Add checkout_cart_product_add_before event #17830

Author: leandro-rosa

app/code/Magento/Checkout/Model/Cart.php

@@ -370,6 +370,10 @@ public function addProduct($productInfo, $requestInfo = null)
 
         if ($productId) {
             try {
+                $this->_eventManager->dispatch(
+                    'checkout_cart_product_add_before',
+                    ['info' => $requestInfo, 'product' => $product]
+                );
                 $result = $this->getQuote()->addProduct($product, $request);
             } catch (\Magento\Framework\Exception\LocalizedException $e) {
                 $this->_checkoutSession->setUseNotice(false);

app/code/Magento/Checkout/Test/Unit/Model/CartTest.php

@@ -315,14 +315,20 @@ public function testAddProduct($productInfo, $requestInfo)
         $this->productRepository->expects($this->any())
             ->method('getById')
             ->will($this->returnValue($product));
+
+        $this->eventManagerMock->expects($this->at(0))->method('dispatch')->with(
+            'checkout_cart_product_add_before',
+            ['info' => $requestInfo, 'product' => $product]
+        );
+
         $this->quoteMock->expects($this->once())
         ->method('addProduct')
         ->will($this->returnValue(1));
         $this->checkoutSessionMock->expects($this->once())
             ->method('getQuote')
             ->will($this->returnValue($this->quoteMock));
 
-        $this->eventManagerMock->expects($this->at(0))->method('dispatch')->with(
+        $this->eventManagerMock->expects($this->at(1))->method('dispatch')->with(
             'checkout_cart_product_add_after',
             ['quote_item' => 1, 'product' => $product]
         );
@@ -360,6 +366,12 @@ public function testAddProductException()
         $this->productRepository->expects($this->any())
             ->method('getById')
             ->will($this->returnValue($product));
+
+        $this->eventManagerMock->expects($this->at(0))->method('dispatch')->with(
+            'checkout_cart_product_add_before',
+            ['info' => 4, 'product' => $product]
+        );
+
         $this->quoteMock->expects($this->once())
             ->method('addProduct')
             ->will($this->returnValue('error'));
@@ -396,6 +408,11 @@ public function testAddProductExceptionBadParams()
             ->method('getById')
             ->will($this->returnValue($product));
 
+        $this->eventManagerMock->expects($this->never())->method('dispatch')->with(
+            'checkout_cart_product_add_before',
+            ['info' => 'bad', 'product' => $product]
+        );
+
         $this->eventManagerMock->expects($this->never())->method('dispatch')->with(
             'checkout_cart_product_add_after',
             ['quote_item' => 1, 'product' => $product]