feat(ENG-693): add OakAccordion

src/components/molecules/OakAccordion/OakAccordion.stories.tsx

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+import React from "react";
+import { Meta, StoryObj } from "@storybook/react";
+
+import { OakCheckBox } from "../OakCheckBox";
+
+import { OakAccordion } from "./OakAccordion";
+
+const meta: Meta<typeof OakAccordion> = {
+  component: OakAccordion,
+  tags: ["autodocs"],
+  title: "components/molecules/OakAccordion",
+  parameters: {
+    controls: {
+      include: ["header", "headerAfterSlot", "children"],
+    },
+  },
+  argTypes: {
+    children: {
+      control: {
+        type: "text",
+      },
+    },
+    headerAfterSlot: {
+      control: {
+        type: "text",
+      },
+    },
+    header: {
+      control: {
+        type: "text",
+      },
+    },
+  },
+  args: {
+    id: "accordion-1",
+    header: "Embedded content",
+    children:
+      "Any cookies required for video or other embedded learning content to work",
+  },
+  render: (args) => <OakAccordion {...args} />,
+};
+export default meta;
+
+type Story = StoryObj<typeof OakAccordion>;
+
+export const Default: Story = {};
+
+export const WithHeaderAfterSlot: Story = {
+  args: {
+    headerAfterSlot: (
+      <OakCheckBox id="check-me" value="check-me" displayValue="" />
+    ),
+  },
+};
+
+export const MultipleAccordions: Story = {
+  parameters: {
+    controls: {
+      include: [],
+    },
+  },
+  render: () => {
+    return (
+      <>
+        <OakAccordion
+          id="necessary-accordion"
+          header="Strictly necessary"
+          headerAfterSlot={
+            <OakCheckBox
+              id="necessary"
+              value="necessary"
+              displayValue=""
+              checked
+              disabled
+            />
+          }
+        >
+          Necessary for the website to function
+        </OakAccordion>
+        <OakAccordion
+          id="embedded-accordion"
+          header="Embedded content"
+          headerAfterSlot={
+            <OakCheckBox
+              id="embedded"
+              value="embedded"
+              displayValue=""
+              checked={false}
+            />
+          }
+        >
+          Any cookies required for video or other embedded learning content to
+          work
+        </OakAccordion>
+        <OakAccordion
+          id="statistics-accordion"
+          header="Statistics"
+          headerAfterSlot={
+            <OakCheckBox
+              id="statistics"
+              value="statistics"
+              displayValue=""
+              checked
+            />
+          }
+        >
+          Any cookies that may be used to track website usage
+        </OakAccordion>
+      </>
+    );
+  },
+};

src/components/molecules/OakAccordion/OakAccordion.test.tsx

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+import React from "react";
+import { create } from "react-test-renderer";
+import { act, fireEvent } from "@testing-library/react";
+import "@testing-library/jest-dom";
+
+import { OakAccordion } from "./OakAccordion";
+
+import { OakThemeProvider } from "@/components/atoms";
+import { oakDefaultTheme } from "@/styles";
+import renderWithTheme from "@/test-helpers/renderWithTheme";
+
+describe(OakAccordion, () => {
+  it("matches snapshot", () => {
+    const tree = create(
+      <OakThemeProvider theme={oakDefaultTheme}>
+        <OakAccordion
+          initialOpen
+          header="See more"
+          headerAfterSlot="After"
+          id="see-more"
+        >
+          Here it is
+        </OakAccordion>
+      </OakThemeProvider>,
+    ).toJSON();
+
+    expect(tree).toMatchSnapshot();
+  });
+
+  it("toggles open and closed", () => {
+    const { queryByRole, queryByText, getByText } = renderWithTheme(
+      <OakAccordion header="See more" id="see-more">
+        Here it is
+      </OakAccordion>,
+    );
+
+    expect(queryByRole("region")).not.toBeInTheDocument();
+
+    act(() => {
+      fireEvent.click(getByText("See more"));
+    });
+
+    expect(queryByRole("region")).toBeVisible();
+    expect(queryByText("Here it is")).toBeInTheDocument();
+
+    act(() => {
+      fireEvent.click(getByText("See more"));
+    });
+
+    expect(queryByRole("region")).not.toBeInTheDocument();
+  });
+});

src/components/molecules/OakAccordion/OakAccordion.tsx

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+import React, { ReactNode, useState } from "react";
+import styled from "styled-components";
+
+import { OakBox, OakFlex, OakIcon } from "@/components/atoms";
+import { parseSpacing } from "@/styles/helpers/parseSpacing";
+import { parseDropShadow } from "@/styles/helpers/parseDropShadow";
+
+export type OakAccordionProps = {
+  /**
+   * The header of the accordion
+   */
+  header: ReactNode;
+  /**
+   * Slot to place content after the header and outside the button
+   */
+  headerAfterSlot?: ReactNode;
+  /**
+   * Whether the accordion should be open initially
+   */
+  initialOpen?: boolean;
+  /**
+   * The content of the accordion
+   */
+  children: ReactNode;
+  /**
+   * The id of the accordion
+   */
+  id: string;
+};
+
+const StyledOakFlex = styled(OakFlex)`
+  font: inherit;
+  border: none;
+  background: none;
+  appearance: none;
+  margin: -${parseSpacing("inner-padding-m")};
+
+  outline: none;
+
+  &:focus-visible {
+    box-shadow: ${parseDropShadow("drop-shadow-centered-lemon")},
+      ${parseDropShadow("drop-shadow-centered-grey")};
+  }
+`;
+
+/**
+ * An accordion component that can be used to show/hide content
+ */
+export const OakAccordion = ({
+  header,
+  headerAfterSlot,
+  children,
+  initialOpen = false,
+  id,
+}: OakAccordionProps) => {
+  const [isOpen, setOpen] = useState(initialOpen);
+
+  return (
+    <OakBox
+      $borderColor="border-neutral-lighter"
+      $ba="border-solid-s"
+      $pa="inner-padding-m"
+      $background={isOpen ? "bg-neutral" : "bg-primary"}
+    >
+      <OakFlex
+        as="h3"
+        $font="heading-light-7"
+        $textDecoration={isOpen ? "underline" : "none"}
+      >
+        <StyledOakFlex
+          as="button"
+          onClick={() => setOpen(!isOpen)}
+          $alignItems="center"
+          $pa="inner-padding-m"
+          $flexGrow={1}
+          aria-expanded={isOpen}
+          id={id}
+        >
+          <OakIcon
+            iconName="chevron-down"
+            $mr="space-between-s"
+            $width="all-spacing-6"
+            $height="all-spacing-6"
+            alt=""
+            style={{ transform: isOpen ? "rotate(180deg)" : "none" }}
+          />
+          {header}
+        </StyledOakFlex>
+        {headerAfterSlot && (
+          <OakFlex $ml="space-between-m">{headerAfterSlot}</OakFlex>
+        )}
+      </OakFlex>
+      <OakBox
+        $ml="space-between-m"
+        $pl="inner-padding-m"
+        $mt="space-between-sssx"
+        $font="body-3"
+        hidden={!isOpen}
+        aria-labelledby={id}
+        role="region"
+      >
+        {children}
+      </OakBox>
+    </OakBox>
+  );
+};