Fix phpstan issues that were false-positive

Author: karyna-t

app/code/Magento/Catalog/Test/Unit/Pricing/Price/CustomOptionPriceTest.php

@@ -400,7 +400,7 @@ public function testGetSelectedOptions(): void
 
         // Return from cache
         $result = $this->object->getSelectedOptions();
-        $this->equalTo($optionValue, $result);
+        $this->assertEquals($optionValue, $result);
     }
 
     /**

app/code/Magento/Directory/Setup/Patch/Data/AddDataForIndia.php

@@ -42,7 +42,9 @@ public function __construct(
     }
 
     /**
-     * @inheritdoc
+     * Run code inside patch
+     *
+     * @return void
      */
     public function apply()
     {

app/code/Magento/GroupedProduct/Test/Unit/Model/Product/Type/Grouped/PriceTest.php

@@ -207,6 +207,7 @@ protected function generateAssociatedProducts(): array
         /* price for option taking into account quantity discounts */
         $childProductMock->expects($this->any())->method('getFinalPrice')->with(5)->willReturn(5);
 
+        $associatedProducts = [];
         for ($i = 0; $i <= 2; $i++) {
             $childProduct = clone $childProductMock;
             $childProduct->expects($this->once())->method('getId')->willReturn($i);

lib/internal/Magento/Framework/Mview/Test/Unit/View/SubscriptionTest.php

@@ -124,7 +124,6 @@ protected function setUp(): void
                     ]
                 ]
             ]);
-        $this->mviewConfig = $mviewConfigMock;
         $this->model = new Subscription(
             $this->resourceMock,
             $this->triggerFactoryMock,

setup/src/Magento/Setup/Test/Unit/Model/PhpReadinessCheckTest.php

@@ -467,7 +467,7 @@ protected function isPhp7OrHhvm(): bool
 
 /**
  * @param $param
- * @return int|string
+ * @return int|string|bool
  */
 function ini_get($param)
 {
@@ -478,4 +478,5 @@ function ini_get($param)
     } elseif ($param === 'memory_limit') {
         return '512M';
     }
+    return false;
 }