Renamed test directory

__tests__/ImportExcelTests/Simple.tests.ps1

@@ -0,0 +1,32 @@
+Import-Module $PSScriptRoot\..\..\ImportExcel.psd1
+
+Describe "Tests" {
+    BeforeAll {
+        $data = $null
+        $timer = Measure-Command {
+            $data = Import-Excel $PSScriptRoot\Simple.xlsx
+        }
+    }
+
+    It "Should have two items" {
+        $data.count | Should be 2
+    }
+
+    It "Should have items a and b" {
+        $data[0].p1 | Should be "a"
+        $data[1].p1 | Should be "b"
+    }
+
+    It "Should read fast < 1000 milliseconds" {
+        $timer.TotalMilliseconds | should BeLessThan 1000
+    }
+
+    It "Should read larger xlsx, 4k rows 1 col < 1500 milliseconds" {
+        $timer = Measure-Command {
+            $null = Import-Excel $PSScriptRoot\LargerFile.xlsx
+        }
+
+        $timer.TotalMilliseconds | should BeLessThan 1500
+    }
+
+}