Text function array value tests, plus some cleanup

Author: MarkBaker

CHANGELOG.md

@@ -49,6 +49,7 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
+- Fix bug with `DOLLARDE()` and `DOLLARFR()` functions when the dollar value is negative [Issue #2578](https://github.com/PHPOffice/PhpSpreadsheet/issues/2578) [PR #]()
 - Fix partial function name matching when translating formulae from Russian to English [Issue #2533](https://github.com/PHPOffice/PhpSpreadsheet/issues/2533) [PR #2534](https://github.com/PHPOffice/PhpSpreadsheet/pull/2534)
 - Various bugs related to Conditional Formatting Rules, and errors in the Xlsx Writer for Conditional Formatting [PR #2491](https://github.com/PHPOffice/PhpSpreadsheet/pull/2491)
 - Xlsx Reader merge range fixes.

src/PhpSpreadsheet/Calculation/Financial/Dollar.php

@@ -51,7 +51,7 @@ public static function decimal($fractionalDollar = null, $fraction = 0)
             return Functions::DIV0();
         }
 
-        $dollars = floor($fractionalDollar);
+        $dollars = ($fractionalDollar < 0.0) ? ceil($fractionalDollar) : floor($fractionalDollar);
         $cents = fmod($fractionalDollar, 1);
         $cents /= $fraction;
         $cents *= 10 ** ceil(log10($fraction));
@@ -87,7 +87,7 @@ public static function fractional($decimalDollar = null, $fraction = 0)
             return Functions::DIV0();
         }
 
-        $dollars = floor($decimalDollar);
+        $dollars = ($decimalDollar < 0.0) ? ceil($decimalDollar) : floor($decimalDollar);
         $cents = fmod($decimalDollar, 1);
         $cents *= $fraction;
         $cents *= 10 ** (-ceil(log10($fraction)));

tests/data/Calculation/Financial/DOLLARDE.php

@@ -3,6 +3,16 @@
 // fractional_dollar, fraction, result
 
 return [
+    [
+        2.5,
+        1.6,
+        4,
+    ],
+    [
+        -2.5,
+        -1.6,
+        4,
+    ],
     [
         1.125,
         1.02,

tests/data/Calculation/Financial/DOLLARFR.php

@@ -3,6 +3,16 @@
 // decimal_dollar, fraction, result
 
 return [
+    [
+        1.24,
+        1.6,
+        4,
+    ],
+    [
+        -1.24,
+        -1.6,
+        4,
+    ],
     [
         1.02,
         1.125,