feat(ByRole): Allow filter by aria-current state (testing-library#943)

Co-authored-by: eps1lon <silbermann.sebastian@gmail.com>

src/__tests__/ariaAttributes.js

@@ -177,6 +177,31 @@ test('`pressed: true|false` matches `pressed` elements with proper role', () =>
   expect(getByRole('button', {pressed: false})).toBeInTheDocument()
 })
 
+test.each([
+  ['true', true],
+  ['false', false],
+  ['date', 'date'],
+  ['location', 'location'],
+  ['page', 'page'],
+  ['step', 'step'],
+  ['time', 'time'],
+])(
+  '`aria-current="%s"` matches `current: %j` elements with proper role',
+  (ariaCurrentValue, filterByValue) => {
+    const {getByRole} = renderIntoDocument(
+      ` <a href="/" aria-current="${ariaCurrentValue}"></a>`,
+    )
+    expect(getByRole('link', {current: filterByValue})).toBeInTheDocument()
+  },
+)
+
+test('Missing `aria-current` matches `current: false`', () => {
+  const {getByRole} = renderIntoDocument(
+    `<a aria-current="true" href="/">Start</a><a href="/about">About</a>`,
+  )
+  expect(getByRole('link', {current: false})).toBeInTheDocument()
+})
+
 test('`level` matches elements with `heading` role', () => {
   const {getAllByRole, queryByRole} = renderIntoDocument(
     `<div>

src/queries/role.js

@@ -4,6 +4,7 @@ import {
   computeAriaSelected,
   computeAriaChecked,
   computeAriaPressed,
+  computeAriaCurrent,
   computeAriaExpanded,
   computeHeadingLevel,
   getImplicitAriaRoles,
@@ -35,6 +36,7 @@ function queryAllByRole(
     selected,
     checked,
     pressed,
+    current,
     level,
     expanded,
   } = {},
@@ -64,6 +66,16 @@ function queryAllByRole(
     }
   }
 
+  if (current !== undefined) {
+    /* istanbul ignore next */
+    // guard against unknown roles
+    // All currently released ARIA versions support `aria-current` on all roles.
+    // Leaving this for symetry and forward compatibility
+    if (allRoles.get(role)?.props['aria-current'] === undefined) {
+      throw new Error(`"aria-current" is not supported on role "${role}".`)
+    }
+  }
+
   if (level !== undefined) {
     // guard against using `level` option with any role other than `heading`
     if (role !== 'heading') {
@@ -124,6 +136,9 @@ function queryAllByRole(
       if (pressed !== undefined) {
         return pressed === computeAriaPressed(element)
       }
+      if (current !== undefined) {
+        return current === computeAriaCurrent(element)
+      }
       if (expanded !== undefined) {
         return expanded === computeAriaExpanded(element)
       }

src/role-helpers.js

@@ -247,6 +247,19 @@ function computeAriaPressed(element) {
   return checkBooleanAttribute(element, 'aria-pressed')
 }
 
+/**
+ * @param {Element} element -
+ * @returns {boolean | string | null} -
+ */
+function computeAriaCurrent(element) {
+  // https://www.w3.org/TR/wai-aria-1.1/#aria-current
+  return (
+    checkBooleanAttribute(element, 'aria-current') ??
+    element.getAttribute('aria-current') ??
+    false
+  )
+}
+
 /**
  * @param {Element} element -
  * @returns {boolean | undefined} - false/true if (not)expanded, undefined if not expand-able
@@ -301,6 +314,7 @@ export {
   computeAriaSelected,
   computeAriaChecked,
   computeAriaPressed,
+  computeAriaCurrent,
   computeAriaExpanded,
   computeHeadingLevel,
 }

types/queries.d.ts

@@ -88,6 +88,10 @@ export interface ByRoleOptions extends MatcherOptions {
    * pressed in the accessibility tree, i.e., `aria-pressed="true"`
    */
   pressed?: boolean
+  /**
+   * Filters elements by their `aria-current` state. `true` and `false` match `aria-current="true"` and `aria-current="false"` (as well as a missing `aria-current` attribute) respectively.
+   */
+  current?: boolean | string
   /**
    * If true only includes elements in the query set that are marked as
    * expanded in the accessibility tree, i.e., `aria-expanded="true"`