[Tests] add some tests

packages/enzyme-test-suite/test/Adapter-spec.jsx

@@ -2,7 +2,7 @@ import React from 'react';
 import { expect } from 'chai';
 import jsdom from 'jsdom';
 import { get } from 'enzyme/build/configuration';
-import { configure, shallow } from 'enzyme';
+import { configure, shallow, EnzymeAdapter } from 'enzyme';
 import inspect from 'object-inspect';
 import {
   Portal,
@@ -77,6 +77,41 @@ describe('Adapter', () => {
     });
   });
 
+  describe('base class', () => {
+    it('constructs', () => {
+      const instance = new EnzymeAdapter();
+      expect(instance).to.have.property('options');
+      expect(instance.options).to.be.an('object');
+    });
+
+    it('throws on abstract methods', () => {
+      expect(() => new EnzymeAdapter().createRenderer()).to.throw(
+        Error,
+        'createRenderer is a required method of EnzymeAdapter, but was not implemented.',
+      );
+      expect(() => new EnzymeAdapter().nodeToElement()).to.throw(
+        Error,
+        'nodeToElement is a required method of EnzymeAdapter, but was not implemented.',
+      );
+      expect(() => new EnzymeAdapter().isValidElement()).to.throw(
+        Error,
+        'isValidElement is a required method of EnzymeAdapter, but was not implemented.',
+      );
+      expect(() => new EnzymeAdapter().createElement()).to.throw(
+        Error,
+        'createElement is a required method of EnzymeAdapter, but was not implemented.',
+      );
+    });
+
+    describe('invokeSetStateCallback', () => {
+      it('has the right length', () => {
+        expect(EnzymeAdapter.prototype).to.have.property('invokeSetStateCallback');
+        expect(EnzymeAdapter.prototype.invokeSetStateCallback).to.be.a('function');
+        expect(EnzymeAdapter.prototype.invokeSetStateCallback).to.have.lengthOf(2);
+      });
+    });
+  });
+
   describeWithDOM('mounted render', () => {
     function hydratedTreeMatchesUnhydrated(element, hydrate = false) {
       const markup = renderToString(element);

packages/enzyme-test-suite/test/shared/methods/@@iterator.jsx

@@ -27,7 +27,7 @@ export default function describeIterator({
         }
       }
       const wrapper = Wrap(<Foo />);
-      const [a, b, c, d] = wrapper.find('a');
+      const [a, b, c, d, ...e] = wrapper.find('a');
       const a1 = wrapper.find('a').get(0);
       const b1 = wrapper.find('a').get(1);
       const c1 = wrapper.find('a').get(2);
@@ -36,6 +36,7 @@ export default function describeIterator({
       expect(b1).to.deep.equal(b);
       expect(c1).to.deep.equal(c);
       expect(d1).to.deep.equal(d);
+      expect(e).to.eql([]);
     });
 
     it('returns an iterable iterator', () => {

packages/enzyme-test-suite/test/shared/methods/context.jsx

@@ -0,0 +1,77 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { expect } from 'chai';
+
+import {
+  itIf,
+} from '../../_helpers';
+import {
+  is,
+} from '../../_helpers/version';
+
+import {
+  createClass,
+} from '../../_helpers/react-compat';
+
+export default function describeContext({
+  Wrap,
+  WrapperName,
+}) {
+  describe('.context()', () => {
+    const contextTypes = {
+      name: PropTypes.string,
+    };
+    const SimpleComponent = createClass({
+      contextTypes,
+      render() {
+        const { name } = this.context;
+        return <div>{name}</div>;
+      },
+    });
+
+    function SimpleComponentSFC(props, { name }) {
+      return <div>{name}</div>;
+    }
+    SimpleComponentSFC.contextTypes = contextTypes;
+
+    it('throws when not called on the root', () => {
+      const context = { name: <main /> };
+      const wrapper = Wrap(<SimpleComponent />, { context });
+      const main = wrapper.find('main');
+      expect(main).to.have.lengthOf(1);
+      expect(() => main.context()).to.throw(
+        Error,
+        `${WrapperName}::context() can only be called on the root`,
+      );
+    });
+
+    it('throws if it is called when wrapper didn’t include context', () => {
+      const wrapper = Wrap(<SimpleComponent />);
+      expect(() => wrapper.context()).to.throw(
+        Error,
+        `${WrapperName}::context() can only be called on a wrapper that was originally passed a context option`,
+      );
+    });
+
+    itIf(is('>= 16'), 'throws on SFCs that lack an instance', () => {
+      const context = { name: 'bob' };
+      const wrapper = Wrap(<SimpleComponentSFC />, { context });
+      expect(() => wrapper.context()).to.throw(
+        Error,
+        `${WrapperName}::context() can only be called on wrapped nodes that have a non-null instance`,
+      );
+    });
+
+    it('works with no arguments', () => {
+      const context = { name: {} };
+      const wrapper = Wrap(<SimpleComponentSFC />, { context });
+      expect(wrapper.context()).to.eql(context);
+    });
+
+    it('works with a key name', () => {
+      const context = { name: {} };
+      const wrapper = Wrap(<SimpleComponentSFC />, { context });
+      expect(wrapper.context('name')).to.equal(context.name);
+    });
+  });
+}

