
* Returns a string of the rendered text of the current render tree. This function should be
* looked at with skepticism if being used to test what the actual HTML output of the component
* will be. If that is what you would like to test, use enzyme's `render` function instead.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @returns {String}
*/
text() {
return this.single(getTextFromNode);
}
/**
* Returns the HTML of the node.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @returns {String}
*/
html() {
return this.single(renderToStaticMarkup);
}
/**
* Returns the current node rendered to HTML and wrapped in a CheerioWrapper.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @returns {CheerioWrapper}
*/
render() {
return cheerio.load(this.html()).root();
}
/**
* Used to simulate events. Pass an eventname and (optionally) event arguments. This method of
* testing events should be met with some skepticism.
*
* @param {String} event
* @param {Array} args
* @returns {ShallowWrapper}
*/
simulate(event, ...args) {
const handler = this.prop(propFromEvent(event));
if (handler) {
withSetStateAllowed(() => {
// TODO(lmr): create/use synthetic events
// TODO(lmr): emulate React's event propagation
handler(...args);
this.root.update();
});
}
return this;
}
/**
* Returns the props hash for the root node of the wrapper.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @returns {Object}
*/
props() {
return this.single(propsOfNode);
}
/**
* Returns the state hash for the root node of the wrapper. Optionally pass in a prop name and it
* will return just that value.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @param {String} name (optional)
* @returns {*}
*/
state(name) {
if (this.root !== this) {
throw new Error('ShallowWrapper::state() can only be called on the root');
}
const _state = this.single(() => this.instance().state);
if (name !== undefined) {
return _state[name];
}
return _state;
}
/**
* Returns a new wrapper with all of the children of the current wrapper.
*
* @param {String|Function} [selector]
* @returns {ShallowWrapper}
*/
children(selector) {
const allChildren = this.flatMap(n => childrenOfNode(n.node));
return selector ? allChildren.filter(selector) : allChildren;
}
/**
* Returns a wrapper around all of the parents/ancestors of the wrapper. Does not include the node
* in the current wrapper.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @param {String|Function} [selector]
* @returns {ShallowWrapper}
*/
parents(selector) {
const allParents = this.wrap(this.single(n => parentsOfNode(n, this.root.node)));
return selector ? allParents.filter(selector) : allParents;
}
/**
* Returns a wrapper around the immediate parent of the current node.
*
* @returns {ShallowWrapper}
*/
parent() {
return this.flatMap(n => [n.parents().get(0)]);
}
/**
*
* @param {String|Function} selector
* @returns {ShallowWrapper}
*/
closest(selector) {
return this.is(selector) ? this : this.parents().filter(selector).first();
}
/**
* Shallow renders the current node and returns a shallow wrapper around it.
*
* NOTE: can only be called on wrapper of a single node.
*
* @returns {ShallowWrapper}
*/
shallow() {
return this.single((n) => new ShallowWrapper(n));
}
/**
* Returns the value of prop with the given name of the root node.
*
* @param propName
* @returns {*}
*/
prop(propName) {
return this.props()[propName];
}
/**
* Returns the type of the root ndoe of this wrapper. If it's a composite component, this will be
* the component constructor. If it's native DOM node, it will be a string.
*
* @returns {String|Function}
*/
type() {
return this.single(n => n.type);
}
/**
* Returns whether or not the current root node has the given class name or not.
*
* NOTE: can only be called on a wrapper of a single node.
*
* @param className
* @returns {Boolean}
*/
hasClass(className) {
if (className && className.indexOf('.') !== -1) {
console.warn(
'It looks like you\'re calling `ShallowWrapper::hasClass()` with a CSS selector. ' +
'hasClass() expects a class name, not a CSS selector.'
);
}
return this.single(n => hasClassName(n, className));
}
/**
* Iterates through each node of the current wrapper and executes the provided function with a
* wrapper around the corresponding node passed in as the first argument.
*
* @param {Function} fn
* @returns {ShallowWrapper}
*/
forEach(fn) {
this.nodes.forEach((n, i) => fn.call(this, this.wrap(n), i));
return this;
}
/**
* Maps the current array of nodes to another array. Each node is passed in as a `ShallowWrapper`
* to the map function.
*
* @param {Function} fn
* @returns {Array}
*/
map(fn) {
return this.nodes.map((n, i) => fn.call(this, this.wrap(n), i));
}
/**
* Reduces the current array of nodes to a value. Each node is passed in as a `ShallowWrapper`
* to the reducer function.
