test(Dropdown): add test for Dropdown (#1516)

* test(Dropdown): add test for Dropdown

* test(Dropdown): add test for Dropdown

src/dropdown/__tests__/index.test.js

@@ -0,0 +1,179 @@
+import { mount } from '@vue/test-utils';
+import { jest, expect, it } from '@jest/globals';
+import { Dropdown, DropdownMenu, DropdownItem } from '../index';
+
+// every component needs four parts: props/events/slots/functions.
+describe('Dropdown', () => {
+  const props = {
+    options: [
+      {
+        content: '操作一',
+        value: 1,
+      },
+      {
+        content: '操作二',
+        value: 2,
+      },
+      {
+        content: '操作三',
+        value: 3,
+      },
+    ],
+  };
+
+  it('equals disable to true', () => {
+    const wrapper = mount(Dropdown, {
+      propsData: {
+        disabled: true,
+      },
+    });
+
+    expect(wrapper.props().disabled).toEqual(true);
+  });
+
+  it('should emit click event', () => {
+    const onClick = jest.fn();
+    const dropdownWrapper = mount({
+      render() {
+        return <Dropdown options={props.options} onClick={onClick}></Dropdown>;
+      },
+    }).findComponent(Dropdown);
+    const wrapper = mount({
+      provide() {
+        return {
+          dropdown: dropdownWrapper.vm,
+        };
+      },
+      render() {
+        return <DropdownMenu></DropdownMenu>;
+      },
+    });
+    wrapper.find('.t-dropdown__item').trigger('click');
+    expect(onClick).toBeCalled();
+  });
+
+  it('should exits divider', () => {
+    const options = [
+      {
+        content: '操作一',
+        value: 1,
+      },
+      {
+        content: '操作二',
+        value: 2,
+        divider: true,
+      },
+      {
+        content: '操作三',
+        value: 3,
+      },
+    ];
+    const dropdownWrapper = mount({
+      render() {
+        return <Dropdown options={options}></Dropdown>;
+      },
+    }).findComponent(Dropdown);
+    const wrapper = mount({
+      provide() {
+        return {
+          dropdown: dropdownWrapper.vm,
+        };
+      },
+      render() {
+        return <DropdownMenu></DropdownMenu>;
+      },
+    });
+    expect(wrapper.find('.t-divider').element.parentElement.textContent).toBe(options[1].content);
+  });
+
+  it('should equals custom height', () => {
+    const options = Array.from({ length: 20 }).map((v, k) => ({
+      content: `操作${k + 1}`,
+      value: k + 1,
+    }));
+    const maxHeight = 400;
+    const minColumnWidth = 88;
+    const dropdownWrapper = mount({
+      render() {
+        return <Dropdown options={options} maxHeight={maxHeight} minColumnWidth={minColumnWidth}></Dropdown>;
+      },
+    }).findComponent(Dropdown);
+    const wrapper = mount({
+      provide() {
+        return {
+          dropdown: dropdownWrapper.vm,
+        };
+      },
+      render() {
+        return <DropdownMenu></DropdownMenu>;
+      },
+    }).findComponent(DropdownMenu);
+    expect(wrapper.find('.t-dropdown__menu-column').exists()).toBe(true);
+    expect(wrapper.find('.t-dropdown__menu-column').element.style.maxHeight).toBe(`${maxHeight}px`);
+    expect(wrapper.find('.t-dropdown__menu-column').element.style.minWidth).toBe(`${minColumnWidth}px`);
+  });
+
+  it('should handle each option of click event', () => {
+    const options = [
+      {
+        content: '操作一',
+        value: 1,
+        onClick: jest.fn(),
+      },
+      {
+        content: '操作二',
+        value: 2,
+        onClick: jest.fn(),
+      },
+      {
+        content: '操作三',
+        value: 3,
+        onClick: jest.fn(),
+      },
+    ];
+    const dropdownWrapper = mount({
+      render() {
+        return <Dropdown options={options}></Dropdown>;
+      },
+    }).findComponent(Dropdown);
+    const wrapper = mount({
+      provide() {
+        return {
+          dropdown: dropdownWrapper.vm,
+        };
+      },
+      render() {
+        return <DropdownMenu></DropdownMenu>;
+      },
+    }).findComponent(DropdownMenu);
+    wrapper.findAll('.t-dropdown__item-text').trigger('click');
+    options.forEach((value) => {
+      expect(value.onClick).toBeCalled();
+    });
+  });
+
+  it('use dropdown by slots', async () => {
+    const wrapper = mount({
+      render() {
+        return (
+          <Dropdown trigger="click">
+            <div>menu</div>
+            <template slot="dropdown">
+              <DropdownMenu>
+                <DropdownItem class="op1" value={1}>
+                  操作一
+                </DropdownItem>
+                <DropdownItem value={2}>操作二</DropdownItem>
+                <DropdownItem value={3}>操作三</DropdownItem>
+                <DropdownItem value={4}>操作四</DropdownItem>
+                <DropdownItem value={5}>操作五</DropdownItem>
+              </DropdownMenu>
+            </template>
+          </Dropdown>
+        );
+      },
+    });
+    await wrapper.trigger('click');
+    expect(document.querySelector('.op1')).not.toBe(null);
+  });
+});