feat(project): add dropdown component

src/components/Dropdown/Dropdown.module.scss

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+$select-border: #777;
+$select-focus: blue;
+$select-arrow: $select-border;
+
+select {
+  appearance: none;
+  background-color: transparent;
+  border: none;
+  padding: 0 1em 0 0;
+  margin: 0;
+  width: 100%;
+  font-family: inherit;
+  font-size: 1rem;
+  font-weight: 700;
+  cursor: inherit;
+  line-height: inherit;
+  z-index: 1;
+  outline: none;
+
+    // Remove IE arrow
+    &::-ms-expand {
+      display: none;
+    }
+}
+
+.dropdown {
+  display: grid;
+  grid-template-areas: "select";
+  align-items: center;
+  position: relative;
+  min-width: 10ch;
+  max-width: 20ch;
+  border: 1px solid $select-border;
+  border-radius: 0.25em;
+  padding: 0.5em 0.8em;
+  font-size: 1.25rem;
+  cursor: pointer;
+  line-height: 1.1;
+  background-color: #fff;
+  background-image: linear-gradient(to top, #f9f9f9, #fff 33%);
+
+  select,
+  &::after {
+    grid-area: select;
+  }
+
+  // Custom arrow
+  &::after {
+    content: "";
+    justify-self: end;
+    width: 0.6em;
+    height: 0.4em;
+    background-color: $select-arrow;
+    clip-path: polygon(100% 0%, 0 0%, 50% 100%);
+  }
+
+  &:focus + .focus {
+    position: absolute;
+    top: -1px;
+    left: -1px;
+    right: -1px;
+    bottom: -1px;
+    border: 2px solid $select-focus;
+    border-radius: inherit;
+  }
+
+  & .disabled {
+    cursor: not-allowed;
+    background-color: #eee;
+    background-image: linear-gradient(to top, #ddd, #eee 33%);
+    }
+}
+
+option {
+  white-space: normal;
+
+  // Set focus on chrome
+  outline-color: $select-focus;
+}

src/components/Dropdown/Dropdown.test.tsx

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+import * as React from 'react';
+import { render } from '@testing-library/react';
+
+import Dropdown from './Dropdown';
+
+const options = ["x", "y", "z"]
+
+describe('<Dropdown>', () => {
+  it('renders dropdown', () => {
+    const { getByText } = render((
+      <Dropdown
+        name="categories"
+        value="aa"
+        defaultLabel="bb"
+        options={options}
+        setValue={(event) => event}
+      />));
+    const dropdown = getByText(/bb/i);
+    expect(document.body.contains(dropdown));
+  });
+});

src/components/Dropdown/Dropdown.tsx

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+import React from 'react';
+
+import styles from './Dropdown.module.scss';
+
+type DropdownProps = {
+  name: string;
+  value: string;
+  defaultLabel: string;
+  options: string[];
+  setValue: ((value: string) => void);
+};
+
+function Dropdown({
+  name,
+  value,
+  defaultLabel,
+  options,
+  setValue
+}: DropdownProps) {
+
+  const handleChange = (event: React.ChangeEvent<HTMLSelectElement>) => setValue(event.target.value)
+
+  return (
+    <div className={styles.dropdown}>
+      <select name={name} value={value} onChange={handleChange}>
+        <option value="">{defaultLabel}</option>
+        {options.map(option => <option key={option} value={option}>{option}</option>)}
+      </select>
+      <span className="focus"></span>
+    </div>
+  );
+}
+
+export default Dropdown;