Merge pull request #711 from uSlackr/patch-2

Adding test for Get-ColumnName for https://github.com/dfinke/ImportExcel/issues/708

__tests__/Get-ExcelColumnName.Test.ps1

@@ -0,0 +1,32 @@
+#Requires -Modules Pester
+#Import-Module $PSScriptRoot\..\ImportExcel.psd1 -Force
+
+$map = @{
+    1024  = 'AMJ'
+    2048  = 'BZT'
+    3072  = 'DND'
+    4096  = 'FAN'
+    5120  = 'GNX'
+    6144  = 'IBH'
+    7168  = 'JOR'
+    8192  = 'LCB'
+    9216  = 'MPL'
+    10240 = 'OCV'
+    11264 = 'PQF'
+    12288 = 'RDP'
+    13312 = 'SQZ'
+    14336 = 'UEJ'
+    15360 = 'VRT'
+    16384 = 'XFD'
+}
+
+(Get-ExcelColumnName 26).columnName     |Should be 'Z'
+(Get-ExcelColumnName 27).columnName     |Should be 'AA'
+(Get-ExcelColumnName 28).columnNamee    |Should be 'AB'
+(Get-ExcelColumnName 30).columnName     |Should be 'AD'
+(Get-ExcelColumnName 48).columnName     |Should be 'AV'
+
+1..16 | % {
+    $number = $_*1024    
+    (Get-ExcelColumnName $number).columnName |Should be $map.$number
+}