Improve number formatter pattern example in doc blocks

And prove why the previous one was bad.

src/I18n/Number.php

@@ -128,7 +128,7 @@ class Number
      *
      * - `places` - Minimum number or decimals to use, e.g 0
      * - `precision` - Maximum Number of decimal places to use, e.g. 2
-     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,###.00
+     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,##0.00
      * - `locale` - The locale name to use for formatting the number, e.g. fr_FR
      * - `before` - The string to place before whole numbers, e.g. '['
      * - `after` - The string to place after decimal numbers, e.g. ']'
@@ -204,7 +204,7 @@ class Number
      * - `zero` - The text to use for zero values, can be a string or a number. e.g. 0, 'Free!'
      * - `places` - Number of decimal places to use. e.g. 2
      * - `precision` - Maximum Number of decimal places to use, e.g. 2
-     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,###.00
+     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,##0.00
      * - `useIntlCode` - Whether or not to replace the currency symbol with the international
      *   currency code.
      *
@@ -277,7 +277,7 @@ class Number
      *    numbers representing money or a NumberFormatter constant.
      * - `places` - Number of decimal places to use. e.g. 2
      * - `precision` - Maximum Number of decimal places to use, e.g. 2
-     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,###.00
+     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,##0.00
      * - `useIntlCode` - Whether or not to replace the currency symbol with the international
      *   currency code.
      *

src/View/Helper/NumberHelper.php

@@ -169,7 +169,7 @@ class NumberHelper extends Helper
      * - `zero` - The text to use for zero values, can be a string or a number. e.g. 0, 'Free!'
      * - `places` - Number of decimal places to use. e.g. 2
      * - `precision` - Maximum Number of decimal places to use, e.g. 2
-     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,###.00
+     * - `pattern` - An ICU number pattern to use for formatting the number. e.g #,##0.00
      * - `useIntlCode` - Whether or not to replace the currency symbol with the international
      *   currency code.
      * - `escape` - Whether or not to escape html in resulting string

tests/TestCase/I18n/NumberTest.php

@@ -261,6 +261,14 @@ class NumberTest extends TestCase
         $expected = '£0.00';
         $this->assertEquals($expected, $result);
 
+        $result = $this->Number->currency(0, 'GBP', ['pattern' => '¤#,###.00;¤-#,###.00']);
+        $expected = '£.00';
+        $this->assertEquals($expected, $result);
+
+        $result = $this->Number->currency(0, 'GBP', ['pattern' => '¤#,##0.00;¤-#,##0.00']);
+        $expected = '£0.00';
+        $this->assertEquals($expected, $result);
+
         $result = $this->Number->currency(0.00000, 'GBP');
         $expected = '£0.00';
         $this->assertEquals($expected, $result);