adding tests (#5491)

tests/Get-DbaDbTable.Tests.ps1

@@ -5,15 +5,36 @@ Write-Host -Object "Running $PSCommandPath" -ForegroundColor Cyan
 Describe "$CommandName Unit Tests" -Tag 'UnitTests' {
     Context "Validate parameters" {
         [object[]]$params = (Get-Command $CommandName).Parameters.Keys | Where-Object {$_ -notin ('whatif', 'confirm')}
-        [object[]]$knownParameters = 'SqlInstance','SqlCredential','Database','ExcludeDatabase','IncludeSystemDBs','Table','EnableException'
+        [object[]]$knownParameters = 'SqlInstance', 'SqlCredential', 'Database', 'ExcludeDatabase', 'IncludeSystemDBs', 'Table', 'EnableException'
         $knownParameters += [System.Management.Automation.PSCmdlet]::CommonParameters
         It "Should only contain our specific parameters" {
             (@(Compare-Object -ReferenceObject ($knownParameters | Where-Object {$_}) -DifferenceObject $params).Count ) | Should Be 0
         }
     }
 }
-<#
-    Integration test should appear below and are custom to the command you are writing.
-    Read https://github.com/sqlcollaborative/dbatools/blob/development/contributing.md#tests
-    for more guidence.
-#>
+
+Describe "$CommandName Integration Tests" -Tag "IntegrationTests" {
+    BeforeAll {
+        $dbname = "dbatoolsscidb_$(Get-Random)"
+        $null = New-DbaDatabase -SqlInstance $script:instance1 -Name $dbname -Owner sa
+        $tablename = "dbatoolssci_$(Get-Random)"
+        $null = Invoke-DbaQuery -SqlInstance $script:instance1 -Database $dbname -Query "Create table $tablename (col1 int)"
+    }
+    AfterAll {
+        $null = Invoke-DbaQuery -SqlInstance $script:instance1 -Database $dbname -Query "drop table $tablename"
+        $null = Remove-DbaDatabase -SqlInstance $script:instance1 -Database $dbname -Confirm:$false
+    }
+    Context "Should get the table" {
+        It "Gets the table" {
+            (Get-DbaDbTable -SqlInstance $script:instance1).Name | Should Contain $tablename
+        }
+        It "Gets the table when you specify the database" {
+            (Get-DbaDbTable -SqlInstance $script:instance1 -Database $dbname).Name | Should Contain $tablename
+        }
+    }
+    Context "Should not get the table if database is excluded" {
+        It "Doesn't find the table" {
+            (Get-DbaDbTable -SqlInstance $script:instance1 -ExcludeDatabase $dbname).Name | Should Not Contain $tablename
+        }
+    }
+}