MC-42215: Some item cannot be saved - Make sure the To Date is later than or the same as the From Date

- added test

Author: o-dubovyk

dev/tests/integration/testsuite/Magento/Catalog/Model/Attribute/Backend/StartdateTest.php

@@ -61,6 +61,9 @@ public function testBeforeSave(): void
     }
 
     /**
+     * Test that Product with attribute "Set Product as New"
+     * with starting date and with expired ending date throws Exception.
+     *
      * @return void
      */
     public function testValidate(): void
@@ -72,4 +75,19 @@ public function testValidate(): void
         $this->expectExceptionMessage((string)$msg);
         $this->startDate->validate($product);
     }
+
+    /**
+     * Test that Product with attribute "Set Product as New"
+     * without starting date and with expired ending date doesn't throw Exception.
+     *
+     * @return void
+     */
+    public function testValidatePastEndWithNoStart(): void
+    {
+        $product = $this->productFactory->create();
+        $actualResult = $this->startDate->validate($product);
+        $this->assertEquals(true, $actualResult);
+        $noException = $this->getExpectedExceptionMessage();
+        $this->assertNull($noException);
+    }
 }