Update testdriver to support computedrole/computedlabel (#38758)

Closes web-platform-tests/interop-accessibility#5 Includes basic explicit and implcit role/label tests each for accname (in /accname) and aria role computation (in /aria/role)
web-platform-tests · Mar 6, 2023 · 790bb1a · 790bb1a
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diff --git a/accname/basic.html b/accname/basic.html
@@ -0,0 +1,22 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+
+<div id='d' style='height: 100px; width: 100px' role="group" aria-label="test label"></div>
+<h1 id="h">test heading</h1>
+<script>
+
+promise_test(async t => {
+  const label = await test_driver.get_computed_label(document.getElementById('d'));
+  assert_true(label == "test label");
+}, "tests labelFrom: author");
+
+promise_test(async t => {
+  const label = await test_driver.get_computed_label(document.getElementById('h'));
+  assert_true(label == "test heading");
+}, "tests labelFrom: contents");
+
+</script>
diff --git a/docs/writing-tests/testdriver.md b/docs/writing-tests/testdriver.md
@@ -87,6 +87,13 @@ the global scope.
 
 ```
 
+### Accessibility ###
+```eval_rst
+.. js:autofunction:: test_driver.get_computed_label
+.. js:autofunction:: test_driver.get_computed_role
+
+```
+
 ### Seure Payment Confirmation ###
 ```eval_rst
 .. js:autofunction:: test_driver.set_spc_transaction_mode

diff --git a/resources/testdriver.js b/resources/testdriver.js
@@ -220,6 +220,40 @@
             return cookie;
         },
 
+        /**
+         * Get Computed Label for an element.
+         *
+         * This matches the behaviour of the
+         * `Get Computed Label
+         * <https://w3c.github.io/webdriver/#dfn-get-computed-label>`_
+         * WebDriver command.
+         *
+         * @param {Element} element
+         * @returns {Promise} fulfilled after the computed label is returned, or
+         *                    rejected in the cases the WebDriver command errors
+         */
+        get_computed_label: async function(element) {
+            let label = await window.test_driver_internal.get_computed_label(element);
+            return label;
+        },
+
+        /**
+         * Get Computed Role for an element.
+         *
+         * This matches the behaviour of the
+         * `Get Computed Label
+         * <https://w3c.github.io/webdriver/#dfn-get-computed-role>`_
+         * WebDriver command.
+         *
+         * @param {Element} element
+         * @returns {Promise} fulfilled after the computed role is returned, or
+         *                    rejected in the cases the WebDriver command errors
+         */
+        get_computed_role: async function(element) {
+            let role = await window.test_driver_internal.get_computed_role(element);
+            return role;
+        },
+
         /**
          * Send keys to an element.
          *

diff --git a/tools/webdriver/webdriver/client.py b/tools/webdriver/webdriver/client.py
@@ -893,6 +893,14 @@ def shadow_root(self):
     def attribute(self, name):
         return self.send_element_command("GET", "attribute/%s" % name)
 
+    @command
+    def get_computed_label(self):
+        return self.send_element_command("GET", "computedlabel")
+
+    @command
+    def get_computed_role(self):
+        return self.send_element_command("GET", "computedrole")
+
     # This MUST come last because otherwise @property decorators above
     # will be overridden by this.
     @command

diff --git a/tools/wptrunner/wptrunner/executors/actions.py b/tools/wptrunner/wptrunner/executors/actions.py
@@ -38,6 +38,34 @@ def __call__(self, payload):
         return self.protocol.cookies.get_all_cookies()
 
 
+class GetComputedLabelAction:
+    name = "get_computed_label"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        selector = payload["selector"]
+        element = self.protocol.select.element_by_selector(selector)
+        self.logger.debug("Getting computed label for element: %s" % element)
+        return self.protocol.accessibility.get_computed_label(element)
+
+
+class GetComputedRoleAction:
+    name = "get_computed_role"
+
+    def __init__(self, logger, protocol):
+        self.logger = logger
+        self.protocol = protocol
+
+    def __call__(self, payload):
+        selector = payload["selector"]
+        element = self.protocol.select.element_by_selector(selector)
+        self.logger.debug("Getting computed role for element: %s" % element)
+        return self.protocol.accessibility.get_computed_role(element)
+
+
 class GetNamedCookieAction:
     name = "get_named_cookie"
 
