Initial Drupal 11 with DDEV setup

web/core/tests/Drupal/Nightwatch/Assertions/deprecationErrorExists.js

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+module.exports.assertion = function (expected) {
+  this.message = `Testing if "${expected}" deprecation error has been triggered`;
+  this.expected = expected;
+  this.pass = (deprecationMessages) => deprecationMessages.includes(expected);
+  this.value = (result) => {
+    const sessionStorageEntries = JSON.parse(result.value);
+    const deprecationMessages =
+      sessionStorageEntries !== null
+        ? sessionStorageEntries.filter((message) =>
+            message.includes('[Deprecation]'),
+          )
+        : [];
+
+    return deprecationMessages.map((message) =>
+      message.replace('[Deprecation] ', ''),
+    );
+  };
+  this.command = (callback) =>
+    // eslint-disable-next-line prefer-arrow-callback
+    this.api.execute(
+      function () {
+        return window.sessionStorage.getItem('js_testing_log_test.warnings');
+      },
+      [],
+      callback,
+    );
+};

web/core/tests/Drupal/Nightwatch/Assertions/elementCount.js

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+module.exports.assertion = function (selector, count) {
+  this.message = `Testing if element <${selector}> has count: ${count}`;
+  this.expected = count;
+  this.pass = function (val) {
+    return val === this.expected;
+  };
+  this.value = function (res) {
+    return res.value;
+  };
+  this.command = function (cb) {
+    const self = this;
+    return this.api.execute(
+      function (selector) {
+        return document.querySelectorAll(selector).length;
+      },
+      [selector],
+      function (res) {
+        cb.call(self, res);
+      },
+    );
+  };
+};

web/core/tests/Drupal/Nightwatch/Assertions/noDeprecationErrors.js

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+module.exports.assertion = function () {
+  this.message = 'Ensuring no deprecation errors have been triggered';
+  this.expected = '';
+  this.pass = (deprecationMessages) => deprecationMessages.length === 0;
+  this.value = (result) => {
+    const sessionStorageEntries = JSON.parse(result.value);
+    const deprecationMessages =
+      sessionStorageEntries !== null
+        ? sessionStorageEntries.filter((message) =>
+            message.includes('[Deprecation]'),
+          )
+        : [];
+
+    return deprecationMessages.map((message) =>
+      message.replace('[Deprecation] ', ''),
+    );
+  };
+  this.command = (callback) =>
+    // eslint-disable-next-line prefer-arrow-callback
+    this.api.execute(
+      function () {
+        return window.sessionStorage.getItem('js_testing_log_test.warnings');
+      },
+      [],
+      callback,
+    );
+};