fix(stepper): make step title keyboard and screen-reader accessible

src/components/Stepper/Step/Step.scss

@@ -29,6 +29,10 @@
   text-decoration: underline;
 }
 
+.step-enabled {
+  @include vf-focus-themed;
+}
+
 .step-disabled {
   color: $colors--theme--text-muted;
   pointer-events: none;

src/components/Stepper/Step/Step.test.tsx

@@ -1,5 +1,5 @@
 import React from "react";
-import { render, screen } from "@testing-library/react";
+import { createEvent, fireEvent, render, screen } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import Step from "./Step";
 import type { Props } from "./Step";
@@ -14,6 +14,10 @@ describe("Step component", () => {
     handleClick: jest.fn(),
   };
 
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
   it("renders the step with the required props", () => {
     render(<Step {...props} />);
     expect(screen.getByText("Title")).toBeInTheDocument();
@@ -47,6 +51,55 @@ describe("Step component", () => {
     expect(props.handleClick).toHaveBeenCalled();
   });
 
+  it("exposes the title as a button role", () => {
+    render(<Step {...props} />);
+    expect(screen.getByRole("button", { name: "Title" })).toBeInTheDocument();
+  });
+
+  it("is keyboard focusable and not aria-disabled when enabled", () => {
+    render(<Step {...props} />);
+    const title = screen.getByText("Title");
+    expect(title).toHaveAttribute("tabindex", "0");
+    expect(title).toHaveAttribute("aria-disabled", "false");
+  });
+
+  it("calls handleClick when Enter is pressed and enabled", async () => {
+    render(<Step {...props} />);
+    screen.getByText("Title").focus();
+    await userEvent.keyboard("{Enter}");
+    expect(props.handleClick).toHaveBeenCalled();
+  });
+
+  it("calls handleClick and prevents default when Space is pressed and enabled", () => {
+    render(<Step {...props} />);
+    const title = screen.getByText("Title");
+    const event = createEvent.keyDown(title, { key: " " });
+    fireEvent(title, event);
+    expect(props.handleClick).toHaveBeenCalled();
+    expect(event.defaultPrevented).toBe(true);
+  });
+
+  it("is not focusable and is aria-disabled when disabled", () => {
+    render(<Step {...props} enabled={false} />);
+    const title = screen.getByText("Title");
+    expect(title).toHaveAttribute("tabindex", "-1");
+    expect(title).toHaveAttribute("aria-disabled", "true");
+  });
+
+  it("does not call handleClick on keyboard activation when disabled", () => {
+    render(<Step {...props} enabled={false} />);
+    const title = screen.getByText("Title");
+    fireEvent.keyDown(title, { key: "Enter" });
+    fireEvent.keyDown(title, { key: " " });
+    expect(props.handleClick).not.toHaveBeenCalled();
+  });
+
+  it("does not call handleClick when clicked while disabled", async () => {
+    render(<Step {...props} enabled={false} />);
+    await userEvent.click(screen.getByText("Title"));
+    expect(props.handleClick).not.toHaveBeenCalled();
+  });
+
   it("can display optional label", () => {
     render(<Step {...props} label="Optional label" />);
 

src/components/Stepper/Step/Step.tsx

@@ -63,6 +63,23 @@ const Step = ({
 }: Props): React.JSX.Element => {
   const stepStatusClass = enabled ? "step-enabled" : "step-disabled";
 
+  const handleKeyDown = (event: React.KeyboardEvent<HTMLSpanElement>) => {
+    if (!enabled) {
+      return;
+    }
+    const isEnter = event.key === "Enter";
+    const isSpace = event.key === " " || event.key === "Spacebar";
+    if (isEnter || isSpace) {
+      if (event.repeat) {
+        return;
+      }
+      if (isSpace) {
+        event.preventDefault();
+      }
+      handleClick();
+    }
+  };
+
   return (
     <div
       className={classNames("step", {
@@ -86,7 +103,14 @@ const Step = ({
         />
       )}
       <div className="step-content">
-        <span className={classNames(stepStatusClass)} onClick={handleClick}>
+        <span
+          className={classNames(stepStatusClass)}
+          onClick={enabled ? handleClick : undefined}
+          onKeyDown={handleKeyDown}
+          role="button"
+          tabIndex={enabled ? 0 : -1}
+          aria-disabled={!enabled}
+        >
           {title}
         </span>
         {label && (

src/components/Stepper/__snapshots__/Stepper.test.tsx.snap

@@ -1,4 +1,4 @@
-// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+// Jest Snapshot v1, https://goo.gl/fbAQLP
 
 exports[`Stepper component renders the stepper 1`] = `
 <ul
@@ -17,7 +17,10 @@ exports[`Stepper component renders the stepper 1`] = `
         class="step-content"
       >
         <span
+          aria-disabled="false"
           class="step-enabled"
+          role="button"
+          tabindex="0"
         >
           Step 1
         </span>
@@ -42,7 +45,10 @@ exports[`Stepper component renders the stepper 1`] = `
         class="step-content"
       >
         <span
+          aria-disabled="false"
           class="step-enabled"
+          role="button"
+          tabindex="0"
         >
           Step 2
         </span>
@@ -69,7 +75,10 @@ exports[`Stepper component renders the stepper 1`] = `
         class="step-content"
       >
         <span
+          aria-disabled="false"
           class="step-enabled"
+          role="button"
+          tabindex="0"
         >
           Step 3
         </span>
@@ -102,7 +111,10 @@ exports[`Stepper component renders the stepper 1`] = `
         class="step-content"
       >
         <span
+          aria-disabled="true"
           class="step-disabled"
+          role="button"
+          tabindex="-1"
         >
           Step 4
         </span>