From a89634ff76b20f08d5c8ea085a3716e2d7120106 Mon Sep 17 00:00:00 2001
From: Arianna Kellogg <ari@truss.works>
Date: Tue, 9 Mar 2021 14:21:58 -0800
Subject: [PATCH] feat!: Update Accordion component default behavior to match
 USWDS (#922)

BREAKING CHANGE: If the multiselectable behavior is desired, the multiselectable prop must now be passed to the Accordion component
---
 .../Accordion/Accordion.stories.tsx           |  4 ++
 src/components/Accordion/Accordion.test.tsx   | 71 +++++++++++++++++++
 src/components/Accordion/Accordion.tsx        | 17 +++--
 3 files changed, 88 insertions(+), 4 deletions(-)

diff --git a/src/components/Accordion/Accordion.stories.tsx b/src/components/Accordion/Accordion.stories.tsx
index a17f4d783a..857dbe1863 100644
--- a/src/components/Accordion/Accordion.stories.tsx
+++ b/src/components/Accordion/Accordion.stories.tsx
@@ -99,6 +99,10 @@ export const bordered = (): React.ReactElement => (
   <Accordion bordered={true} items={testItems} />
 )
 
+export const multiselectable = (): React.ReactElement => (
+  <Accordion items={testItems} multiselectable={true} />
+)
+
 const customTestItems = [
   {
     title: (
diff --git a/src/components/Accordion/Accordion.test.tsx b/src/components/Accordion/Accordion.test.tsx
index 6a7dcc489b..26337984e3 100644
--- a/src/components/Accordion/Accordion.test.tsx
+++ b/src/components/Accordion/Accordion.test.tsx
@@ -151,6 +151,77 @@ describe('Accordion component', () => {
     })
   })
 
+  describe('when multiselectable is false (default behavior)', () => {
+    it('when an item is opened, clicking a different item closes the previously opened item', () => {
+      const { getByText, getByTestId } = render(<Accordion items={testItems} />)
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).not.toBeVisible()
+
+      fireEvent.click(getByText(testItems[3].title))
+      fireEvent.click(getByText(testItems[1].title))
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).not.toBeVisible()
+
+      fireEvent.click(getByText(testItems[4].title))
+      fireEvent.click(getByText(testItems[2].title))
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).not.toBeVisible()
+    })
+  })
+
+  describe('when multiselectable is true', () => {
+    it('when an item is opened, previously open items remain open', () => {
+      const { getByText, getByTestId } = render(
+        <Accordion items={testItems} multiselectable={true} />
+      )
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).not.toBeVisible()
+
+      fireEvent.click(getByText(testItems[0].title))
+      fireEvent.click(getByText(testItems[1].title))
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).not.toBeVisible()
+
+      fireEvent.click(getByText(testItems[0].title))
+      fireEvent.click(getByText(testItems[3].title))
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).not.toBeVisible()
+
+      fireEvent.click(getByText(testItems[2].title))
+      fireEvent.click(getByText(testItems[4].title))
+
+      expect(getByTestId(`accordionItem_${testItems[0].id}`)).not.toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[1].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[2].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[3].id}`)).toBeVisible()
+      expect(getByTestId(`accordionItem_${testItems[4].id}`)).toBeVisible()
+    })
+  })
+
   describe('with expanded items on mount', () => {
     const testExpandedItems = [
       {
diff --git a/src/components/Accordion/Accordion.tsx b/src/components/Accordion/Accordion.tsx
index f65aeecca8..a1a6553730 100644
--- a/src/components/Accordion/Accordion.tsx
+++ b/src/components/Accordion/Accordion.tsx
@@ -12,6 +12,7 @@ interface AccordionItem {
 
 interface AccordionProps {
   bordered?: boolean
+  multiselectable?: boolean
   items: AccordionItem[]
   className?: string
 }
@@ -51,7 +52,7 @@ export const AccordionItem = (props: AccordionItem): React.ReactElement => {
 }
 
 export const Accordion = (props: AccordionProps): React.ReactElement => {
-  const { bordered, items, className } = props
+  const { bordered, items, className, multiselectable = false } = props
 
   const [openItems, setOpenState] = useState(
     items.filter((i) => !!i.expanded).map((i) => i.id)
@@ -68,18 +69,26 @@ export const Accordion = (props: AccordionProps): React.ReactElement => {
   const toggleItem = (itemId: AccordionItem['id']): void => {
     const newOpenItems = [...openItems]
     const itemIndex = openItems.indexOf(itemId)
+    const isMultiselectable = multiselectable
 
     if (itemIndex > -1) {
       newOpenItems.splice(itemIndex, 1)
     } else {
-      newOpenItems.push(itemId)
+      if (isMultiselectable) {
+        newOpenItems.push(itemId)
+      } else {
+        newOpenItems.splice(0, newOpenItems.length)
+        newOpenItems.push(itemId)
+      }
     }
-
     setOpenState(newOpenItems)
   }
 
   return (
-    <div className={classes} data-testid="accordion">
+    <div
+      className={classes}
+      data-testid="accordion"
+      aria-multiselectable={multiselectable || undefined}>
       {items.map((item, i) => (
         <AccordionItem
           key={`accordionItem_${i}`}