Add AddressHelper::convertFormulaToA1 tests for SpreadsheetXML

src/PhpSpreadsheet/Cell/AddressHelper.php

@@ -48,7 +48,7 @@ class AddressHelper
     }
 
     /**
-     * Converts a formula that uses R1C1 format cell address to an A1 format cell address.
+     * Converts a formula that uses R1C1/SpreadsheetXML format cell address to an A1 format cell address.
      */
     public static function convertFormulaToA1(
         string $formula,

tests/PhpSpreadsheetTests/Cell/AddressHelperTest.php

@@ -109,4 +109,19 @@ class AddressHelperTest extends TestCase
     {
         return require 'tests/data/Cell/A1ConversionToR1C1Exception.php';
     }
+
+    /**
+     * @dataProvider providerConvertFormulaToA1SpreadsheetXml
+     */
+    public function testConvertFormulaToA1SpreadsheetXml(string $expectedValue, string $formula): void
+    {
+        $actualValue = AddressHelper::convertFormulaToA1($formula);
+
+        self::assertSame($expectedValue, $actualValue);
+    }
+
+    public function providerConvertFormulaToA1SpreadsheetXml(): array
+    {
+        return require 'tests/data/Cell/ConvertFormulaToA1SpreadsheetXml.php';
+    }
 }

tests/data/Cell/ConvertFormulaToA1SpreadsheetXml.php

@@ -0,0 +1,7 @@
+<?php
+
+return [
+    ['=B4+C4', 'of:=[.B4]+[.C4]'],
+    ['=SUM(B1:B4)', 'of:=SUM([.B1:.B4])'],
+    ['=CONCAT("Result of formula expression =[.B4]+[.C4] is: ", B4+C4)', 'of:=CONCAT("Result of formula expression =[.B4]+[.C4] is: ", [.B4]+[.C4])'],
+];