diff --git a/src/pester-tests/Test-Get-Unique.Tests.ps1 b/src/pester-tests/Test-Get-Unique.Tests.ps1
new file mode 100644
index 000000000..651142273
--- /dev/null
+++ b/src/pester-tests/Test-Get-Unique.Tests.ps1
@@ -0,0 +1,70 @@
+Describe "Test-Get-Unique" {
+    $sortedList1 = 1,2,2,3,3,4,5
+    It "Should be able to use the Get-Unique cmdlet without error with inputObject switch" {
+        { Get-Unique -InputObject $sortedList1 } | Should Not Throw
+    }
+
+    It "Should be able to uset the gu alias without error" {
+        { gu -InputObject $sortedList1 } | Should Not Throw
+    }
+
+    It "Should output an array" {
+        $(Get-Unique -InputObject $sortedList1).GetType().BaseType | Should Be Array
+    }
+
+    It "Should output an array of unchanged items when the InputObject switch is used" {
+        $actual   = Get-Unique -InputObject $sortedList1
+
+        $actual[0] | Should Be $sortedList1[0]
+        $actual[1] | Should Be $sortedList1[1]
+        $actual[2] | Should Be $sortedList1[2]
+        $actual[3] | Should Be $sortedList1[3]
+        $actual[4] | Should Be $sortedList1[4]
+        $actual[5] | Should Be $sortedList1[5]
+        $actual[6] | Should Be $sortedList1[6]
+
+        $actual.Length | Should Be 7
+    }
+
+    It "Should accept piped input" {
+        { $actualOutput = $sortedList1 | Get-Unique } | Should Not Throw
+    }
+
+    It "Should have the expected output when piped input is used" {
+        $actualOutput   = $sortedList1 | Get-Unique 
+        $expectedOutput = 1,2,3,4,5
+
+        $actualOutput.Length | Should Be $expectedOutput.Length
+
+        $actualOutput[0] | Should Be $expectedOutput[0]
+        $actualOutput[1] | Should Be $expectedOutput[1]
+        $actualOutput[2] | Should Be $expectedOutput[2]
+        $actualOutput[3] | Should Be $expectedOutput[3]
+        $actualOutput[4] | Should Be $expectedOutput[4]
+    }
+
+    It "Should be able to input a collection in the inputObject switch" {
+        $collection = "a", "b", "b", "d"
+        $actual     = Get-Unique -InputObject $collection
+
+        $actual.Length | Should Be $collection.Length
+
+        $actual[0] | Should Be $collection[0]
+        $actual[1] | Should Be $collection[1]
+        $actual[2] | Should Be $collection[2]
+        $actual[3] | Should Be $collection[3]
+    }
+
+    It "Should get the unique items when piped collection input is used" {
+        $collection     = "a", "b", "b", "d"
+        $expectedOutput = "a", "b", "d"
+
+        $actual = Get-Unique -InputObject $collection
+
+        $actual.Length | Should Be $collection.Length
+
+        $actual[0] | Should Be $collection[0]
+        $actual[1] | Should Be $collection[1]
+        $actual[2] | Should Be $collection[2]
+    }
+}