@@ -253,6 +281,8 @@ def __call__(self, payload):
            DeleteAllCookiesAction,
            GetAllCookiesAction,
            GetNamedCookieAction,
+           GetComputedLabelAction,
+           GetComputedRoleAction,
            SendKeysAction,
            MinimizeWindowAction,
            SetWindowRectAction,

diff --git a/tools/wptrunner/wptrunner/executors/executorwebdriver.py b/tools/wptrunner/wptrunner/executors/executorwebdriver.py
@@ -20,6 +20,7 @@
                        TestharnessProtocolPart,
                        Protocol,
                        SelectorProtocolPart,
+                       AccessibilityProtocolPart,
                        ClickProtocolPart,
                        CookiesProtocolPart,
                        SendKeysProtocolPart,
@@ -186,6 +187,17 @@ def elements_by_selector(self, selector):
         return self.webdriver.find.css(selector)
 
 
+class WebDriverAccessibilityProtocolPart(AccessibilityProtocolPart):
+    def setup(self):
+        self.webdriver = self.parent.webdriver
+
+    def get_computed_label(self, element):
+        return element.get_computed_label()
+
+    def get_computed_role(self, element):
+        return element.get_computed_role()
+
+
 class WebDriverClickProtocolPart(ClickProtocolPart):
     def setup(self):
         self.webdriver = self.parent.webdriver
@@ -342,6 +354,7 @@ class WebDriverProtocol(Protocol):
     implements = [WebDriverBaseProtocolPart,
                   WebDriverTestharnessProtocolPart,
                   WebDriverSelectorProtocolPart,
+                  WebDriverAccessibilityProtocolPart,
                   WebDriverClickProtocolPart,
                   WebDriverCookiesProtocolPart,
                   WebDriverSendKeysProtocolPart,

diff --git a/tools/wptrunner/wptrunner/executors/protocol.py b/tools/wptrunner/wptrunner/executors/protocol.py
@@ -299,6 +299,27 @@ def element(self, element):
         pass
 
 
+
+class AccessibilityProtocolPart(ProtocolPart):
+    """Protocol part for accessibility introspection"""
+    __metaclass__ = ABCMeta
+
+    name = "accessibility"
+
+    @abstractmethod
+    def get_computed_label(self, element):
+        """Return the computed accessibility label for a specific element.
+
+        :param element: A protocol-specific handle to an element."""
+        pass
+
+    def get_computed_role(self, element):
+        """Return the computed accessibility role for a specific element.
+
+        :param element: A protocol-specific handle to an element."""
+        pass
+
+
 class CookiesProtocolPart(ProtocolPart):
     """Protocol part for managing cookies"""
     __metaclass__ = ABCMeta

diff --git a/tools/wptrunner/wptrunner/testdriver-extra.js b/tools/wptrunner/wptrunner/testdriver-extra.js
@@ -180,6 +180,18 @@
         return create_action("get_all_cookies", {context});
     };
 
+    window.test_driver_internal.get_computed_label = function(element) {
+        const selector = get_selector(element);
+        const context = get_context(element);
+        return create_action("get_computed_label", {selector, context});
+    };
+
+    window.test_driver_internal.get_computed_role = function(element) {
+        const selector = get_selector(element);
+        const context = get_context(element);
+        return create_action("get_computed_role", {selector, context});
+    };
+
     window.test_driver_internal.get_named_cookie = function(name, context=null) {
         return create_action("get_named_cookie", {name, context});
     };

diff --git a/wai-aria/role/basic.html b/wai-aria/role/basic.html
@@ -0,0 +1,23 @@
+<!doctype html>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<script src="/resources/testdriver.js"></script>
+<script src="/resources/testdriver-vendor.js"></script>
+<script src="/resources/testdriver-actions.js"></script>
+
+<div id='d' style='height: 100px; width: 100px' role="group" aria-label="test label"></div>
+<h1 id="h">test heading</h1>
+<script>
+
+promise_test(async t => {
+  const role = await test_driver.get_computed_role(document.getElementById('d'));
+  assert_true(role == "group");
+}, "tests explicit role");
+
+
+promise_test(async t => {
+  const role = await test_driver.get_computed_role(document.getElementById('h'));
+  assert_true(role == "heading");
+}, "tests implicit role");
+
+</script>