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+# MFTF 3.0.0 backward incompatible changes
+
+This page highlights backward incompatible changes between releases that have a major impact and require detailed explanation and special instructions to ensure third-party tests continue working with Magento core tests.
+
+## Minimum supported PHP version changes
+
+We changed the minimum PHP version requirement from 7.0 to 7.3. Because of the PHP version requirement change, this MFTF version only supports Magento 2.4 or later.
+
+## Folder structure changes
+
+We removed support to read test modules from the deprecated path `dev/tests/acceptance/tests/functional/Magento/FunctionalTest`. If there are test modules in this path, they should be moved to `dev/tests/acceptance/tests/functional/Magento`. 
+
+## XSD schema changes
+
+-  Files under test modules `ActionGroup`, `Page`, `Section`, `Test` and `Suite` only support a single entity per file. 
+-  The `file` attribute from `<module>` has been removed from the suite schema. `<module file=""/>` is no longer supported in suites.
+-  Metadata filename format changed to ***`*Meta.xml`***.
+-  Only nested assertion syntax will be supported. See the [assertions page](./docs/test/assertions.md) for details. Here is an example of the nested assertion syntax:
+   ```xml
+   <assertEquals stepKey="assertAddressOrderPage">
+      <actualResult type="const">$billingAddressOrderPage</actualResult>
+      <expectedResult type="const">$shippingAddressOrderPage</expectedResult>
+   </assertEquals>
+   ```
+
+### Upgrading tests to the new schema
+
+The following table lists the upgrade scripts that are available to upgrade tests to the new schema.
+
+| Script name           | Description                                                                                               |
+|-----------------------|-----------------------------------------------------------------------------------------------------------|
+|`splitMultipleEntitiesFiles`| Splits files that have multiple entities into multiple files with one entity per file. |
+|`upgradeAssertionSchema`| Updates assert actions that uses the old assertion syntax into the new nested syntax.|
+|`renameMetadataFiles`| Renames Metadata filenames to `*Meta.xml`.|
+|`removeModuleFileInSuiteFiles`| Removes occurrences of `<module file=""/>` from all `<suite>`s.|
+|`removeUnusedArguments`| Removes unused arguments from action groups.|
+|`upgradeTestSchema`| Replaces relative schema paths to URN in test files.| 
+
+To run the upgrade tests:
+
+1. Run `bin/mftf reset --hard` to remove old generated configurations.
+1. Run `bin/mftf build:project` to generate new configurations.
+1. Run `bin/mftf upgrade:tests`. [See command page for details](./docs/commands/mftf.md#upgradetests).
+1. Lastly, try to generate all tests. Tests should all be generated as a result of the upgrades. If not, the most likely issue will be a changed XML schema. Check error messaging and search your codebase for the attributes listed.
+
+## MFTF commands
+
+`--debug` option `NONE` removed for strict schema validation. Ensure there are no schema validation errors in test modules before running MFTF commands.
+
+## MFTF actions
+
+### `executeInSelenium` and `performOn` removed
+
+**Action**: Deprecated actions `executeInSelenium` and `performOn` are removed in favor of new action `helper`.
+
+**Reason**: `executeInSelenium` and `performOn` allowed custom PHP code to be written inline inside of XML files which was difficult to maintain, troubleshoot, and modify.
+
+**Details**: 
+
+The `helper` allows test writers to solve advanced requirements beyond what MFTF offers out of the box. See [custom-helpers](./docs/custom-helpers.md) for more information on usage. 
+
+Here is an example of using `helper` in place of `executeSelenium` to achieve same workflow.