*
* @param {Function} fn - the reducer function
* @param {*} initialValue - the initial value
* @returns {*}
*/
reduce(fn, initialValue) {
return this.nodes.reduce(
(accum, n, i) => fn.call(this, accum, this.wrap(n), i),
initialValue
);
}
/**
* Reduces the current array of nodes to another array, from right to left. Each node is passed
* in as a `ShallowWrapper` to the reducer function.
*
* @param {Function} fn - the reducer function
* @param {*} initialValue - the initial value
* @returns {*}
*/
reduceRight(fn, initialValue) {
return this.nodes.reduceRight(
(accum, n, i) => fn.call(this, accum, this.wrap(n), i),
initialValue
);
}
/**
* Returns whether or not any of the nodes in the wrapper match the provided selector.
*
* @param {Function|String} selector
* @returns {Boolean}
*/
some(selector) {
const predicate = buildPredicate(selector);
return this.nodes.some(predicate);
}
/**
* Returns whether or not any of the nodes in the wrapper pass the provided predicate function.
*
* @param {Function} predicate
* @returns {Boolean}
*/
someWhere(predicate) {
return this.nodes.some((n, i) => predicate.call(this, this.wrap(n), i));
}
/**
* Returns whether or not all of the nodes in the wrapper match the provided selector.
*
* @param {Function|String} selector
* @returns {Boolean}
*/
every(selector) {
const predicate = buildPredicate(selector);
return this.nodes.every(predicate);
}
/**
* Returns whether or not any of the nodes in the wrapper pass the provided predicate function.
*
* @param {Function} predicate
* @returns {Boolean}
*/
everyWhere(predicate) {
return this.nodes.every((n, i) => predicate.call(this, this.wrap(n), i));
}
/**
* Utility method used to create new wrappers with a mapping function that returns an array of
* nodes in response to a single node wrapper. The returned wrapper is a single wrapper around
* all of the mapped nodes flattened (and de-duplicated).
*
* @param {Function} fn
* @returns {ShallowWrapper}
*/
flatMap(fn) {
const nodes = this.nodes.map((n, i) => fn.call(this, this.wrap(n), i));
const flattened = flatten(nodes, true);
const uniques = unique(flattened);
return this.wrap(uniques);
}
/**
* Finds all nodes in the current wrapper nodes' render trees that match the provided predicate
* function. The predicate function will receive the nodes inside a ShallowWrapper as its
* first argument.
*
* @param {Function} predicate
* @returns {ShallowWrapper}
*/
findWhere(predicate) {
return findWhereUnwrapped(this, n => predicate(this.wrap(n)));
}
/**
* Returns the node at a given index of the current wrapper.
*
* @param index
* @returns {ReactElement}
*/
get(index) {
return this.nodes[index];
}
/**
* Returns a wrapper around the node at a given index of the current wrapper.
*
* @param index
* @returns {ShallowWrapper}
*/
at(index) {
return this.wrap(this.nodes[index]);
}
/**
* Returns a wrapper around the first node of the current wrapper.
*
* @returns {ShallowWrapper}
*/
first() {
return this.at(0);
}
/**
* Returns a wrapper around the last node of the current wrapper.
*
* @returns {ShallowWrapper}
*/
last() {
return this.at(this.length - 1);
}
/**
* Returns true if the current wrapper has no nodes. False otherwise.
*
* @returns {boolean}
*/
isEmpty() {
return this.length === 0;
}
/**
* Utility method that throws an error if the current instance has a length other than one.
* This is primarily used to enforce that certain methods are only run on a wrapper when it is
* wrapping a single node.
*
* @param fn
* @returns {*}
*/
single(fn) {
if (this.length !== 1) {
throw new Error(
`This method is only meant to be run on single node. ${this.length} found instead.`
);
}
return fn.call(this, this.node);
}
/**
* Helpful utility method to create a new wrapper with the same root as the current wrapper, with
* any nodes passed in as the first parameter automatically wrapped.
*
* @param node
* @returns {ShallowWrapper}
*/
wrap(node) {
if (node instanceof ShallowWrapper) {
return node;
}
return new ShallowWrapper(node, this.root);
}
/**
* Returns an html-like string of the shallow render for debugging purposes.
*
* @returns {String}
*/
debug() {
return debugNodes(this.nodes);
}
}