added test coverage for unit

Author: del02433

app/code/Magento/Catalog/Model/Indexer/Category/Product/TableMaintainer.php

@@ -229,7 +229,7 @@ public function createMainTmpTable(int $storeId)
     public function getMainTmpTable(int $storeId)
     {
         if (!isset($this->mainTmpTable[$storeId])) {
-            throw new \Magento\Framework\Exception\NoSuchEntityException('Temporary table does not exist');
+            throw new \Magento\Framework\Exception\NoSuchEntityException(__('Temporary table does not exist'));
         }
         return $this->mainTmpTable[$storeId];
     }

app/code/Magento/Catalog/Test/Unit/Model/Indexer/Category/Product/TableMaintainerTest.php

@@ -0,0 +1,98 @@
+<?php
+/**
+ * Copyright 2025 Adobe
+ * All Rights Reserved.
+ */
+
+declare(strict_types=1);
+
+namespace Magento\Catalog\Test\Unit\Model\Indexer\Category\Product;
+
+use Magento\Catalog\Model\Indexer\Category\Product\AbstractAction;
+use Magento\Catalog\Model\Indexer\Category\Product\TableMaintainer;
+use Magento\Framework\App\ResourceConnection;
+use Magento\Framework\DB\Adapter\AdapterInterface;
+use Magento\Framework\DB\Ddl\Table as DdlTable;
+use Magento\Framework\Indexer\ScopeResolver\IndexScopeResolver as TableResolver;
+use Magento\Framework\Search\Request\Dimension;
+use PHPUnit\Framework\MockObject\MockObject;
+use PHPUnit\Framework\TestCase;
+
+class TableMaintainerTest extends TestCase
+{
+    /** @var ResourceConnection|MockObject */
+    private $resource;
+
+    /** @var TableResolver|MockObject */
+    private $tableResolver;
+
+    /** @var AdapterInterface|MockObject */
+    private $adapter;
+
+    /** @var TableMaintainer */
+    private $maintainer;
+
+    protected function setUp(): void
+    {
+        $this->resource = $this->createMock(ResourceConnection::class);
+        $this->tableResolver = $this->createMock(TableResolver::class);
+        $this->adapter = $this->createMock(AdapterInterface::class);
+
+        $this->resource->method('getConnection')->willReturn($this->adapter);
+        $this->resource->method('getTableName')->willReturnCallback(
+            static function (string $name) {
+                return 'pref_' . $name;
+            }
+        );
+
+        $this->maintainer = new TableMaintainer($this->resource, $this->tableResolver);
+    }
+
+    public function testGetMainTableAndReplicaTableName(): void
+    {
+        $storeId = 3;
+        $resolvedMain = 'catalog_category_product_index_store3';
+
+        $this->tableResolver->expects($this->atLeastOnce())
+            ->method('resolve')
+            ->with(AbstractAction::MAIN_INDEX_TABLE, $this->callback(function (array $dims): bool {
+                return isset($dims[0]) && $dims[0] instanceof Dimension;
+            }))
+            ->willReturn($resolvedMain);
+
+        $this->assertSame($resolvedMain, $this->maintainer->getMainTable($storeId));
+        $this->assertSame($resolvedMain . '_replica', $this->maintainer->getMainReplicaTable($storeId));
+    }
+
+    public function testCreateMainTmpTableAndGetMainTmpTable(): void
+    {
+        $storeId = 7;
+        $resolvedMain = 'index_7';
+        $tmpName = $resolvedMain . '_tmp';
+
+        $this->tableResolver->expects($this->any())
+            ->method('resolve')
+            ->willReturn($resolvedMain);
+
+        $this->adapter->expects($this->once())
+            ->method('createTemporaryTableLike')
+            ->with($tmpName, $resolvedMain, true);
+
+        // First call creates and caches temp table
+        $this->maintainer->createMainTmpTable($storeId);
+        // Second call should be a no-op (still once)
+        $this->maintainer->createMainTmpTable($storeId);
+
+        self::assertSame($tmpName, $this->maintainer->getMainTmpTable($storeId));
+
+        $this->expectException(\Magento\Framework\Exception\NoSuchEntityException::class);
+        // Different store id should not have tmp table created
+        $this->maintainer->getMainTmpTable($storeId + 1);
+    }
+
+    public function testGetSameAdapterConnectionReturnsSameInstance(): void
+    {
+        $same = $this->maintainer->getSameAdapterConnection();
+        $this->assertSame($this->adapter, $same);
+    }
+}