+
+Old usage:
+
+```xml
+<executeInSelenium function="function ($webdriver) use ($I) {
+        $heading = $webdriver->findElement(\Facebook\WebDriver\WebDriverBy::xpath('//div[contains(@class, \'inline-wysiwyg\')]//h2'));
+        $actions = new \Facebook\WebDriver\Interactions\WebDriverActions($webdriver);
+        $actions->moveToElement($heading, {{TinyMCEPartialHeadingSelection.startX}}, {{TinyMCEPartialHeadingSelection.startY}})
+         ->clickAndHold()
+         ->moveToElement($heading, {{TinyMCEPartialHeadingSelection.endX}}, {{TinyMCEPartialHeadingSelection.endY}})
+         ->release()
+         ->perform();
+        }" stepKey="selectHeadingTextInTinyMCE"/>
+```    
+
+New usage:
+
+```xml
+<helper class="\Magento\PageBuilder\Test\Mftf\Helper\SelectText" method="selectText" stepKey="selectHeadingTextInTinyMCE">
+    <argument name="context">//div[contains(@class, 'inline-wysiwyg')]//h2</argument>
+    <argument name="startX">{{TinyMCEPartialHeadingSelection.startX}}</argument>
+    <argument name="startY">{{TinyMCEPartialHeadingSelection.startY}}</argument>
+    <argument name="endX">{{TinyMCEPartialHeadingSelection.endX}}</argument>
+    <argument name="endY">{{TinyMCEPartialHeadingSelection.endY}}</argument>
+</helper>
+```
+
+### `pauseExecution` removed
+
+**Action**: `pauseExecution` is removed in favor of `pause`.
+
+**Reason**: `[WebDriver]pauseExecution` is removed in Codeception 3 in favor of `I->pause()`.
+
+**Details**: 
+
+See the [actions page for details](./docs/test/actions.md#pause). Here is a usage example:
+
+```xml
+<pause stepKey="pauseExecutionKey"/>
+```
+
+### Removed assert actions
+
+**Action**: Assert actions `assertInternalType`, `assertNotInternalType` and `assertArraySubset` are removed.
+
+**Reason**: PHPUnit 9 has dropped support for these assertions.
+
+### Updated assert actions
+
+**Action**: The `delta` attribute has been removed from `assertEquals` and `assertNotEquals`. Instead, new assert actions have been introduced:
+
+ -  `assertEqualsWithDelta`
+ -  `assertNotEqualsWithDelta` 
+ -  `assertEqualsCanonicalizing`
+ -  `assertNotEqualsCanonicalizing`
+ -  `assertEqualsIgnoringCase`
+ -  `assertNotEqualsIgnoringCase`
+
+**Reason**: PHPUnit 9 has dropped support for optional parameters for `assertEquals` and `assertNotEquals` and has introduced these new assertions.
+
+**Details**: 
+
+Usage of `assertEquals` or `assertNotEquals` with a specified `delta`, should be replaced with appropriate assertion from the above list.
+
+### `assertContains` supports only iterable haystacks
+
+**Action**: `assertContains` and `assertNotContains` now only supports iterable haystacks. These assert actions have been added to work with string haystacks:
+
+-  `assertStringContainsString`
+-  `assertStringNotContainsString`
+-  `assertStringContainsStringIgnoringCase`
+-  `assertStringNotContainsStringIgnoringCase`
+
+**Reason**: With PHPUnit 9, `assertContains` and `assertNotContains` only allows iterable haystacks. New assertions have been introduced to support string haystacks.
+
+**Details**: 
+
+Usages of `assertContains` and `assertNotContains` with string haystacks should be replaced with appropriate assertion from the above list.
+
+Usage example for string haystacks:
+
+```xml
+<assertStringContainsString stepKey="assertDiscountOnPrice2">
+  <actualResult type="const">$grabSimpleProdPrice2</actualResult>
+  <expectedResult type="string">$110.70</expectedResult>
+</assertStringContainsString>
+```
+
+### `formatMoney` removed
+
+**Action**: `formatMoney` has been removed in favor of `formatCurrency`.
+
+**Reason**: PHP 7.4 has deprecated use of `formatMoney`. 
+
+**Details**: Format input to specified currency according to the locale specified. 
+
+Usage example:
+
+```xml
+<formatCurrency userInput="1234.56789000" locale="de_DE" currency="USD" stepKey="usdInDE"/>
+```