packages/enzyme-test-suite/test/shared/methods/renderProp.jsx

@@ -17,19 +17,19 @@ export default function describeRenderProp({
   wrap()
     .withConsoleThrows()
     .describe('.renderProp()', () => {
-      it('returns a wrapper around the node returned from the render prop', () => {
-        class Foo extends React.Component {
-          render() {
-            return <div className="in-foo" />;
-          }
+      class Foo extends React.Component {
+        render() {
+          return <div className="in-foo" />;
         }
-        class Bar extends React.Component {
-          render() {
-            const { render: r } = this.props;
-            return <div className="in-bar">{r()}</div>;
-          }
+      }
+      class Bar extends React.Component {
+        render() {
+          const { render: r } = this.props;
+          return <div className="in-bar">{r()}</div>;
         }
+      }
 
+      it('returns a wrapper around the node returned from the render prop', () => {
         const wrapperA = Wrap(<div><Bar render={() => <div><Foo /></div>} /></div>);
         const renderPropWrapperA = wrapperA.find(Bar).renderProp('render')();
         expect(renderPropWrapperA.find(Foo)).to.have.lengthOf(1);
@@ -61,18 +61,6 @@ export default function describeRenderProp({
       wrap()
         .withOverride(() => getAdapter(), 'wrap', () => undefined)
         .it('throws with a react adapter that lacks a `.wrap`', () => {
-          class Foo extends React.Component {
-            render() {
-              return <div className="in-foo" />;
-            }
-          }
-          class Bar extends React.Component {
-            render() {
-              const { render: r } = this.props;
-              return <div className="in-bar">{r()}</div>;
-            }
-          }
-
           const wrapper = Wrap(<div><Bar render={() => <div><Foo /></div>} /></div>);
           expect(() => wrapper.find(Bar).renderProp('render')).to.throw(RangeError);
         });

packages/enzyme-test-suite/test/shared/methods/setContext.jsx

@@ -44,6 +44,17 @@ export default function describeSetContext({
       );
     });
 
+    it('throws when not called on the root', () => {
+      const context = { name: <main /> };
+      const wrapper = Wrap(<SimpleComponent />, { context });
+      const main = wrapper.find('main');
+      expect(main).to.have.lengthOf(1);
+      expect(() => main.setContext()).to.throw(
+        Error,
+        `${WrapperName}::setContext() can only be called on the root`,
+      );
+    });
+
     describeIf(is('> 0.13'), 'stateless functional components', () => {
       const SFC = (props, { name }) => (
         <div>{name}</div>

packages/enzyme-test-suite/test/shared/methods/setProps.jsx

@@ -15,6 +15,7 @@ import { is } from '../../_helpers/version';
 
 export default function describeSetProps({
   Wrap,
+  WrapperName,
   isShallow,
 }) {
   describe('.setProps(newProps[, callback)', () => {
@@ -43,6 +44,16 @@ export default function describeSetProps({
       );
     }
 
+    class RendersFoo extends React.Component {
+      render() {
+        return (
+          <main>
+            <Foo {...this.props} />
+          </main>
+        );
+      }
+    }
+
     it('throws on a non-function callback', () => {
       const wrapper = Wrap(<RendersNull />);
 
@@ -54,6 +65,16 @@ export default function describeSetProps({
       expect(() => wrapper.setProps({}, {})).to.throw();
     });
 
+    it('throws when not called on the root', () => {
+      const wrapper = Wrap(<RendersFoo id="a" foo="b" />);
+      const child = wrapper.find(Foo);
+      expect(child).to.have.lengthOf(1);
+      expect(() => child.setProps({})).to.throw(
+        Error,
+        `${WrapperName}::setProps() can only be called on the root`,
+      );
+    });
+
     it('sets props for a component multiple times', () => {
       const wrapper = Wrap(<Foo id="foo" />);
       expect(wrapper.find('.foo')).to.have.lengthOf(1);